String.Compare 方法

定義

命名空間:: System

組件:: netstandard.dll, System.Runtime.dll

組件:: System.Runtime.dll

組件:: mscorlib.dll

組件:: netstandard.dll

組件:: mscorlib.dll, System.Runtime.dll

重要

部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。

比較兩個指定的 String 物件，並回傳一個整數，表示它們在排序順序中的相對位置。

多載

名稱	Description
Compare(String, Int32, String, Int32, Int32, CultureInfo, CompareOptions)	利用指定的比較選項與文化特定資訊比較兩個指定 String 物件的子串來影響比較，並回傳一個整數，表示兩個子串在排序順序中的關係。
Compare(String, Int32, String, Int32, Int32, Boolean, CultureInfo)	比較兩個指定 String 物件的子串，忽略或尊重其情況，並利用文化特定資訊影響比較，並回傳一個整數，表示它們在排序順序中的相對位置。
Compare(String, Int32, String, Int32, Int32, StringComparison)	利用指定規則比較兩個指定 String 物件的子字串，並回傳一個整數，表示它們在排序順序中的相對位置。
Compare(String, Int32, String, Int32, Int32, Boolean)	比較兩個指定 String 物件的子串，忽略或尊重它們的格，並回傳一個整數表示它們在排序順序中的相對位置。
Compare(String, Int32, String, Int32, Int32)	比較兩個指定 String 物件的子串，並回傳一個整數，表示它們在排序順序中的相對位置。
Compare(String, String, CultureInfo, CompareOptions)	利用指定的比較選項與文化特定資訊比較兩個指定 String 物件，影響比較結果，並回傳一個整數，顯示兩字串在排序順序中的關係。
Compare(String, String, Boolean, CultureInfo)	比較兩個指定 String 物件，忽略或尊重其情況，並利用文化特定資訊影響比較，並回傳一個整數表示它們在排序順序中的相對位置。
Compare(String, String, StringComparison)	使用指定規則比較兩個指定 String 物件，並回傳一個整數，表示它們在排序順序中的相對位置。
Compare(String, String, Boolean)	比較兩個指定 String 物件，忽略或尊重其大小，並回傳一個整數，表示它們在排序順序中的相對位置。
Compare(String, String)	比較兩個指定的 String 物件，並回傳一個整數，表示它們在排序順序中的相對位置。

備註

所有方法的 Compare 超載都會回傳一個 32 位元的有符號整數，表示兩個比較元件之間的詞法關係。

價值觀	狀況
低於零	第一個子字串在排序順序中位於第二個子字串之前。
零	子字串在排序順序中出現的位置相同，或 `length` 為零。
大於零	第一個子字串依排序順序緊接第二個子字串。

警告

如果可能，你應該呼叫包含Compare參數的方法的超載StringComparison。如需詳細資訊，請參閱使用字串的最佳做法。

Compare(String, Int32, String, Int32, Int32, CultureInfo, CompareOptions)

來源:: String.Comparison.cs

來源:: String.Comparison.cs

來源:: String.Comparison.cs

來源:: String.Comparison.cs

來源:: String.Comparison.cs

利用指定的比較選項與文化特定資訊比較兩個指定 String 物件的子串來影響比較，並回傳一個整數，表示兩個子串在排序順序中的關係。

public:
 static int Compare(System::String ^ strA, int indexA, System::String ^ strB, int indexB, int length, System::Globalization::CultureInfo ^ culture, System::Globalization::CompareOptions options);

public static int Compare(string? strA, int indexA, string? strB, int indexB, int length, System.Globalization.CultureInfo? culture, System.Globalization.CompareOptions options);

public static int Compare(string strA, int indexA, string strB, int indexB, int length, System.Globalization.CultureInfo culture, System.Globalization.CompareOptions options);

static member Compare : string * int * string * int * int * System.Globalization.CultureInfo * System.Globalization.CompareOptions -> int

Public Shared Function Compare (strA As String, indexA As Integer, strB As String, indexB As Integer, length As Integer, culture As CultureInfo, options As CompareOptions) As Integer

參數

strA: String

比較中第一個用的字串。

indexA: Int32

子串在 strA中的起始位置。

strB: String

這是第二個用來比較的弦。

indexB: Int32

子串在 strB中的起始位置。

length: Int32

子串中可比較的最大字元數。

culture: CultureInfo

提供文化特定比較資訊的物件。如果 culture 為 null，則會使用目前的文化特性。

options: CompareOptions

進行比較時可使用的選項（例如忽略大小寫或符號）。

傳回

Int32

一個整數表示兩個子串之間的詞彙關係，如下表所示。

價值	條件
低於零	子 `strA` 串在排序順序中排在子 `strB` 字串之前。
零	子字串在排序順序中出現的位置相同，或 `length` 為零。
大於零	子 `strA` 字串在子字串之後，依排序順序跟隨子 `strB` 字串。

例外狀況

ArgumentException

options 不是一個 CompareOptions 數值。

ArgumentOutOfRangeException

indexA 大於 strA.Length。

-或-

indexB 大於 strB.Length。

-或-

indexA，， indexB或 length 為負值。

-或-

或 strAstrB 或是 null，且 length 大於零。

範例

以下範例使用比較 Compare(String, Int32, String, Int32, Int32, CultureInfo, CompareOptions) 兩人姓氏的方法。接著會依字母順序列出這些資料。

string name1 = "Jack Smith";
string name2 = "John Doe";

// Get position of character after the space character.
int index1 = name1.IndexOf(" ");
index1 = index1 < 0 ? 0 : ++index1;

int index2 = name2.IndexOf(" ");
index2 = index2 < 0 ? 0 : ++index2;

int length = Math.Max(name1.Length, name2.Length);

Console.WriteLine("Sorted alphabetically by last name:");
if (String.Compare(name1, index1, name2, index2, length,
                   new CultureInfo("en-US"), CompareOptions.IgnoreCase) < 0)
    Console.WriteLine("{0}\n{1}", name1, name2);
else
    Console.WriteLine("{0}\n{1}", name2, name1);

// The example displays the following output:
//       Sorted alphabetically by last name:
//       John Doe
//       Jack Smith

open System
open System.Globalization

let name1 = "Jack Smith"
let name2 = "John Doe"

// Get position of character after the space character.
let index1 =
    let i = name1.IndexOf " "
    if i < 0 then 0 else i + 1

let index2 = 
    let i = name2.IndexOf " "
    if i < 0 then 0 else i + 1

let length = max name1.Length name2.Length

printfn "Sorted alphabetically by last name:"
if String.Compare(name1, index1, name2, index2, length, CultureInfo "en-US", CompareOptions.IgnoreCase) < 0 then
    printfn $"{name1}\n{name2}"
else
    printfn $"{name2}\n{name1}"

// The example displays the following output:
//       Sorted alphabetically by last name:
//       John Doe
//       Jack Smith

Imports System.Globalization

Module Example
   Public Sub Main()
      Dim name1 As String = "Jack Smith"
      Dim name2 = "John Doe"
      
      ' Get position of space character.
      Dim index1 As Integer = name1.IndexOf(" ")
      index1 = CInt(IIf(index1 < 0, 0, index1 - 1))
      
      Dim index2 As Integer = name2.IndexOf(" ")
      index1 = CInt(IIf(index1 < 0, 0, index1 - 1))
      
      Dim length As Integer = Math.Max(name1.Length, name2.Length)
      
      Console.WriteLIne("Sorted alphabetically by last name:")
      If String.Compare(name1, index1, name2, index2, length, _
                        New CultureInfo("en-US"), CompareOptions.IgnoreCase) < 0 Then
         Console.WriteLine("{0}{1}{2}", name1, vbCrLf, name2)
      Else
         Console.WriteLine("{0}{1}{2}", name2, vbCrLf, name1)
      End If
   End Sub
End Module
' The example displays the following output;
'       Sorted alphabetically by last name:
'       John Doe
'       Jack Smith

備註

比較的子串從位置 strAindexAstrBindexB開始，位置為。第一子串的長度即為負strA值的長度indexA。第二子串的長度即為負strBindexB值的長度。

要比較的字元數為兩個子串長度較短者， length且。這些 indexA、 indexB、和 length 參數必須為非負。

比較利用該 culture 參數取得文化特定的資訊，例如字模規則及個別字元的字母順序。例如，某個文化可以指定某些字元組合被視為單一字元，或以特定方式比較大寫與小寫字元，或字元排序取決於前後的字元。

注意事項

此 Compare(String, Int32, String, Int32, Int32, CultureInfo, CompareOptions) 方法主要設計用於排序或字母排序操作。當方法呼叫的主要目的是判斷兩個子字串是否等價（也就是說，方法呼叫的目的是測試回傳值為零時），則不應使用此方法。要判斷兩個字串是否等價，請呼叫該 Equals 方法。

其中一個或兩個可以strAstrB是 null。根據定義，任何字串（包括 String.Empty）都比大於空參考，而兩個空參考則比較相等。

比較還可以由 options 參數來指定，該參數包含列舉中的一個或多個成員 System.Globalization.CompareOptions 。然而，由於此方法的目的是進行培養敏感的弦比較，與CompareOptions.Ordinal CompareOptions.OrdinalIgnoreCase值對此不影響。

當發現不等式或兩個子串都被比較時，比較即告終止。然而，如果兩串的比較結果等於其中一串的末端，而另一串字串還有字元，則剩餘字元的字串被視為較大。回傳值是最後一次比較的結果。

給呼叫者的注意事項

字元集包含可忽略的字元。 Compare(String, Int32, String, Int32, Int32, CultureInfo, CompareOptions)該方法在進行語言或文化敏感比較時，並未考慮這些字元。要辨識比較中可忽略的字元，請為參數提供 Ordinal 或 OrdinalIgnoreCaseoptions 值。

另請參閱

Equals

適用於

Compare(String, Int32, String, Int32, Int32, Boolean, CultureInfo)

來源:: String.Comparison.cs

來源:: String.Comparison.cs

來源:: String.Comparison.cs

來源:: String.Comparison.cs

來源:: String.Comparison.cs

比較兩個指定 String 物件的子串，忽略或尊重其情況，並利用文化特定資訊影響比較，並回傳一個整數，表示它們在排序順序中的相對位置。

public:
 static int Compare(System::String ^ strA, int indexA, System::String ^ strB, int indexB, int length, bool ignoreCase, System::Globalization::CultureInfo ^ culture);

public static int Compare(string? strA, int indexA, string? strB, int indexB, int length, bool ignoreCase, System.Globalization.CultureInfo? culture);

public static int Compare(string strA, int indexA, string strB, int indexB, int length, bool ignoreCase, System.Globalization.CultureInfo culture);

static member Compare : string * int * string * int * int * bool * System.Globalization.CultureInfo -> int

Public Shared Function Compare (strA As String, indexA As Integer, strB As String, indexB As Integer, length As Integer, ignoreCase As Boolean, culture As CultureInfo) As Integer

參數

strA: String

比較中第一個用的字串。

indexA: Int32

子字串在 strA中的位置。

strB: String

這是第二個用來比較的弦。

indexB: Int32

子字串在 strB中的位置。

length: Int32

子串中可比較的最大字元數。

ignoreCase: Boolean

true在比較時忽略格;否則，。 false

culture: CultureInfo

提供文化特定比較資訊的物件。如果 culture 為 null，則會使用目前的文化特性。

傳回

Int32

一個整數表示兩個比較物之間的詞彙關係。

價值	條件
低於零	子 `strA` 串在排序順序中排在子 `strB` 字串之前。
零	子字串在排序順序中出現的位置相同，或 `length` 為零。
大於零	子 `strA` 字串在子字串之後，依排序順序跟隨子 `strB` 字串。

