DateTimeOffset.Equals 方法

定義

命名空間:: System

組件:: mscorlib.dll, System.Runtime.dll

組件:: mscorlib.dll

組件:: System.Runtime.dll

組件:: netstandard.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。

判斷兩個 DateTimeOffset 物件是否相等，或物件 DateTimeOffset 是否等於指定物件。

多載

名稱	Description
Equals(DateTimeOffset)	判斷當前 DateTimeOffset 物件是否代表與指定 DateTimeOffset 物件相同的時間點。
Equals(Object)	判斷一個 DateTimeOffset 物體是否代表與指定物體相同的時間點。
Equals(DateTimeOffset, DateTimeOffset)	判斷兩個指定 DateTimeOffset 物件是否代表同一時間點。

Equals(DateTimeOffset)

判斷當前 DateTimeOffset 物件是否代表與指定 DateTimeOffset 物件相同的時間點。

public:
 virtual bool Equals(DateTimeOffset other);

public bool Equals(DateTimeOffset other);

override this.Equals : DateTimeOffset -> bool

Public Function Equals (other As DateTimeOffset) As Boolean

參數

other: DateTimeOffset

一個可以與當前 DateTimeOffset 物件比較的物件。

傳回

Boolean

true 若兩個 DateTimeOffset 物件值相同 UtcDateTime ;否則， false。

實作

Equals(T)

範例

以下範例說明了測試Equals(DateTimeOffset)DateTimeOffset物件與當前DateTimeOffset物件相等的方法呼叫。

private static void CompareForEquality1()
{
   DateTimeOffset firstTime = new DateTimeOffset(2007, 9, 1, 6, 45, 0,
                              new TimeSpan(-7, 0, 0));

   DateTimeOffset secondTime = firstTime;
   Console.WriteLine("{0} = {1}: {2}",
                     firstTime, secondTime,
                     firstTime.Equals(secondTime));

   secondTime = new DateTimeOffset(2007, 9, 1, 6, 45, 0,
                    new TimeSpan(-6, 0, 0));
   Console.WriteLine("{0} = {1}: {2}",
                    firstTime, secondTime,
                    firstTime.Equals(secondTime));

   secondTime = new DateTimeOffset(2007, 9, 1, 8, 45, 0,
                    new TimeSpan(-5, 0, 0));
   Console.WriteLine("{0} = {1}: {2}",
                    firstTime, secondTime,
                    firstTime.Equals(secondTime));
   // The example displays the following output to the console:
   //      9/1/2007 6:45:00 AM -07:00 = 9/1/2007 6:45:00 AM -07:00: True
   //      9/1/2007 6:45:00 AM -07:00 = 9/1/2007 6:45:00 AM -06:00: False
   //      9/1/2007 6:45:00 AM -07:00 = 9/1/2007 8:45:00 AM -05:00: True

let firstTime = DateTimeOffset(2007, 9, 1, 6, 45, 0, TimeSpan(-7, 0, 0))

let secondTime = firstTime
printfn $"{firstTime} = {secondTime}: {firstTime.Equals secondTime}"

let secondTime = DateTimeOffset(2007, 9, 1, 6, 45, 0, TimeSpan(-6, 0, 0))
printfn $"{firstTime} = {secondTime}: {firstTime.Equals secondTime}"

let secondTime = DateTimeOffset(2007, 9, 1, 8, 45, 0, TimeSpan(-5, 0, 0))
printfn $"{firstTime} = {secondTime}: {firstTime.Equals secondTime}"

// The example displays the following output to the console:
//      9/1/2007 6:45:00 AM -07:00 = 9/1/2007 6:45:00 AM -07:00: True
//      9/1/2007 6:45:00 AM -07:00 = 9/1/2007 6:45:00 AM -06:00: False
//      9/1/2007 6:45:00 AM -07:00 = 9/1/2007 8:45:00 AM -05:00: True

    Dim firstTime As New DateTimeOffset(#09/01/2007 6:45:00AM#, _
                     New TimeSpan(-7, 0, 0))