例外狀況

ArgumentOutOfRangeException

indexA大於strA......Length

-或-

indexB大於strB......Length

-或-

indexA，， indexB或 length 為負值。

-或-

或 strAstrB 或是 null，且 length 大於零。

範例

以下範例比較兩個使用不同文化的子字串，並忽略子字串的情況。文化的選擇會影響字母「I」的比較方式。

// Sample for String.Compare(String, Int32, String, Int32, Int32, Boolean, CultureInfo)
using System;
using System.Globalization;

class Sample5
{
    public static void Main()
    {
        //                 0123456
        String str1 = "MACHINE";
        String str2 = "machine";
        String str;
        int result;

        Console.WriteLine();
        Console.WriteLine("str1 = '{0}', str2 = '{1}'", str1, str2);
        Console.WriteLine("Ignore case, Turkish culture:");
        result = String.Compare(str1, 4, str2, 4, 2, true, new CultureInfo("tr-TR"));
        str = ((result < 0) ? "less than" : ((result > 0) ? "greater than" : "equal to"));
        Console.Write("Substring '{0}' in '{1}' is ", str1.Substring(4, 2), str1);
        Console.Write("{0} ", str);
        Console.WriteLine("substring '{0}' in '{1}'.", str2.Substring(4, 2), str2);

        Console.WriteLine();
        Console.WriteLine("Ignore case, invariant culture:");
        result = String.Compare(str1, 4, str2, 4, 2, true, CultureInfo.InvariantCulture);
        str = ((result < 0) ? "less than" : ((result > 0) ? "greater than" : "equal to"));
        Console.Write("Substring '{0}' in '{1}' is ", str1.Substring(4, 2), str1);
        Console.Write("{0} ", str);
        Console.WriteLine("substring '{0}' in '{1}'.", str2.Substring(4, 2), str2);
    }
}
/*
This example produces the following results:

str1 = 'MACHINE', str2 = 'machine'
Ignore case, Turkish culture:
Substring 'IN' in 'MACHINE' is less than substring 'in' in 'machine'.

Ignore case, invariant culture:
Substring 'IN' in 'MACHINE' is equal to substring 'in' in 'machine'.
*/

// Sample for String.Compare(String, Int32, String, Int32, Int32, Boolean, CultureInfo)
open System
open System.Globalization

//                 0123456
let str1 = "MACHINE"
let str2 = "machine"

printfn $"\nstr1 = '{str1}', str2 = '{str2}'"
printfn "Ignore case, Turkish culture:"
let result = String.Compare(str1, 4, str2, 4, 2, true, CultureInfo "tr-TR")
let str = if result < 0 then "less than" elif result > 0 then "greater than" else "equal to"
printf $"Substring '{str1.Substring(4, 2)}' in '{str1}' is "
printf $"{str} "
printfn $"substring '{str2.Substring(4, 2)}' in '{str2}'."

printfn "\nIgnore case, invariant culture:"
let result2 = String.Compare(str1, 4, str2, 4, 2, true, CultureInfo.InvariantCulture)
let str3 = if result < 0 then "less than" elif result > 0 then "greater than" else "equal to"
printf $"Substring '{str1.Substring(4, 2)}' in '{str1}' is "
printf $"{str3} "
printfn $"substring '{str2.Substring(4, 2)}' in '{str2}'."

(*
This example produces the following results:

str1 = 'MACHINE', str2 = 'machine'
Ignore case, Turkish culture:
Substring 'IN' in 'MACHINE' is less than substring 'in' in 'machine'.

Ignore case, invariant culture:
Substring 'IN' in 'MACHINE' is equal to substring 'in' in 'machine'.
*)

' Sample for String.Compare(String, Int32, String, Int32, Int32, Boolean, CultureInfo)
Imports System.Globalization

Class Sample
   
   Public Shared Sub Main()
      '                       0123456
      Dim str1 As [String] = "MACHINE"
      Dim str2 As [String] = "machine"
      Dim str As [String]
      Dim result As Integer
      
      Console.WriteLine()
      Console.WriteLine("str1 = '{0}', str2 = '{1}'", str1, str2)
      Console.WriteLine("Ignore case, Turkish culture:")
      result = [String].Compare(str1, 4, str2, 4, 2, True, New CultureInfo("tr-TR"))
      str = IIf(result < 0, "less than", IIf(result > 0, "greater than", "equal to"))
      Console.Write("Substring '{0}' in '{1}' is ", str1.Substring(4, 2), str1)
      Console.Write("{0} ", str)
      Console.WriteLine("substring '{0}' in '{1}'.", str2.Substring(4, 2), str2)
      
      Console.WriteLine()
      Console.WriteLine("Ignore case, invariant culture:")
      result = [String].Compare(str1, 4, str2, 4, 2, True, CultureInfo.InvariantCulture)
      str = IIf(result < 0, "less than", IIf(result > 0, "greater than", "equal to"))
      Console.Write("Substring '{0}' in '{1}' is ", str1.Substring(4, 2), str1)
      Console.Write("{0} ", str)
      Console.WriteLine("substring '{0}' in '{1}'.", str2.Substring(4, 2), str2)
   End Sub
End Class
'
'This example produces the following results:
'
'str1 = 'MACHINE', str2 = 'machine'
'Ignore case, Turkish culture:
'Substring 'IN' in 'MACHINE' is less than substring 'in' in 'machine'.
'
'Ignore case, invariant culture:
'Substring 'IN' in 'MACHINE' is equal to substring 'in' in 'machine'.
'

備註

比較的子串從開始strAindexA於，在 strBindexB。和 indexA 都是indexB零基底;也就是說，和 strA 中的strB第一個字元位於位置零，而非位置一。第一子串的長度等於負strA一的長度indexA。第二子串的長度等於負strBindexB一的長度。

要比較的字元數為兩個子串長度較短者， length且。這些 indexA、 indexB、和 length 參數必須為非負。

比較利用該 culture 參數取得文化特定的資訊，如字模規則及個別字元的字母順序。例如，文化可以指定某些字元組合視為單一字元，或以特定方式比較大寫與小寫字元，或字元排序順序取決於前後的字元。

比較是使用單字排序規則進行的。關於字、字串和序數排序的更多資訊，請參見 System.Globalization.CompareOptions。

其中一個或兩個比較可以是 null。根據定義，任何字串，包括空字串（“”），都比空參考大於空參考;而兩個空參考則彼此比較為相等。

當發現不等式或兩個子串都被比較時，比較即告終止。然而，如果兩串的比較結果等於一個字串的末端，而另一串字串還有字元，則剩餘字元的字串被視為較大。回傳值是最後一次比較的結果。

當比較受培養物特定套管規則影響時，可能會產生意想不到的結果。例如，在土耳其語中，以下範例會得到錯誤的結果，因為土耳其語的檔案系統並未對「file」中的字母「i」使用語言大小寫規則。

static bool IsFileURI(String path)
{
    return (String.Compare(path, 0, "file:", 0, 5, true) == 0);
}

let isFileURI path =
    String.Compare(path, 0, "file:", 0, 5, true) = 0

Shared Function IsFileURI(ByVal path As String) As Boolean
    If String.Compare(path, 0, "file:", 0, 5, True) = 0 Then
        Return True
    Else
        Return False
    End If
End Function

用序數比較將路徑名稱與「檔案」進行比較。正確的程式碼如下：

static bool IsFileURI(String path)
{
    return (String.Compare(path, 0, "file:", 0, 5, StringComparison.OrdinalIgnoreCase) == 0);
}

let isFileURI path =
    String.Compare(path, 0, "file:", 0, 5, StringComparison.OrdinalIgnoreCase) = 0

Shared Function IsFileURI(ByVal path As String) As Boolean
    If String.Compare(path, 0, "file:", 0, 5, StringComparison.OrdinalIgnoreCase) = 0 Then
        Return True
    Else
        Return False
    End If
End Function

給呼叫者的注意事項

字元集包含可忽略的字元。 Compare(String, Int32, String, Int32, Int32, Boolean, CultureInfo)該方法在進行語言或文化敏感比較時，並未考慮這些字元。要辨識比較中可忽略的字元，呼叫該 Compare(String, Int32, String, Int32, Int32, CultureInfo, CompareOptions) 方法並為參數提供 Ordinal 或 OrdinalIgnoreCaseoptions 值。

另請參閱

適用於

Compare(String, Int32, String, Int32, Int32, StringComparison)

來源:: String.Comparison.cs

來源:: String.Comparison.cs

來源:: String.Comparison.cs

來源:: String.Comparison.cs

來源:: String.Comparison.cs

利用指定規則比較兩個指定 String 物件的子字串，並回傳一個整數，表示它們在排序順序中的相對位置。

public:
 static int Compare(System::String ^ strA, int indexA, System::String ^ strB, int indexB, int length, StringComparison comparisonType);

public static int Compare(string strA, int indexA, string strB, int indexB, int length, StringComparison comparisonType);

public static int Compare(string? strA, int indexA, string? strB, int indexB, int length, StringComparison comparisonType);

static member Compare : string * int * string * int * int * StringComparison -> int

Public Shared Function Compare (strA As String, indexA As Integer, strB As String, indexB As Integer, length As Integer, comparisonType As StringComparison) As Integer

參數

strA: String

比較中第一個用的字串。

indexA: Int32

子字串在 strA中的位置。

strB: String

這是第二個用來比較的弦。

indexB: Int32

子字串在 strB中的位置。

length: Int32

子串中可比較的最大字元數。

comparisonType: StringComparison

其中一個列舉值，用來指定比較時要使用的規則。

傳回

Int32

一個32位元帶符號的整數，表示兩個比較元之間的詞彙關係。

價值	條件
低於零	子 `strA` 串在排序順序中排在子 `strB` 字串之前。
零	子串在排序順序中出現在同一位置，或參數 `length` 為零。
大於零	子 `strA` 字串在子字串之後，依排序順序跟隨子 `strB` 字串。

例外狀況

ArgumentOutOfRangeException

indexA大於strA......Length

-或-

indexB大於strB......Length

-或-

indexA，， indexB或 length 為負值。

-或-

或 indexAindexB 或是 null，且 length 大於零。

ArgumentException

comparisonType 不是一個 StringComparison 數值。

範例

以下範例比較兩個子字串。

String str1 = "machine";
String str2 = "device";
String str;
int result;

Console.WriteLine();
Console.WriteLine("str1 = '{0}', str2 = '{1}'", str1, str2);
result = String.Compare(str1, 2, str2, 0, 2);
str = ((result < 0) ? "less than" : ((result > 0) ? "greater than" : "equal to"));
Console.Write("Substring '{0}' in '{1}' is ", str1.Substring(2, 2), str1);
Console.Write("{0} ", str);
Console.WriteLine("substring '{0}' in '{1}'.", str2.Substring(0, 2), str2);

/*
This example produces the following results:

str1 = 'machine', str2 = 'device'
Substring 'ch' in 'machine' is less than substring 'de' in 'device'.
*/

open System

let str1 = "machine"
let str2 = "device"

printfn "\nstr1 = '{str1}', str2 = '{str2}'"

let result = String.Compare(str1, 2, str2, 0, 2)
let str = 
    if result < 0 then "less than" 
    elif result > 0 then "greater than" 
    else "equal to"

printf $"Substring '{str1.Substring(2, 2)}' in '{str1}' is "
printf $"{str} "
printfn $"substring '{str2.Substring(0, 2)}' in '{str2}'."