    Dim secondTime As DateTimeOffset = firstTime
    Console.WriteLine("{0} = {1}: {2}", _
                      firstTime, secondTime, _
                      firstTime.Equals(secondTime))

    secondTime = New DateTimeOffset(#09/01/2007 6:45:00AM#, _
                     New TimeSpan(-6, 0, 0))      
    Console.WriteLine("{0} = {1}: {2}", _
                     firstTime, secondTime, _
                     firstTime.Equals(secondTime))
    
    secondTime = New DateTimeOffset(#09/01/2007 8:45:00AM#, _
                     New TimeSpan(-5, 0, 0))
    Console.WriteLine("{0} = {1}: {2}", _
                     firstTime, secondTime, _
                     firstTime.Equals(secondTime))
    ' The example displays the following output to the console:
    '       9/1/2007 6:45:00 AM -07:00 = 9/1/2007 6:45:00 AM -07:00: True
    '       9/1/2007 6:45:00 AM -07:00 = 9/1/2007 6:45:00 AM -06:00: False
    '       9/1/2007 6:45:00 AM -07:00 = 9/1/2007 8:45:00 AM -05:00: True

備註

在進行比較之前，此方法會將兩個 DateTimeOffset 物件的數值轉換為協調世界時（UTC）。此方法等同於以下方法：

return this.UtcDateTime == other.UtcDateTime;

this.UtcDateTime = other.UtcDateTime

Return Me.UtcDateTime = other.UtcDateTime

換句話說，該 Equals(DateTimeOffset) 方法判斷兩個 DateTimeOffset 物體是否代表同一時間點。它既不直接比較日期、時間，也不比對偏移量。要判斷兩個 DateTimeOffset 物件是否代表相同時間且偏移值相同，請使用該 EqualsExact 方法。

DateTimeOffset一個不是null的物體被視為比一個屬於null的物體晚（或更大）的。

這種方法的過載 Equals(DateTimeOffset) 實現了該 IEquatable<T>.Equals 方法。它比過載的效能 DateTimeOffset.Equals(Object) 略優，因為 other 參數不需要從物件轉換。

另請參閱

EqualsExact(DateTimeOffset)

適用於

Equals(Object)

判斷一個 DateTimeOffset 物體是否代表與指定物體相同的時間點。

public:
 override bool Equals(System::Object ^ obj);

public override bool Equals(object obj);

override this.Equals : obj -> bool

Public Overrides Function Equals (obj As Object) As Boolean

參數

obj: Object

要和當前 DateTimeOffset 物件比較的物件。

傳回

Boolean

true 若參數 obj 為 DateTimeOffset 物件且代表與當前 DateTimeOffset 物件相同的時間點;否則， false。

範例

以下範例顯示目前 DateTimeOffset 物件是否等於其他多個 DateTimeOffset 物件，以及空參考與物件 DateTime 。

private static void CompareForEquality2()
{
   DateTimeOffset firstTime = new DateTimeOffset(2007, 9, 1, 6, 45, 0,
                              new TimeSpan(-7, 0, 0));

   object secondTime = firstTime;
   Console.WriteLine("{0} = {1}: {2}",
                     firstTime, secondTime,
                     firstTime.Equals(secondTime));

   secondTime = new DateTimeOffset(2007, 9, 1, 6, 45, 0,
                    new TimeSpan(-6, 0, 0));
   Console.WriteLine("{0} = {1}: {2}",
                    firstTime, secondTime,
                    firstTime.Equals(secondTime));

   secondTime = new DateTimeOffset(2007, 9, 1, 8, 45, 0,
                    new TimeSpan(-5, 0, 0));
   Console.WriteLine("{0} = {1}: {2}",
                    firstTime, secondTime,
                    firstTime.Equals(secondTime));

   secondTime = null;
   Console.WriteLine("{0} = {1}: {2}",
                    firstTime, secondTime,
                    firstTime.Equals(secondTime));