(*
This example produces the following results:

str1 = 'machine', str2 = 'device'
Substring 'ch' in 'machine' is less than substring 'de' in 'device'.
*)

' Sample for String.Compare(String, Int32, String, Int32, Int32)
Class Sample
   Public Shared Sub Main()
      '                       0123456
      Dim str1 As [String] = "machine"
      Dim str2 As [String] = "device"
      Dim str As [String]
      Dim result As Integer
      
      Console.WriteLine()
      Console.WriteLine("str1 = '{0}', str2 = '{1}'", str1, str2)
      result = [String].Compare(str1, 2, str2, 0, 2)
      str = IIf(result < 0, "less than", IIf(result > 0, "greater than", "equal to"))
      Console.Write("Substring '{0}' in '{1}' is ", str1.Substring(2, 2), str1)
      Console.Write("{0} ", str)
      Console.WriteLine("substring '{0}' in '{1}'.", str2.Substring(0, 2), str2)
   End Sub
End Class
'
'This example produces the following results:
'
'str1 = 'machine', str2 = 'device'
'Substring 'ch' in 'machine' is less than substring 'de' in 'device'.
'

備註

比較的子串從中strAindexA開始，strBindexB在中。和 indexA 都是indexB零基底;也就是說，和 strA 中的strB第一個字元位於位置零，而非位置一。第一子串的長度等於負strA一的長度indexA。第二子串的長度等於負strBindexB一的長度。

要比較的字元數為兩個子串長度較短者， length且。這些 indexA、 indexB、和 length 參數必須為非負。

參數 comparisonType 指示比較是否應使用當前或不變的文化，採用或忽略比較的案例，或使用詞彙（文化敏感）或序數（文化敏感）排序規則。

其中一個或兩個比較可以是 null。根據定義，任何字串，包括空字串（“”），都比空參考大於空參考;而兩個空參考則彼此比較為相等。

static bool IsFileURI(String path)
{
    return (String.Compare(path, 0, "file:", 0, 5, true) == 0);
}

let isFileURI path =
    String.Compare(path, 0, "file:", 0, 5, true) = 0

Shared Function IsFileURI(ByVal path As String) As Boolean
    If String.Compare(path, 0, "file:", 0, 5, True) = 0 Then
        Return True
    Else
        Return False
    End If
End Function

用序數比較將路徑名稱與「檔案」進行比較。正確的程式碼如下：

static bool IsFileURI(String path)
{
    return (String.Compare(path, 0, "file:", 0, 5, StringComparison.OrdinalIgnoreCase) == 0);
}

let isFileURI path =
    String.Compare(path, 0, "file:", 0, 5, StringComparison.OrdinalIgnoreCase) = 0

Shared Function IsFileURI(ByVal path As String) As Boolean
    If String.Compare(path, 0, "file:", 0, 5, StringComparison.OrdinalIgnoreCase) = 0 Then
        Return True
    Else
        Return False
    End If
End Function

給呼叫者的注意事項

字元集包含可忽略的字元。 Compare(String, Int32, String, Int32, Int32, StringComparison)該方法在進行語言或文化敏感比較時，並未考慮這些字元。要辨識比較中可忽略的字元，請為參數提供 Ordinal 或 OrdinalIgnoreCasecomparisonType 值。

另請參閱

適用於

Compare(String, Int32, String, Int32, Int32, Boolean)

來源:: String.Comparison.cs

來源:: String.Comparison.cs

來源:: String.Comparison.cs

來源:: String.Comparison.cs

來源:: String.Comparison.cs

比較兩個指定 String 物件的子串，忽略或尊重它們的格，並回傳一個整數表示它們在排序順序中的相對位置。

public:
 static int Compare(System::String ^ strA, int indexA, System::String ^ strB, int indexB, int length, bool ignoreCase);

public static int Compare(string? strA, int indexA, string? strB, int indexB, int length, bool ignoreCase);

public static int Compare(string strA, int indexA, string strB, int indexB, int length, bool ignoreCase);

static member Compare : string * int * string * int * int * bool -> int

Public Shared Function Compare (strA As String, indexA As Integer, strB As String, indexB As Integer, length As Integer, ignoreCase As Boolean) As Integer

參數

strA: String

比較中第一個用的字串。

indexA: Int32

子字串在 strA中的位置。

strB: String

這是第二個用來比較的弦。

indexB: Int32

子字串在 strB中的位置。

length: Int32

子串中可比較的最大字元數。

ignoreCase: Boolean

true在比較時忽略格;否則，。 false

傳回

Int32

一個32位元帶符號的整數，表示兩個比較元之間的詞彙關係。

價值	條件
低於零	子 `strA` 串在排序順序中排在子 `strB` 字串之前。
零	子字串在排序順序中出現的位置相同，或 `length` 為零。
大於零	子 `strA` 字串在子字串之後，依排序順序跟隨子 `strB` 字串。

例外狀況

ArgumentOutOfRangeException

indexA大於strA......Length

-或-

indexB大於strB......Length

-或-

indexA，， indexB或 length 為負值。

-或-

或 indexAindexB 或是 null，且 length 大於零。

範例

以下範例對兩個子串進行兩次比較，僅在情況下有所不同。第一個比較忽略了案例，第二個比較則考慮案例。

String str1 = "MACHINE";
String str2 = "machine";
String str;
int result;

Console.WriteLine();
Console.WriteLine("str1 = '{0}', str2 = '{1}'", str1, str2);

Console.WriteLine("Ignore case:");
result = String.Compare(str1, 2, str2, 2, 2, true);
str = ((result < 0) ? "less than" : ((result > 0) ? "greater than" : "equal to"));
Console.Write("Substring '{0}' in '{1}' is ", str1.Substring(2, 2), str1);
Console.Write("{0} ", str);
Console.WriteLine("substring '{0}' in '{1}'.", str2.Substring(2, 2), str2);
Console.WriteLine();

Console.WriteLine("Honor case:");
result = String.Compare(str1, 2, str2, 2, 2, false);
str = ((result < 0) ? "less than" : ((result > 0) ? "greater than" : "equal to"));
Console.Write("Substring '{0}' in '{1}' is ", str1.Substring(2, 2), str1);
Console.Write("{0} ", str);
Console.WriteLine("substring '{0}' in '{1}'.", str2.Substring(2, 2), str2);

/*
This example produces the following results:

str1 = 'MACHINE', str2 = 'machine'
Ignore case:
Substring 'CH' in 'MACHINE' is equal to substring 'ch' in 'machine'.

Honor case:
Substring 'CH' in 'MACHINE' is greater than substring 'ch' in 'machine'.
*/

open System

let str1 = "MACHINE"
let str2 = "machine"

printfn $"\nstr1 = '{str1}', str2 = '{str2}'"

printfn "Ignore case:"
let result = String.Compare(str1, 2, str2, 2, 2, true)
let str = 
    if result < 0 then "less than" 
    elif result > 0 then "greater than"
    else "equal to"

printf $"Substring '{str1.Substring(2, 2)}' in '{str1}' is "
printf $"{str} "
printfn $"substring '{str2.Substring(2, 2)}' in '{str2}'.\n"

printfn "Honor case:"
let result2 = String.Compare(str1, 2, str2, 2, 2, false)
let str3 = 
    if result < 0 then "less than" 
    elif result > 0 then "greater than" 
    else "equal to"

printfn $"Substring '{str1.Substring(2, 2)}' in '{str1}' is "
printf $"{str3} "
printfn $"substring '{str2.Substring(2, 2)}' in '{str2}'."

(*
This example produces the following results:

str1 = 'MACHINE', str2 = 'machine'
Ignore case:
Substring 'CH' in 'MACHINE' is equal to substring 'ch' in 'machine'.

Honor case:
Substring 'CH' in 'MACHINE' is greater than substring 'ch' in 'machine'.
*)

' Sample for String.Compare(String, Int32, String, Int32, Int32, Boolean)
Class Sample
   
   Public Shared Sub Main()
      '                       0123456
      Dim str1 As [String] = "MACHINE"
      Dim str2 As [String] = "machine"
      Dim str As [String]
      Dim result As Integer
      
      Console.WriteLine()
      Console.WriteLine("str1 = '{0}', str2 = '{1}'", str1, str2)
      Console.WriteLine("Ignore case:")
      result = [String].Compare(str1, 2, str2, 2, 2, True)
      str = IIf(result < 0, "less than", IIf(result > 0, "greater than", "equal to"))
      Console.Write("Substring '{0}' in '{1}' is ", str1.Substring(2, 2), str1)
      Console.Write("{0} ", str)
      Console.WriteLine("substring '{0}' in '{1}'.", str2.Substring(2, 2), str2)
      
      Console.WriteLine()
      Console.WriteLine("Honor case:")
      result = [String].Compare(str1, 2, str2, 2, 2, False)
      str = IIf(result < 0, "less than", IIf(result > 0, "greater than", "equal to"))
      Console.Write("Substring '{0}' in '{1}' is ", str1.Substring(2, 2), str1)
      Console.Write("{0} ", str)
      Console.WriteLine("substring '{0}' in '{1}'.", str2.Substring(2, 2), str2)
   End Sub
End Class
'
'This example produces the following results:
'
'str1 = 'MACHINE', str2 = 'machine'
'Ignore case:
'Substring 'CH' in 'MACHINE' is equal to substring 'ch' in 'machine'.
'
'Honor case:
'Substring 'CH' in 'MACHINE' is greater than substring 'ch' in 'machine'.
'

備註

比較的子串從開始strAindexA於，在 strBindexB。和 indexA 都是indexB零基底;也就是說，和 strA 中的strB第一個字元位於位置零。第一子串的長度等於負strA一的長度indexA。第二子串的長度等於負strBindexB一的長度。

要比較的字元數為兩個子串長度較短者， length且。這些 indexA、 indexB、和 length 參數必須為非負。

比較利用當前文化獲取特定文化資訊，如字模規則及個別字元的字母順序。例如，文化可以指定某些字元組合視為單一字元，或以特定方式比較大寫與小寫字元，或字元排序順序取決於前後的字元。

比較是使用單字排序規則進行的。關於字、字串和序數排序的更多資訊，請參見 System.Globalization.CompareOptions。

警告

在比較字串時，你應該呼叫該 Compare(String, Int32, String, Int32, Int32, StringComparison) 方法，這需要你明確指定該方法所使用的字串比較類型。如需詳細資訊，請參閱使用字串的最佳做法。

其中一個或兩個比較可以是 null。根據定義，任何字串，包括空字串（“”），都比空參考大於空參考;而兩個空參考則彼此比較為相等。

static bool IsFileURI(String path)
{
    return (String.Compare(path, 0, "file:", 0, 5, true) == 0);
}

let isFileURI path =
    String.Compare(path, 0, "file:", 0, 5, true) = 0

Shared Function IsFileURI(ByVal path As String) As Boolean
    If String.Compare(path, 0, "file:", 0, 5, True) = 0 Then
        Return True
    Else
        Return False
    End If
End Function

路徑名稱需要以不變方式比較。正確的程式碼如下。

static bool IsFileURI(String path)
{
    return (String.Compare(path, 0, "file:", 0, 5, StringComparison.OrdinalIgnoreCase) == 0);
}

let isFileURI path =
    String.Compare(path, 0, "file:", 0, 5, StringComparison.OrdinalIgnoreCase) = 0

Shared Function IsFileURI(ByVal path As String) As Boolean
    If String.Compare(path, 0, "file:", 0, 5, StringComparison.OrdinalIgnoreCase) = 0 Then
        Return True
    Else
        Return False
    End If
End Function

給呼叫者的注意事項

字元集包含可忽略的字元。 Compare(String, Int32, String, Int32, Int32, Boolean)該方法在進行語言或文化敏感比較時，並未考慮這些字元。要辨識比較中可忽略的字元，呼叫該 Compare(String, Int32, String, Int32, Int32, StringComparison) 方法並為參數提供 Ordinal 或 OrdinalIgnoreCasecomparisonType 值。

另請參閱

適用於

Compare(String, Int32, String, Int32, Int32)

來源:: String.Comparison.cs

來源:: String.Comparison.cs

來源:: String.Comparison.cs

來源:: String.Comparison.cs

來源:: String.Comparison.cs

比較兩個指定 String 物件的子串，並回傳一個整數，表示它們在排序順序中的相對位置。

public:
 static int Compare(System::String ^ strA, int indexA, System::String ^ strB, int indexB, int length);

public static int Compare(string strA, int indexA, string strB, int indexB, int length);

public static int Compare(string? strA, int indexA, string? strB, int indexB, int length);

static member Compare : string * int * string * int * int -> int

Public Shared Function Compare (strA As String, indexA As Integer, strB As String, indexB As Integer, length As Integer) As Integer

參數

strA: String

比較中第一個用的字串。

indexA: Int32

子字串在 strA中的位置。

strB: String

這是第二個用來比較的弦。

indexB: Int32

子字串在 strB中的位置。

length: Int32

子串中可比較的最大字元數。

傳回

Int32

一個 32 位元的有號整數，表示兩個比較元件之間的詞彙關係。

價值	條件
低於零	子 `strA` 串在排序順序中排在子 `strB` 字串之前。
零	子字串在排序順序中出現的位置相同，或 `length` 為零。
大於零	子 `strA` 字串在子字串之後，依排序順序跟隨子 `strB` 字串。

例外狀況

ArgumentOutOfRangeException

indexA大於strA......Length

-或-

indexB大於strB......Length

-或-

indexA，， indexB或 length 為負值。

-或-

或 indexAindexB 或是 null，且 length 大於零。

範例

以下範例比較兩個子字串。

String str1 = "machine";
String str2 = "device";
String str;
int result;

Console.WriteLine();
Console.WriteLine("str1 = '{0}', str2 = '{1}'", str1, str2);
result = String.Compare(str1, 2, str2, 0, 2);
str = ((result < 0) ? "less than" : ((result > 0) ? "greater than" : "equal to"));
Console.Write("Substring '{0}' in '{1}' is ", str1.Substring(2, 2), str1);
Console.Write("{0} ", str);
Console.WriteLine("substring '{0}' in '{1}'.", str2.Substring(0, 2), str2);

/*
This example produces the following results:

str1 = 'machine', str2 = 'device'
Substring 'ch' in 'machine' is less than substring 'de' in 'device'.
*/

open System

let str1 = "machine"
let str2 = "device"

printfn "\nstr1 = '{str1}', str2 = '{str2}'"

let result = String.Compare(str1, 2, str2, 0, 2)
let str = 
    if result < 0 then "less than" 
    elif result > 0 then "greater than" 
    else "equal to"

printf $"Substring '{str1.Substring(2, 2)}' in '{str1}' is "
printf $"{str} "
printfn $"substring '{str2.Substring(0, 2)}' in '{str2}'."

(*
This example produces the following results:

str1 = 'machine', str2 = 'device'
Substring 'ch' in 'machine' is less than substring 'de' in 'device'.
*)

' Sample for String.Compare(String, Int32, String, Int32, Int32)
Class Sample
   Public Shared Sub Main()
      '                       0123456
      Dim str1 As [String] = "machine"
      Dim str2 As [String] = "device"
      Dim str As [String]
      Dim result As Integer
      
      Console.WriteLine()
      Console.WriteLine("str1 = '{0}', str2 = '{1}'", str1, str2)
      result = [String].Compare(str1, 2, str2, 0, 2)
      str = IIf(result < 0, "less than", IIf(result > 0, "greater than", "equal to"))
      Console.Write("Substring '{0}' in '{1}' is ", str1.Substring(2, 2), str1)
      Console.Write("{0} ", str)
      Console.WriteLine("substring '{0}' in '{1}'.", str2.Substring(0, 2), str2)
   End Sub
End Class
'
'This example produces the following results:
'
'str1 = 'machine', str2 = 'device'
'Substring 'ch' in 'machine' is less than substring 'de' in 'device'.
'

備註

比較的子串從中strAindexA開始，strBindexB在中。和 indexA 都是indexB零基底;也就是說，和 strA 中的strB第一個字元位於位置零。第一子串的長度等於負strA一的長度indexA。第二子串的長度等於負strBindexB一的長度。

要比較的字元數為兩個子串長度較短者， length且。這些 indexA、 indexB、和 length 參數必須為非負。

比較是使用單字排序規則進行的。關於字、字串和序數排序的更多資訊，請參見 System.Globalization.CompareOptions。

警告

其中一個或兩個比較可以是 null。根據定義，任何字串，包括空字串（“”），都比空參考大於空參考;而兩個空參考則彼此比較為相等。

static bool IsFileURI(String path)
{
    return (String.Compare(path, 0, "file:", 0, 5, true) == 0);
}

let isFileURI path =
    String.Compare(path, 0, "file:", 0, 5, true) = 0

Shared Function IsFileURI(ByVal path As String) As Boolean
    If String.Compare(path, 0, "file:", 0, 5, True) = 0 Then
        Return True
    Else
        Return False
    End If
End Function

用序數比較將路徑名稱與「檔案」進行比較。正確的程式碼如下：

static bool IsFileURI(String path)
{
    return (String.Compare(path, 0, "file:", 0, 5, StringComparison.OrdinalIgnoreCase) == 0);
}

let isFileURI path =
    String.Compare(path, 0, "file:", 0, 5, StringComparison.OrdinalIgnoreCase) = 0

Shared Function IsFileURI(ByVal path As String) As Boolean
    If String.Compare(path, 0, "file:", 0, 5, StringComparison.OrdinalIgnoreCase) = 0 Then
        Return True
    Else
        Return False
    End If
End Function

給呼叫者的注意事項

字元集包含可忽略的字元。 Compare(String, Int32, String, Int32, Int32)該方法在進行語言或文化敏感比較時，並未考慮這些字元。要辨識比較中可忽略的字元，呼叫該 Compare(String, Int32, String, Int32, Int32, StringComparison) 方法並為參數提供 Ordinal 或 OrdinalIgnoreCasecomparisonType 值。

另請參閱

適用於

Compare(String, String, CultureInfo, CompareOptions)

來源:: String.Comparison.cs

來源:: String.Comparison.cs

來源:: String.Comparison.cs

來源:: String.Comparison.cs

來源:: String.Comparison.cs

利用指定的比較選項與文化特定資訊比較兩個指定 String 物件，影響比較結果，並回傳一個整數，顯示兩字串在排序順序中的關係。

public:
 static int Compare(System::String ^ strA, System::String ^ strB, System::Globalization::CultureInfo ^ culture, System::Globalization::CompareOptions options);

public static int Compare(string? strA, string? strB, System.Globalization.CultureInfo? culture, System.Globalization.CompareOptions options);

public static int Compare(string strA, string strB, System.Globalization.CultureInfo culture, System.Globalization.CompareOptions options);

static member Compare : string * string * System.Globalization.CultureInfo * System.Globalization.CompareOptions -> int

Public Shared Function Compare (strA As String, strB As String, culture As CultureInfo, options As CompareOptions) As Integer

參數

strA: String

要比較的第一個字串。

strB: String

要比較的第二個字串。

culture: CultureInfo

提供特定文化比較資訊的文化。如果 culture 為 null，則會使用目前的文化特性。

options: CompareOptions

進行比較時可使用的選項（例如忽略大小寫或符號）。

傳回

Int32

一個32位元有符號整數，表示與 strA之間的strB詞彙關係，如下表所示

價值	條件
低於零	`strA`依排序順序排列。`strB`
零	`strA`與排序順序相同。`strB`
大於零	`strA` 依排序順序跟隨 `strB` 。

例外狀況

ArgumentException

options 不是一個 CompareOptions 數值。

範例

以下範例以三種不同方式比較兩個字串：使用語言比較來描述 en-US 文化;en-US 文化使用語言格敏感比較;並使用序數比較。它說明了三種比較方法如何產生三種不同的結果。

using System;
using System.Globalization;

public class Example0
{
    public static void Main()
    {
        string string1 = "brother";
        string string2 = "Brother";
        string relation;
        int result;

        // Cultural (linguistic) comparison.
        result = String.Compare(string1, string2, new CultureInfo("en-US"), 
                              CompareOptions.None);
        if (result > 0)
            relation = "comes after";
        else if (result == 0)
            relation = "is the same as";
        else
            relation = "comes before";

        Console.WriteLine("'{0}' {1} '{2}'.", 
                        string1, relation, string2);

        // Cultural (linguistic) case-insensitive comparison.
        result = String.Compare(string1, string2, new CultureInfo("en-US"), 
                              CompareOptions.IgnoreCase);
        if (result > 0)
            relation = "comes after";
        else if (result == 0)
            relation = "is the same as";
        else
            relation = "comes before";

        Console.WriteLine("'{0}' {1} '{2}'.", 
                        string1, relation, string2);
 
        // Culture-insensitive ordinal comparison.
        result = String.CompareOrdinal(string1, string2);
        if (result > 0)
            relation = "comes after";
        else if (result == 0)
            relation = "is the same as";
        else
            relation = "comes before";

        Console.WriteLine("'{0}' {1} '{2}'.", 
                        string1, relation, string2);

        // The example produces the following output:
        //    'brother' comes before 'Brother'.   
        //    'brother' is the same as 'Brother'.
        //    'brother' comes after 'Brother'.
    }
}

open System
open System.Globalization

let string1 = "brother"
let string2 = "Brother"

// Cultural (linguistic) comparison.
let result = String.Compare(string1, string2, CultureInfo "en-US", CompareOptions.None)
let relation =
    if result > 0 then "comes after"
    elif result = 0 then "is the same as"
    else "comes before"

printfn $"'{string1}' {relation} '{string2}'."

// Cultural (linguistic) case-insensitive comparison.
let result2 = String.Compare(string1, string2, CultureInfo "en-US", CompareOptions.IgnoreCase)
let relation2 =
    if result2 > 0 then "comes after"
    elif result2 = 0 then "is the same as"
    else "comes before"

printfn $"'{string1}' {relation2} '{string2}'."

// Culture-insensitive ordinal comparison.
let result3 = String.CompareOrdinal(string1, string2)
let relation3 =
    if result2 > 0 then "comes after"
    elif result2 = 0 then "is the same as"
    else "comes before"

printfn $"'{string1}' {relation} '{string2}'."

// The example produces the following output:
//    'brother' comes before 'Brother'.   
//    'brother' is the same as 'Brother'.
//    'brother' comes after 'Brother'.

Imports System.Globalization

Public Module Example
   Public Sub Main()
      Dim string1 As String = "brother"
      Dim string2 As String = "Brother"
      Dim relation As String
      Dim result As Integer

      ' Cultural (linguistic) comparison.
      result = String.Compare(string1, string2, _
                              New CultureInfo("en-US"), CompareOptions.None)
      If result > 0 Then
         relation = "comes after"
      ElseIf result = 0 Then
         relation = "is the same as"
      Else
         relation = "comes before"
      End If
      Console.WriteLine("'{0}' {1} '{2}'.", string1, relation, string2)

      ' Cultural (linguistic) case-insensitive comparison.
      result = String.Compare(string1, string2, _
                              New CultureInfo("en-US"), CompareOptions.IgnoreCase)
      If result > 0 Then
         relation = "comes after"
      ElseIf result = 0 Then
         relation = "is the same as"
      Else
         relation = "comes before"
      End If
      Console.WriteLine("'{0}' {1} '{2}'.", string1, relation, string2)

      ' Culture-insensitive ordinal comparison.
      result = String.CompareOrdinal(string1, string2)
      If result > 0 Then
         relation = "comes after"
      ElseIf result = 0 Then
         relation = "is the same as"
      Else
         relation = "comes before"
      End If
      Console.WriteLine("'{0}' {1} '{2}'.", string1, relation, string2)
   End Sub
End Module
' The example produces the following output:
'    'brother' comes before 'Brother'.   
'    'brother' is the same as 'Brother'.
'    'brother' comes after 'Brother'.