   secondTime = new DateTime(2007, 9, 1, 6, 45, 00);
   Console.WriteLine("{0} = {1}: {2}",
                    firstTime, secondTime,
                    firstTime.Equals(secondTime));
   // The example displays the following output to the console:
   //       9/1/2007 6:45:00 AM -07:00 = 9/1/2007 6:45:00 AM -07:00: True
   //       9/1/2007 6:45:00 AM -07:00 = 9/1/2007 6:45:00 AM -06:00: False
   //       9/1/2007 6:45:00 AM -07:00 = 9/1/2007 8:45:00 AM -05:00: True
   //       9/1/2007 6:45:00 AM -07:00 = : False
   //       9/1/2007 6:45:00 AM -07:00 = 9/1/2007 6:45:00 AM: False

let compareForEquality2 () =
    let firstTime = DateTimeOffset(2007, 9, 1, 6, 45, 0, TimeSpan(-7, 0, 0))

    let secondTime: obj = firstTime
    printfn $"{firstTime} = {secondTime}: {firstTime.Equals secondTime}"

    let secondTime = DateTimeOffset(2007, 9, 1, 6, 45, 0, TimeSpan(-6, 0, 0))
    printfn $"{firstTime} = {secondTime}: {firstTime.Equals secondTime}"

    let secondTime = DateTimeOffset(2007, 9, 1, 8, 45, 0, TimeSpan(-5, 0, 0))
    printfn $"{firstTime} = {secondTime}: {firstTime.Equals secondTime}"

    let secondTime = null
    printfn $"{firstTime} = {secondTime}: {firstTime.Equals secondTime}"

    let secondTime = DateTime(2007, 9, 1, 6, 45, 00)
    printfn $"{firstTime} = {secondTime}: {firstTime.Equals secondTime}"
                    
    // The example displays the following output to the console:
    //       9/1/2007 6:45:00 AM -07:00 = 9/1/2007 6:45:00 AM -07:00: True
    //       9/1/2007 6:45:00 AM -07:00 = 9/1/2007 6:45:00 AM -06:00: False
    //       9/1/2007 6:45:00 AM -07:00 = 9/1/2007 8:45:00 AM -05:00: True
    //       9/1/2007 6:45:00 AM -07:00 = : False
    //       9/1/2007 6:45:00 AM -07:00 = 9/1/2007 6:45:00 AM: False

    Dim firstTime As New DateTimeOffset(#09/01/2007 6:45:00AM#, _
                     New TimeSpan(-7, 0, 0))

    Dim secondTime As Object = firstTime
    Console.WriteLine("{0} = {1}: {2}", _
                      firstTime, secondTime, _
                      firstTime.Equals(secondTime))

    secondTime = New DateTimeOffset(#09/01/2007 6:45:00AM#, _
                     New TimeSpan(-6, 0, 0))      
    Console.WriteLine("{0} = {1}: {2}", _
                     firstTime, secondTime, _
                     firstTime.Equals(secondTime))
    
    secondTime = New DateTimeOffset(#09/01/2007 8:45:00AM#, _
                     New TimeSpan(-5, 0, 0))
    Console.WriteLine("{0} = {1}: {2}", _
                     firstTime, secondTime, _
                     firstTime.Equals(secondTime))
                     
    secondTime = Nothing
    Console.WriteLine("{0} = {1}: {2}", _
                     firstTime, secondTime, _
                     firstTime.Equals(secondTime))

    secondTime = #9/1/2007 6:45AM#
    Console.WriteLine("{0} = {1}: {2}", _
                     firstTime, secondTime, _
                     firstTime.Equals(secondTime))
                                 
    ' The example displays the following output to the console:
    '       9/1/2007 6:45:00 AM -07:00 = 9/1/2007 6:45:00 AM -07:00: True  
    '       9/1/2007 6:45:00 AM -07:00 = 9/1/2007 6:45:00 AM -06:00: False 
    '       9/1/2007 6:45:00 AM -07:00 = 9/1/2007 8:45:00 AM -05:00: True  
    '       9/1/2007 6:45:00 AM -07:00 = : False                           
    '       9/1/2007 6:45:00 AM -07:00 = 9/1/2007 6:45:00 AM: False