備註

注意事項

此 Compare(String, String, CultureInfo, CompareOptions) 方法主要設計用於排序或字母排序操作。當方法呼叫的主要目的是判斷兩個字串是否等價（也就是為了測試回傳值為零）時，不應使用此方法。要判斷兩個字串是否等價，請呼叫該 Equals 方法。

比較還可以由 options 參數來指定，該參數包含列舉中的一個或多個成員 CompareOptions 。然而，由於此方法的目的是進行培養敏感的弦比較，與CompareOptions.Ordinal CompareOptions.OrdinalIgnoreCase值對此不影響。

其中一種或兩種比較都可以是 null。根據定義，任何字串（包括 String.Empty）都比大於空參考，而兩個空參考則比較相等。

當發現不等式或兩串字串都被比較時，比較即告終止。然而，如果兩串的比較結果等於其中一串的末端，而另一串字串還有字元，則剩餘字元的字串被視為較大。

給呼叫者的注意事項

字元集包含可忽略的字元，這些字元是執行語言或區分文化特性的比較時不會考慮的字元。 Compare(String, String, CultureInfo, CompareOptions)該方法在進行文化敏感比較時，並未考慮這些特徵。要辨識比較中可忽略的字元，請為參數提供 Ordinal 或 OrdinalIgnoreCaseoptions 值。

另請參閱

適用於

Compare(String, String, Boolean, CultureInfo)

來源:: String.Comparison.cs

來源:: String.Comparison.cs

來源:: String.Comparison.cs

來源:: String.Comparison.cs

來源:: String.Comparison.cs

比較兩個指定 String 物件，忽略或尊重其情況，並利用文化特定資訊影響比較，並回傳一個整數表示它們在排序順序中的相對位置。

public:
 static int Compare(System::String ^ strA, System::String ^ strB, bool ignoreCase, System::Globalization::CultureInfo ^ culture);

public static int Compare(string? strA, string? strB, bool ignoreCase, System.Globalization.CultureInfo? culture);

public static int Compare(string strA, string strB, bool ignoreCase, System.Globalization.CultureInfo culture);

static member Compare : string * string * bool * System.Globalization.CultureInfo -> int

Public Shared Function Compare (strA As String, strB As String, ignoreCase As Boolean, culture As CultureInfo) As Integer

參數

strA: String

要比較的第一個字串。

strB: String

要比較的第二個字串。

ignoreCase: Boolean

true在比較時忽略格;否則，。 false

culture: CultureInfo

提供文化特定比較資訊的物件。如果 culture 為 null，則會使用目前的文化特性。

傳回

Int32

一個32位元帶符號的整數，表示兩個比較元之間的詞彙關係。

價值	條件
低於零	`strA`依排序順序排列。`strB`
零	`strA`與排序順序相同。`strB`
大於零	`strA` 依排序順序跟隨 `strB` 。

範例

以下範例說明文化如何影響比較。在捷克-捷克共和國文化中，「ch」是指大於「d」的單一字元。然而，在英語與美國文化中，「ch」由兩個字元組成，而「c」小於「d」。

public static void Main()
{
    String str1 = "change";
    String str2 = "dollar";
    String relation;

    relation = symbol(String.Compare(str1, str2, false, new CultureInfo("en-US")));
    Console.WriteLine("For en-US: {0} {1} {2}", str1, relation, str2);

    relation = symbol(String.Compare(str1, str2, false, new CultureInfo("cs-CZ")));
    Console.WriteLine("For cs-CZ: {0} {1} {2}", str1, relation, str2);
}

private static String symbol(int r)
{
    String s = "=";
    if (r < 0) s = "<";
    else if (r > 0) s = ">";
    return s;
}

/*
This example produces the following results.
For en-US: change < dollar
For cs-CZ: change > dollar
*/

let symbol r =
    if r < 0 then "<"
    elif r > 0 then ">"
    else "="

let str1 = "change"
let str2 = "dollar"

let relation1 = 
    String.Compare(str1, str2, false, CultureInfo "en-US")
    |> symbol
printfn $"For en-US: {str1} {relation1} {str2}"

let relation2 = 
    String.Compare(str1, str2, false, CultureInfo "cs-CZ")
    |> symbol
printfn $"For cs-CZ: {str1} {relation2} {str2}"

(*
This example produces the following results.
For en-US: change < dollar
For cs-CZ: change > dollar
*)

Imports System.Globalization
 _

Class Sample
   Public Shared Sub Main()
      Dim str1 As [String] = "change"
      Dim str2 As [String] = "dollar"
      Dim relation As [String] = Nothing
      
      relation = symbol([String].Compare(str1, str2, False, New CultureInfo("en-US")))
      Console.WriteLine("For en-US: {0} {1} {2}", str1, relation, str2)
      
      relation = symbol([String].Compare(str1, str2, False, New CultureInfo("cs-CZ")))
      Console.WriteLine("For cs-CZ: {0} {1} {2}", str1, relation, str2)
   End Sub
   
   Private Shared Function symbol(r As Integer) As [String]
      Dim s As [String] = "="
      If r < 0 Then
         s = "<"
      Else
         If r > 0 Then
            s = ">"
         End If
      End If
      Return s
   End Function 'symbol
End Class
'
'This example produces the following results.
'For en-US: change < dollar
'For cs-CZ: change > dollar
'

備註

比較是使用單字排序規則進行的。關於字、字串和序數排序的更多資訊，請參見 System.Globalization.CompareOptions。

其中一個或兩個比較可以是 null。根據定義，任何字串，包括空字串（“”），都比空參考大於空參考;而兩個空參考則彼此比較為相等。

當發現不等式或兩串字串都被比較時，比較即告終止。然而，如果兩串的比較結果等於一個字串的末端，而另一串字串還有字元，則剩餘字元的字串被視為較大。回傳值是最後一次比較的結果。

static bool IsFileURI(String path)
{
    return (String.Compare(path, 0, "file:", 0, 5, true) == 0);
}

let isFileURI path =
    String.Compare(path, 0, "file:", 0, 5, true) = 0

Shared Function IsFileURI(ByVal path As String) As Boolean
    If String.Compare(path, 0, "file:", 0, 5, True) = 0 Then
        Return True
    Else
        Return False
    End If
End Function

用序數比較將路徑名稱與「檔案」進行比較。正確的程式碼如下：

static bool IsFileURI(String path)
{
    return (String.Compare(path, 0, "file:", 0, 5, StringComparison.OrdinalIgnoreCase) == 0);
}

let isFileURI path =
    String.Compare(path, 0, "file:", 0, 5, StringComparison.OrdinalIgnoreCase) = 0

Shared Function IsFileURI(ByVal path As String) As Boolean
    If String.Compare(path, 0, "file:", 0, 5, StringComparison.OrdinalIgnoreCase) = 0 Then
        Return True
    Else
        Return False
    End If
End Function

給呼叫者的注意事項

字元集包含可忽略的字元。 Compare(String, String, Boolean, CultureInfo)該方法在進行文化敏感比較時，並未考慮這些特徵。例如，若以下程式碼在 .NET Framework 4 或更新版本上執行，若使用不變文化將「animal」與「Ani-mal」（使用軟連字號或 U+00AD）進行大小寫不區分的比較，表示這兩個字串是等價的。

  string s1 = "Ani\u00ADmal";
  string s2 = "animal";

  Console.WriteLine("Comparison of '{0}' and '{1}': {2}", 
                  s1, s2, String.Compare(s1, s2, true,
                  CultureInfo.InvariantCulture));

  // The example displays the following output:
  //       Comparison of 'Ani-mal' and 'animal': 0

open System
open System.Globalization

let s1 = "Ani\u00ADmal"
let s2 = "animal"

printfn $"Comparison of '{s1}' and '{s2}': {String.Compare(s1, s2, true, CultureInfo.InvariantCulture)}"

// The example displays the following output:
//       Comparison of 'Ani-mal' and 'animal': 0

Imports System.Globalization

Module Example
   Public Sub Main()
      Dim s1 As String = "Ani" + ChrW(&h00AD) + "mal"
      Dim s2 As String = "animal"
      
      Console.WriteLine("Comparison of '{0}' and '{1}': {2}", 
                        s1, s2, String.Compare(s1, s2, True,
                        CultureInfo.InvariantCulture))
  End Sub
End Module
' The example displays the following output:
'       Comparison of 'ani-mal' and 'animal': 0

要辨識字串比較中可忽略的字元，呼叫該 Compare(String, String, CultureInfo, CompareOptions) 方法並為參數提供或 Ordinal OrdinalIgnoreCaseoptions 的值。

另請參閱

適用於

Compare(String, String, StringComparison)

來源:: String.Comparison.cs

來源:: String.Comparison.cs

來源:: String.Comparison.cs

來源:: String.Comparison.cs

來源:: String.Comparison.cs

使用指定規則比較兩個指定 String 物件，並回傳一個整數，表示它們在排序順序中的相對位置。

public:
 static int Compare(System::String ^ strA, System::String ^ strB, StringComparison comparisonType);

public static int Compare(string strA, string strB, StringComparison comparisonType);

public static int Compare(string? strA, string? strB, StringComparison comparisonType);

static member Compare : string * string * StringComparison -> int

Public Shared Function Compare (strA As String, strB As String, comparisonType As StringComparison) As Integer

參數

strA: String

要比較的第一個字串。

strB: String

要比較的第二個字串。

comparisonType: StringComparison

其中一個列舉值，用來指定比較時要使用的規則。

傳回

Int32

一個32位元帶符號的整數，表示兩個比較元之間的詞彙關係。

價值	條件
低於零	`strA`依排序順序排列。`strB`
零	`strA`與排序順序相同。`strB`
大於零	`strA` 依排序順序跟隨 `strB` 。

例外狀況

ArgumentException

comparisonType 不是一個 StringComparison 數值。

NotSupportedException

不支援 StringComparison。

範例

以下範例比較了三個字母「I」的版本。結果會受到培養物選擇、是否忽略個案，以及是否進行序數比較所影響。

// This example demonstrates the 
// System.String.Compare(String, String, StringComparison) method.

using System;
using System.Threading;

class Sample 
{
    public static void Main() 
    {
        string intro = "Compare three versions of the letter I using different " + 
                       "values of StringComparison.";

        // Define an array of strings where each element contains a version of the 
        // letter I. (An array of strings is used so you can easily modify this 
        // code example to test additional or different combinations of strings.)  

        string[] threeIs = new string[3];
        // LATIN SMALL LETTER I (U+0069)
        threeIs[0] = "\u0069";
        // LATIN SMALL LETTER DOTLESS I (U+0131)
        threeIs[1] = "\u0131";
        // LATIN CAPITAL LETTER I (U+0049)
        threeIs[2] = "\u0049";

        string[] unicodeNames = 
        {
            "LATIN SMALL LETTER I (U+0069)", 
            "LATIN SMALL LETTER DOTLESS I (U+0131)", 
            "LATIN CAPITAL LETTER I (U+0049)"
        };

        StringComparison[] scValues =
        {
            StringComparison.CurrentCulture,
            StringComparison.CurrentCultureIgnoreCase,
            StringComparison.InvariantCulture,
            StringComparison.InvariantCultureIgnoreCase,
            StringComparison.Ordinal,
            StringComparison.OrdinalIgnoreCase
        };

        Console.Clear();
        Console.WriteLine(intro);

        // Display the current culture because the culture-specific comparisons
        // can produce different results with different cultures.
        Console.WriteLine(
            "The current culture is {0}.\n", Thread.CurrentThread.CurrentCulture.Name);

        // Determine the relative sort order of three versions of the letter I. 
        foreach (StringComparison sc in scValues)
        {
            Console.WriteLine("StringComparison.{0}:", sc);

            // LATIN SMALL LETTER I (U+0069) : LATIN SMALL LETTER DOTLESS I (U+0131)
            Test(0, 1, sc, threeIs, unicodeNames);

            // LATIN SMALL LETTER I (U+0069) : LATIN CAPITAL LETTER I (U+0049)
            Test(0, 2, sc, threeIs, unicodeNames);

            // LATIN SMALL LETTER DOTLESS I (U+0131) : LATIN CAPITAL LETTER I (U+0049)
            Test(1, 2, sc, threeIs, unicodeNames);

            Console.WriteLine();
        }
    }

    protected static void Test(
        int x, int y, StringComparison comparison, string[] testI, string[] testNames)
    {
        string resultFmt = "{0} is {1} {2}";
        string result = "equal to";
        int cmpValue = 0;

        cmpValue = String.Compare(testI[x], testI[y], comparison);
        if (cmpValue < 0)
            result = "less than";
        else if (cmpValue > 0)
            result = "greater than";
        Console.WriteLine(resultFmt, testNames[x], result, testNames[y]);
    }
}

/*
This code example produces the following results:

Compare three versions of the letter I using different values of StringComparison.
The current culture is en-US.

StringComparison.CurrentCulture:
LATIN SMALL LETTER I (U+0069) is less than LATIN SMALL LETTER DOTLESS I (U+0131)
LATIN SMALL LETTER I (U+0069) is less than LATIN CAPITAL LETTER I (U+0049)
LATIN SMALL LETTER DOTLESS I (U+0131) is greater than LATIN CAPITAL LETTER I (U+0049)

StringComparison.CurrentCultureIgnoreCase:
LATIN SMALL LETTER I (U+0069) is less than LATIN SMALL LETTER DOTLESS I (U+0131)
LATIN SMALL LETTER I (U+0069) is equal to LATIN CAPITAL LETTER I (U+0049)
LATIN SMALL LETTER DOTLESS I (U+0131) is greater than LATIN CAPITAL LETTER I (U+0049)

StringComparison.InvariantCulture:
LATIN SMALL LETTER I (U+0069) is less than LATIN SMALL LETTER DOTLESS I (U+0131)
LATIN SMALL LETTER I (U+0069) is less than LATIN CAPITAL LETTER I (U+0049)
LATIN SMALL LETTER DOTLESS I (U+0131) is greater than LATIN CAPITAL LETTER I (U+0049)

StringComparison.InvariantCultureIgnoreCase:
LATIN SMALL LETTER I (U+0069) is less than LATIN SMALL LETTER DOTLESS I (U+0131)
LATIN SMALL LETTER I (U+0069) is equal to LATIN CAPITAL LETTER I (U+0049)
LATIN SMALL LETTER DOTLESS I (U+0131) is greater than LATIN CAPITAL LETTER I (U+0049)

StringComparison.Ordinal:
LATIN SMALL LETTER I (U+0069) is less than LATIN SMALL LETTER DOTLESS I (U+0131)
LATIN SMALL LETTER I (U+0069) is greater than LATIN CAPITAL LETTER I (U+0049)
LATIN SMALL LETTER DOTLESS I (U+0131) is greater than LATIN CAPITAL LETTER I (U+0049)

StringComparison.OrdinalIgnoreCase:
LATIN SMALL LETTER I (U+0069) is less than LATIN SMALL LETTER DOTLESS I (U+0131)
LATIN SMALL LETTER I (U+0069) is equal to LATIN CAPITAL LETTER I (U+0049)
LATIN SMALL LETTER DOTLESS I (U+0131) is greater than LATIN CAPITAL LETTER I (U+0049)

*/

// This example demonstrates the 
// System.String.Compare(String, String, StringComparison) method.

open System
open System.Threading

let test x y (comparison: StringComparison) (testI: string[]) (testNames: string[]) =
    let cmpValue = String.Compare(testI[x], testI[y], comparison)
    let result =
        if cmpValue < 0 then
            "less than"
        elif cmpValue > 0 then
            "greater than"
        else
            "equal to"
    printfn $"{testNames[x]} is {result} {testNames[y]}"

let intro = "Compare three versions of the letter I using different values of StringComparison."

// Define an array of strings where each element contains a version of the 
// letter I. (An array of strings is used so you can easily modify this 
// code example to test additional or different combinations of strings.)  

let threeIs = 
  [|// LATIN SMALL LETTER I (U+0069)
    "\u0069"
    // LATIN SMALL LETTER DOTLESS I (U+0131)
    "\u0131"
    // LATIN CAPITAL LETTER I (U+0049)
    "\u0049" |]

let unicodeNames =
    [| "LATIN SMALL LETTER I (U+0069)"
       "LATIN SMALL LETTER DOTLESS I (U+0131)"
       "LATIN CAPITAL LETTER I (U+0049)" |]

let scValues =
    [| StringComparison.CurrentCulture
       StringComparison.CurrentCultureIgnoreCase
       StringComparison.InvariantCulture
       StringComparison.InvariantCultureIgnoreCase
       StringComparison.Ordinal
       StringComparison.OrdinalIgnoreCase |]

Console.Clear()
printfn $"{intro}"

// Display the current culture because the culture-specific comparisons
// can produce different results with different cultures.
printfn $"The current culture is {Thread.CurrentThread.CurrentCulture.Name}.\n"

// Determine the relative sort order of three versions of the letter I. 
for sc in scValues do
    printfn $"StringComparison.{sc}:"

    // LATIN SMALL LETTER I (U+0069) : LATIN SMALL LETTER DOTLESS I (U+0131)
    test 0 1 sc threeIs unicodeNames

    // LATIN SMALL LETTER I (U+0069) : LATIN CAPITAL LETTER I (U+0049)
    test 0 2 sc threeIs unicodeNames

    // LATIN SMALL LETTER DOTLESS I (U+0131) : LATIN CAPITAL LETTER I (U+0049)
    test 1 2 sc threeIs unicodeNames

    printfn ""

(*
This code example produces the following results:

Compare three versions of the letter I using different values of StringComparison.
The current culture is en-US.

StringComparison.CurrentCulture:
LATIN SMALL LETTER I (U+0069) is less than LATIN SMALL LETTER DOTLESS I (U+0131)
LATIN SMALL LETTER I (U+0069) is less than LATIN CAPITAL LETTER I (U+0049)
LATIN SMALL LETTER DOTLESS I (U+0131) is greater than LATIN CAPITAL LETTER I (U+0049)

StringComparison.CurrentCultureIgnoreCase:
LATIN SMALL LETTER I (U+0069) is less than LATIN SMALL LETTER DOTLESS I (U+0131)
LATIN SMALL LETTER I (U+0069) is equal to LATIN CAPITAL LETTER I (U+0049)
LATIN SMALL LETTER DOTLESS I (U+0131) is greater than LATIN CAPITAL LETTER I (U+0049)

StringComparison.InvariantCulture:
LATIN SMALL LETTER I (U+0069) is less than LATIN SMALL LETTER DOTLESS I (U+0131)
LATIN SMALL LETTER I (U+0069) is less than LATIN CAPITAL LETTER I (U+0049)
LATIN SMALL LETTER DOTLESS I (U+0131) is greater than LATIN CAPITAL LETTER I (U+0049)

StringComparison.InvariantCultureIgnoreCase:
LATIN SMALL LETTER I (U+0069) is less than LATIN SMALL LETTER DOTLESS I (U+0131)
LATIN SMALL LETTER I (U+0069) is equal to LATIN CAPITAL LETTER I (U+0049)
LATIN SMALL LETTER DOTLESS I (U+0131) is greater than LATIN CAPITAL LETTER I (U+0049)

StringComparison.Ordinal:
LATIN SMALL LETTER I (U+0069) is less than LATIN SMALL LETTER DOTLESS I (U+0131)
LATIN SMALL LETTER I (U+0069) is greater than LATIN CAPITAL LETTER I (U+0049)
LATIN SMALL LETTER DOTLESS I (U+0131) is greater than LATIN CAPITAL LETTER I (U+0049)

StringComparison.OrdinalIgnoreCase:
LATIN SMALL LETTER I (U+0069) is less than LATIN SMALL LETTER DOTLESS I (U+0131)
LATIN SMALL LETTER I (U+0069) is equal to LATIN CAPITAL LETTER I (U+0049)
LATIN SMALL LETTER DOTLESS I (U+0131) is greater than LATIN CAPITAL LETTER I (U+0049)
*)

' This example demonstrates the 
' System.String.Compare(String, String, StringComparison) method.

Imports System.Threading

Class Sample
    Public Shared Sub Main() 
        Dim intro As String = "Compare three versions of the letter I using different " & _
                              "values of StringComparison."
        
        ' Define an array of strings where each element contains a version of the 
        ' letter I. (An array of strings is used so you can easily modify this 
        ' code example to test additional or different combinations of strings.)  
        Dim threeIs(2) As String
        ' LATIN SMALL LETTER I (U+0069)
        threeIs(0) = "i"
        ' LATIN SMALL LETTER DOTLESS I (U+0131)
        threeIs(1) = "ı"
        ' LATIN CAPITAL LETTER I (U+0049)
        threeIs(2) = "I"
        
        Dim unicodeNames As String() =  { _
                            "LATIN SMALL LETTER I (U+0069)", _
                            "LATIN SMALL LETTER DOTLESS I (U+0131)", _
                            "LATIN CAPITAL LETTER I (U+0049)" }
        
        Dim scValues As StringComparison() =  { _
                            StringComparison.CurrentCulture, _
                            StringComparison.CurrentCultureIgnoreCase, _
                            StringComparison.InvariantCulture, _
                            StringComparison.InvariantCultureIgnoreCase, _
                            StringComparison.Ordinal, _
                            StringComparison.OrdinalIgnoreCase }
        '
        Console.Clear()
        Console.WriteLine(intro)
        
        ' Display the current culture because the culture-specific comparisons
        ' can produce different results with different cultures.
        Console.WriteLine("The current culture is {0}." & vbCrLf, _
                           Thread.CurrentThread.CurrentCulture.Name)
        
        ' Determine the relative sort order of three versions of the letter I. 
        Dim sc As StringComparison
        For Each sc In  scValues
            Console.WriteLine("StringComparison.{0}:", sc)
            
            ' LATIN SMALL LETTER I (U+0069) : LATIN SMALL LETTER DOTLESS I (U+0131)
            Test(0, 1, sc, threeIs, unicodeNames)
            
            ' LATIN SMALL LETTER I (U+0069) : LATIN CAPITAL LETTER I (U+0049)
            Test(0, 2, sc, threeIs, unicodeNames)
            
            ' LATIN SMALL LETTER DOTLESS I (U+0131) : LATIN CAPITAL LETTER I (U+0049)
            Test(1, 2, sc, threeIs, unicodeNames)
            
            Console.WriteLine()
        Next sc
    
    End Sub
    
    Protected Shared Sub Test(ByVal x As Integer, ByVal y As Integer, _
                              ByVal comparison As StringComparison, _
                              ByVal testI() As String, ByVal testNames() As String) 
        Dim resultFmt As String = "{0} is {1} {2}"
        Dim result As String = "equal to"
        Dim cmpValue As Integer = 0
        '
        cmpValue = String.Compare(testI(x), testI(y), comparison)
        If cmpValue < 0 Then
            result = "less than"
        ElseIf cmpValue > 0 Then
            result = "greater than"
        End If
        Console.WriteLine(resultFmt, testNames(x), result, testNames(y))
    
    End Sub
End Class

'
'This code example produces the following results:
'
'Compare three versions of the letter I using different values of StringComparison.
'The current culture is en-US.
'
'StringComparison.CurrentCulture:
'LATIN SMALL LETTER I (U+0069) is less than LATIN SMALL LETTER DOTLESS I (U+0131)
'LATIN SMALL LETTER I (U+0069) is less than LATIN CAPITAL LETTER I (U+0049)
'LATIN SMALL LETTER DOTLESS I (U+0131) is greater than LATIN CAPITAL LETTER I (U+0049)
'
'StringComparison.CurrentCultureIgnoreCase:
'LATIN SMALL LETTER I (U+0069) is less than LATIN SMALL LETTER DOTLESS I (U+0131)
'LATIN SMALL LETTER I (U+0069) is equal to LATIN CAPITAL LETTER I (U+0049)
'LATIN SMALL LETTER DOTLESS I (U+0131) is greater than LATIN CAPITAL LETTER I (U+0049)
'
'StringComparison.InvariantCulture:
'LATIN SMALL LETTER I (U+0069) is less than LATIN SMALL LETTER DOTLESS I (U+0131)
'LATIN SMALL LETTER I (U+0069) is less than LATIN CAPITAL LETTER I (U+0049)
'LATIN SMALL LETTER DOTLESS I (U+0131) is greater than LATIN CAPITAL LETTER I (U+0049)
'
'StringComparison.InvariantCultureIgnoreCase:
'LATIN SMALL LETTER I (U+0069) is less than LATIN SMALL LETTER DOTLESS I (U+0131)
'LATIN SMALL LETTER I (U+0069) is equal to LATIN CAPITAL LETTER I (U+0049)
'LATIN SMALL LETTER DOTLESS I (U+0131) is greater than LATIN CAPITAL LETTER I (U+0049)
'
'StringComparison.Ordinal:
'LATIN SMALL LETTER I (U+0069) is less than LATIN SMALL LETTER DOTLESS I (U+0131)
'LATIN SMALL LETTER I (U+0069) is greater than LATIN CAPITAL LETTER I (U+0049)
'LATIN SMALL LETTER DOTLESS I (U+0131) is greater than LATIN CAPITAL LETTER I (U+0049)
'
'StringComparison.OrdinalIgnoreCase:
'LATIN SMALL LETTER I (U+0069) is less than LATIN SMALL LETTER DOTLESS I (U+0131)
'LATIN SMALL LETTER I (U+0069) is equal to LATIN CAPITAL LETTER I (U+0049)
'LATIN SMALL LETTER DOTLESS I (U+0131) is greater than LATIN CAPITAL LETTER I (U+0049)
'

備註

參數 comparisonType 指示比較是否應使用當前或不變的文化，採用或忽略比較的案例，或使用詞彙（文化敏感）或序數（文化敏感）排序規則。

其中一個或兩個比較可以是 null。根據定義，任何字串，包括空字串（“”），都比空參考大於空參考;而兩個空參考則彼此比較為相等。

static bool IsFileURI(String path)
{
    return (String.Compare(path, 0, "file:", 0, 5, true) == 0);
}

let isFileURI path =
    String.Compare(path, 0, "file:", 0, 5, true) = 0

Shared Function IsFileURI(ByVal path As String) As Boolean
    If String.Compare(path, 0, "file:", 0, 5, True) = 0 Then
        Return True
    Else
        Return False
    End If
End Function

用序數比較將路徑名稱與「檔案」進行比較。正確的程式碼如下：

static bool IsFileURI(String path)
{
    return (String.Compare(path, 0, "file:", 0, 5, StringComparison.OrdinalIgnoreCase) == 0);
}

let isFileURI path =
    String.Compare(path, 0, "file:", 0, 5, StringComparison.OrdinalIgnoreCase) = 0

Shared Function IsFileURI(ByVal path As String) As Boolean
    If String.Compare(path, 0, "file:", 0, 5, StringComparison.OrdinalIgnoreCase) = 0 Then
        Return True
    Else
        Return False
    End If
End Function

給呼叫者的注意事項

字元集包含可忽略的字元。 Compare(String, String, StringComparison)該方法在進行文化敏感比較時，並未考慮這些特徵。要辨識比較中可忽略的字元，請為參數提供 Ordinal 或 OrdinalIgnoreCasecomparisonType 值。

另請參閱

適用於

Compare(String, String, Boolean)

來源:: String.Comparison.cs

來源:: String.Comparison.cs

來源:: String.Comparison.cs

來源:: String.Comparison.cs

來源:: String.Comparison.cs

比較兩個指定 String 物件，忽略或尊重其大小，並回傳一個整數，表示它們在排序順序中的相對位置。

public:
 static int Compare(System::String ^ strA, System::String ^ strB, bool ignoreCase);

public static int Compare(string strA, string strB, bool ignoreCase);

public static int Compare(string? strA, string? strB, bool ignoreCase);

static member Compare : string * string * bool -> int

Public Shared Function Compare (strA As String, strB As String, ignoreCase As Boolean) As Integer

參數

strA: String

要比較的第一個字串。

strB: String

要比較的第二個字串。

ignoreCase: Boolean

true在比較時忽略格;否則，。 false

傳回

Int32

一個32位元帶符號的整數，表示兩個比較元之間的詞彙關係。

價值	條件
低於零	`strA`依排序順序排列。`strB`
零	`strA`與排序順序相同。`strB`
大於零	`strA` 依排序順序跟隨 `strB` 。

範例

以下範例說明該 Compare(String, String, Boolean) 方法等同於使用 ToUpper 或 ToLower 在比較字串時。

// Create upper-case characters from their Unicode code units.
String stringUpper = "\x0041\x0042\x0043";

// Create lower-case characters from their Unicode code units.
String stringLower = "\x0061\x0062\x0063";

// Display the strings.
Console.WriteLine("Comparing '{0}' and '{1}':", 
                stringUpper, stringLower);

// Compare the uppercased strings; the result is true.
Console.WriteLine("The Strings are equal when capitalized? {0}",
                String.Compare(stringUpper.ToUpper(), stringLower.ToUpper()) == 0 
                               ? "true" : "false");

// The previous method call is equivalent to this Compare method, which ignores case.
Console.WriteLine("The Strings are equal when case is ignored? {0}",
                String.Compare(stringUpper, stringLower, true) == 0
                               ? "true" : "false" );

// The example displays the following output:
//       Comparing 'ABC' and 'abc':
//       The Strings are equal when capitalized? true
//       The Strings are equal when case is ignored? true

open System

// Create upper-case characters from their Unicode code units.
let stringUpper = "\x0041\x0042\x0043"

// Create lower-case characters from their Unicode code units.
let stringLower = "\x0061\x0062\x0063"

// Display the strings.
printfn $"Comparing '{stringUpper}' and '{stringLower}':"

// Compare the uppercased strings the result is true.
printfn $"The Strings are equal when capitalized? %b{String.Compare(stringUpper.ToUpper(), stringLower.ToUpper()) = 0}"

// The previous method call is equivalent to this Compare method, which ignores case.
printfn $"The Strings are equal when case is ignored? %b{String.Compare(stringUpper, stringLower, true) = 0}"

// The example displays the following output:
//       Comparing 'ABC' and 'abc':
//       The Strings are equal when capitalized? true
//       The Strings are equal when case is ignored? true

Public Module Example
   Public Sub Main()
      ' Create upper-case characters from their Unicode code units.
      Dim stringUpper As String = ChrW(&H41) + ChrW(&H42) + ChrW(&H43)

      ' Create lower-case characters from their Unicode code units.
      Dim stringLower As String = ChrW(&H61) + ChrW(&H62) + ChrW(&H63)

      ' Display the strings.
      Console.WriteLine("Comparing '{0}' and '{1}':", 
                        stringUpper, stringLower)

      ' Compare the uppercased strings; the result is true.
      Console.WriteLine("The Strings are equal when capitalized? {0}",
                        If(String.Compare(stringUpper.ToUpper(), stringLower.ToUpper()) = 0, 
                                          "true", "false"))

      ' The previous method call is equivalent to this Compare method, which ignores case.
      Console.WriteLine("The Strings are equal when case is ignored? {0}",
                        If(String.Compare(stringUpper, stringLower, true) = 0,
                                          "true", "false"))
   End Sub
End Module 
' The example displays the following output:
'       Comparing 'ABC' and 'abc':
'       The Strings are equal when capitalized? true
'       The Strings are equal when case is ignored? true

備註

比較是使用單字排序規則進行的。關於字、字串和序數排序的更多資訊，請參見 System.Globalization.CompareOptions。

警告

在比較字串時，你應該呼叫該 Compare(String, String, StringComparison) 方法，這需要你明確指定該方法所使用的字串比較類型。如需詳細資訊，請參閱使用字串的最佳做法。

其中一個或兩個比較可以是 null。根據定義，任何字串，包括空字串（“”），都比空參考大於空參考;而兩個空參考則彼此比較為相等。

static bool IsFileURI(String path)
{
    return (String.Compare(path, 0, "file:", 0, 5, true) == 0);
}

let isFileURI path =
    String.Compare(path, 0, "file:", 0, 5, true) = 0

Shared Function IsFileURI(ByVal path As String) As Boolean
    If String.Compare(path, 0, "file:", 0, 5, True) = 0 Then
        Return True
    Else
        Return False
    End If
End Function

用序數比較將路徑名稱與「檔案」進行比較。正確的程式碼如下：

static bool IsFileURI(String path)
{
    return (String.Compare(path, 0, "file:", 0, 5, StringComparison.OrdinalIgnoreCase) == 0);
}

let isFileURI path =
    String.Compare(path, 0, "file:", 0, 5, StringComparison.OrdinalIgnoreCase) = 0

Shared Function IsFileURI(ByVal path As String) As Boolean
    If String.Compare(path, 0, "file:", 0, 5, StringComparison.OrdinalIgnoreCase) = 0 Then
        Return True
    Else
        Return False
    End If
End Function

給呼叫者的注意事項

字元集包含可忽略的字元。 Compare(String, String, Boolean)該方法在進行文化敏感比較時，並未考慮這些特徵。例如，將「animal」與「Ani-mal」進行文化敏感且不區分大小寫的比較（使用軟連字號或 U+00AD），表示這兩個字串是等價的。

string s1 = "Ani\u00ADmal";
string s2 = "animal";

Console.WriteLine("Comparison of '{0}' and '{1}': {2}",
                s1, s2, String.Compare(s1, s2, true));

// The example displays the following output:
//       Comparison of 'Ani-mal' and 'animal': 0

open System

let s1 = "Ani\u00ADmal"
let s2 = "animal"

printfn $"Comparison of '{s1}' and '{s2}': {String.Compare(s1, s2, true)}"

// The example displays the following output:
//       Comparison of 'Ani-mal' and 'animal': 0

Module Example
   Public Sub Main()
      Dim s1 As String = "Ani" + ChrW(&h00AD) + "mal"
      Dim s2 As String = "animal"
      
      Console.WriteLine("Comparison of '{0}' and '{1}': {2}", 
                        s1, s2, String.Compare(s1, s2, True))
  End Sub
End Module
' The example displays the following output:
'       Comparison of 'ani-mal' and 'animal': 0

要辨識字串比較中可忽略的字元，呼叫該 Compare(String, String, StringComparison) 方法並為參數提供或 Ordinal OrdinalIgnoreCasecomparisonType 的值。

另請參閱

適用於

Compare(String, String)

來源:: String.Comparison.cs

來源:: String.Comparison.cs

來源:: String.Comparison.cs

來源:: String.Comparison.cs

來源:: String.Comparison.cs

比較兩個指定的 String 物件，並回傳一個整數，表示它們在排序順序中的相對位置。

public:
 static int Compare(System::String ^ strA, System::String ^ strB);

public static int Compare(string strA, string strB);

public static int Compare(string? strA, string? strB);

static member Compare : string * string -> int

Public Shared Function Compare (strA As String, strB As String) As Integer

參數

strA: String

要比較的第一個字串。

strB: String

要比較的第二個字串。

傳回

Int32

一個32位元帶符號的整數，表示兩個比較元之間的詞彙關係。

價值	條件
低於零	`strA`依排序順序排列。`strB`
零	`strA`與排序順序相同。`strB`
大於零	`strA` 依排序順序跟隨 `strB` 。

範例

以下範例將使用 Compare(String, String) 比較三組字串的方法。

// Create upper-case characters from their Unicode code units.
String stringUpper = "\x0041\x0042\x0043";

// Create lower-case characters from their Unicode code units.
String stringLower = "\x0061\x0062\x0063";

// Display the strings.
Console.WriteLine("Comparing '{0}' and '{1}':", 
                stringUpper, stringLower);

// Compare the uppercased strings; the result is true.
Console.WriteLine("The Strings are equal when capitalized? {0}",
                String.Compare(stringUpper.ToUpper(), stringLower.ToUpper()) == 0 
                               ? "true" : "false");

// The previous method call is equivalent to this Compare method, which ignores case.
Console.WriteLine("The Strings are equal when case is ignored? {0}",
                String.Compare(stringUpper, stringLower, true) == 0
                               ? "true" : "false" );

// The example displays the following output:
//       Comparing 'ABC' and 'abc':
//       The Strings are equal when capitalized? true
//       The Strings are equal when case is ignored? true

open System

// Create upper-case characters from their Unicode code units.
let stringUpper = "\x0041\x0042\x0043"

// Create lower-case characters from their Unicode code units.
let stringLower = "\x0061\x0062\x0063"

// Display the strings.
printfn $"Comparing '{stringUpper}' and '{stringLower}':"

// Compare the uppercased strings the result is true.
printfn $"The Strings are equal when capitalized? %b{String.Compare(stringUpper.ToUpper(), stringLower.ToUpper()) = 0}"

// The previous method call is equivalent to this Compare method, which ignores case.
printfn $"The Strings are equal when case is ignored? %b{String.Compare(stringUpper, stringLower, true) = 0}"

// The example displays the following output:
//       Comparing 'ABC' and 'abc':
//       The Strings are equal when capitalized? true
//       The Strings are equal when case is ignored? true

Public Module Example
   Public Sub Main()
      ' Create upper-case characters from their Unicode code units.
      Dim stringUpper As String = ChrW(&H41) + ChrW(&H42) + ChrW(&H43)

      ' Create lower-case characters from their Unicode code units.
      Dim stringLower As String = ChrW(&H61) + ChrW(&H62) + ChrW(&H63)

      ' Display the strings.
      Console.WriteLine("Comparing '{0}' and '{1}':", 
                        stringUpper, stringLower)

      ' Compare the uppercased strings; the result is true.
      Console.WriteLine("The Strings are equal when capitalized? {0}",
                        If(String.Compare(stringUpper.ToUpper(), stringLower.ToUpper()) = 0, 
                                          "true", "false"))

      ' The previous method call is equivalent to this Compare method, which ignores case.
      Console.WriteLine("The Strings are equal when case is ignored? {0}",
                        If(String.Compare(stringUpper, stringLower, true) = 0,
                                          "true", "false"))
   End Sub
End Module 
' The example displays the following output:
'       Comparing 'ABC' and 'abc':
'       The Strings are equal when capitalized? true
'       The Strings are equal when case is ignored? true

在以下範例中，該 ReverseStringComparer 類別示範如何用該 Compare 方法評估兩串字串。

using System;
using System.Text;
using System.Collections;

public class SamplesArrayList
{

    public static void Main()
    {
        // Creates and initializes a new ArrayList.
        ArrayList myAL = new ArrayList();
        myAL.Add("Eric");
        myAL.Add("Mark");
        myAL.Add("Lance");
        myAL.Add("Rob");
        myAL.Add("Kris");
        myAL.Add("Brad");
        myAL.Add("Kit");
        myAL.Add("Bradley");
        myAL.Add("Keith");
        myAL.Add("Susan");

        // Displays the properties and values of	the	ArrayList.
        Console.WriteLine("Count: {0}", myAL.Count);

        PrintValues("Unsorted", myAL);
        myAL.Sort();
        PrintValues("Sorted", myAL);
        myAL.Sort(new ReverseStringComparer());
        PrintValues("Reverse", myAL);

        string[] names = (string[])myAL.ToArray(typeof(string));
    }
    public static void PrintValues(string title, IEnumerable myList)
    {
        Console.Write("{0,10}: ", title);
        StringBuilder sb = new StringBuilder();
        foreach (string s in myList)
        {
            sb.AppendFormat("{0}, ", s);
        }
        sb.Remove(sb.Length - 2, 2);
        Console.WriteLine(sb);
    }
}
public class ReverseStringComparer : IComparer
{
    public int Compare(object? x, object? y)
    {
        string? s1 = x as string;
        string? s2 = y as string;
        //negate the return value to get the reverse order
        return -String.Compare(s1, s2);
    }
}

open System
open System.Text
open System.Collections.Generic

type ReverseStringComparer() =
    interface IComparer<string> with
        member _.Compare(x, y) =
            -String.Compare(x, y)

let printValues title (myList: #seq<string>) =
    printf $"{title,10}: "
    let sb = StringBuilder()
    for s in myList do
        sb.Append $"{s}, " |> ignore
    sb.Remove(sb.Length - 2, 2) |> ignore
    printfn $"{sb}"

// Creates and initializes a new ResizeArray.
let myAL = ResizeArray()
myAL.Add "Eric"
myAL.Add "Mark"
myAL.Add "Lance"
myAL.Add "Rob"
myAL.Add "Kris"
myAL.Add "Brad"
myAL.Add "Kit"
myAL.Add "Bradley"
myAL.Add "Keith"
myAL.Add "Susan"

// Displays the properties and values of	the	ArrayList.
printfn $"Count: {myAL.Count}"

printValues "Unsorted" myAL
myAL.Sort()
printValues "Sorted" myAL
myAL.Sort(ReverseStringComparer())
printValues "Reverse" myAL

Imports System.Text
Imports System.Collections



Public Class SamplesArrayList
    
    
    Public Shared Sub Main()
        Dim myAL As New ArrayList()
        ' Creates and initializes a new ArrayList.
        myAL.Add("Eric")
        myAL.Add("Mark")
        myAL.Add("Lance")
        myAL.Add("Rob")
        myAL.Add("Kris")
        myAL.Add("Brad")
        myAL.Add("Kit")
        myAL.Add("Bradley")
        myAL.Add("Keith")
        myAL.Add("Susan")
        
        ' Displays the properties and values of	the	ArrayList.
        Console.WriteLine("Count: {0}", myAL.Count)
        PrintValues("Unsorted", myAL)
        myAL.Sort()
        PrintValues("Sorted", myAL)
        Dim comp as New ReverseStringComparer
        myAL.Sort(comp)
        PrintValues("Reverse", myAL)

        Dim names As String() = CType(myAL.ToArray(GetType(String)), String())
    End Sub
   
   
    
    Public Shared Sub PrintValues(title As String, myList As IEnumerable)
        Console.Write("{0,10}: ", title)
        Dim sb As New StringBuilder()
        Dim s As String
        For Each s In  myList
            sb.AppendFormat("{0}, ", s)
        Next s
        sb.Remove(sb.Length - 2, 2)
        Console.WriteLine(sb)
    End Sub
End Class

Public Class ReverseStringComparer 
  Implements IComparer
    
     Function Compare(x As Object, y As Object) As Integer implements IComparer.Compare
        Dim s1 As String = CStr (x)
        Dim s2 As String = CStr (y)
        
        'negate the return value to get the reverse order
        Return - [String].Compare(s1, s2)
    
    End Function 'Compare
End Class

備註

比較是使用單字排序規則進行的。關於字、字串和序數排序的更多資訊，請參見 System.Globalization.CompareOptions。

警告

其中一個或兩個比較可以是 null。根據定義，任何字串，包括空字串（“”），都比空參考大於空參考;而兩個空參考則彼此比較為相等。

static bool IsFileURI(String path)
{
    return (String.Compare(path, 0, "file:", 0, 5, true) == 0);
}

let isFileURI path =
    String.Compare(path, 0, "file:", 0, 5, true) = 0

Shared Function IsFileURI(ByVal path As String) As Boolean
    If String.Compare(path, 0, "file:", 0, 5, True) = 0 Then
        Return True
    Else
        Return False
    End If
End Function

用序數比較將路徑名稱與「檔案」進行比較。正確的程式碼如下：

static bool IsFileURI(String path)
{
    return (String.Compare(path, 0, "file:", 0, 5, StringComparison.OrdinalIgnoreCase) == 0);
}

let isFileURI path =
    String.Compare(path, 0, "file:", 0, 5, StringComparison.OrdinalIgnoreCase) = 0

Shared Function IsFileURI(ByVal path As String) As Boolean
    If String.Compare(path, 0, "file:", 0, 5, StringComparison.OrdinalIgnoreCase) = 0 Then
        Return True
    Else
        Return False
    End If
End Function

給呼叫者的注意事項

字元集包含可忽略的字元。 Compare(String, String)該方法在進行文化敏感比較時，並未考慮這些特徵。例如，若以下程式碼運行於 .NET Framework 4 或更新版本，若能以文化敏感方式比較「animal」與「ani-mal」（使用軟連字號或 U+00AD），即可表示這兩個字串是等價的。

string s1 = "ani\u00ADmal";
string s2 = "animal";

Console.WriteLine("Comparison of '{0}' and '{1}': {2}",
                s1, s2, String.Compare(s1, s2));

// The example displays the following output:
//       Comparison of 'ani-mal' and 'animal': 0

open System

let s1 = "ani\u00ADmal"
let s2 = "animal"

printfn $"Comparison of '{s1}' and '{s2}': {String.Compare(s1, s2)}"

// The example displays the following output:
//       Comparison of 'ani-mal' and 'animal': 0

Module Example
   Public Sub Main()
      Dim s1 As String = "ani" + ChrW(&h00AD) + "mal"
      Dim s2 As String = "animal"
      
      Console.WriteLine("Comparison of '{0}' and '{1}': {2}", 
                        s1, s2, String.Compare(s1, s2))
  End Sub
End Module
' The example displays the following output:
'       Comparison of 'ani-mal' and 'animal': 0

要辨識字串比較中可忽略的字元，呼叫該 Compare(String, String, StringComparison) 方法並為參數提供或 Ordinal OrdinalIgnoreCasecomparisonType 的值。

另請參閱

適用於

意見反應

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