備註

在進行比較前，此方法會將當前 DateTimeOffset 物件與 obj 參數的值轉換為協調世界時（UTC）。此方法等同於以下方法：

return this.UtcDateTime == ((DateTimeOffset) obj).UtcDateTime;

this.UtcDateTime = (obj :?> DateTimeOffset).UtcDateTime

Return Me.UtcDateTime = DirectCast(obj, DatetimeOffset).UtcDateTime

換句話說，該 DateTimeOffset.Equals(Object) 方法判斷當前 DateTimeOffset 物件與指定物件是否代表單一時間點。它既不直接比較日期、時間，也不比對偏移量。要判斷兩個 DateTimeOffset 物件是否代表相同時間且偏移值相同，請使用該 EqualsExact 方法。

若 obj 是 null，或的 obj 執行時類型不是 DateTimeOffset，則該方法回傳 false。

另請參閱

EqualsExact(DateTimeOffset)

適用於

Equals(DateTimeOffset, DateTimeOffset)

判斷兩個指定 DateTimeOffset 物件是否代表同一時間點。

public:
 static bool Equals(DateTimeOffset first, DateTimeOffset second);

public static bool Equals(DateTimeOffset first, DateTimeOffset second);

static member Equals : DateTimeOffset * DateTimeOffset -> bool

Public Shared Function Equals (first As DateTimeOffset, second As DateTimeOffset) As Boolean

參數

first: DateTimeOffset

第一個比較的對象。

second: DateTimeOffset

第二個比較物件。

傳回

Boolean

true 若兩個 DateTimeOffset 物件值相同 UtcDateTime ;否則， false。

範例

以下範例說明了該 Equals(DateTimeOffset, DateTimeOffset) 方法用來測試不同物件對 DateTimeOffset 是否相等的程序。

DateTimeOffset firstTime = new DateTimeOffset(2007, 11, 15, 11, 35, 00,
                                    DateTimeOffset.Now.Offset);
DateTimeOffset secondTime = firstTime;
Console.WriteLine("{0} = {1}: {2}",
                  firstTime, secondTime,
                  DateTimeOffset.Equals(firstTime, secondTime));

// The value of firstTime remains unchanged
secondTime = new DateTimeOffset(firstTime.DateTime,
             TimeSpan.FromHours(firstTime.Offset.Hours + 1));
Console.WriteLine("{0} = {1}: {2}",
                  firstTime, secondTime,
                  DateTimeOffset.Equals(firstTime, secondTime));

// value of firstTime remains unchanged
secondTime = new DateTimeOffset(firstTime.DateTime + TimeSpan.FromHours(1),
                                TimeSpan.FromHours(firstTime.Offset.Hours + 1));
Console.WriteLine("{0} = {1}: {2}",
                  firstTime, secondTime,
                  DateTimeOffset.Equals(firstTime, secondTime));
 // The example produces the following output:
 //       11/15/2007 11:35:00 AM -07:00 = 11/15/2007 11:35:00 AM -07:00: True
 //       11/15/2007 11:35:00 AM -07:00 = 11/15/2007 11:35:00 AM -06:00: False
 //       11/15/2007 11:35:00 AM -07:00 = 11/15/2007 12:35:00 PM -06:00: True

let firstTime = DateTimeOffset(2007, 11, 15, 11, 35, 00, DateTimeOffset.Now.Offset)
let secondTime = firstTime
printfn $"{firstTime} = {secondTime}: {DateTimeOffset.Equals(firstTime, secondTime)}"

// The value of firstTime remains unchanged
let secondTime = DateTimeOffset(firstTime.DateTime, TimeSpan.FromHours(firstTime.Offset.Hours + 1 |> float))
printfn $"{firstTime} = {secondTime}: {DateTimeOffset.Equals(firstTime, secondTime)}"

// value of firstTime remains unchanged
let secondTime = DateTimeOffset(firstTime.DateTime + TimeSpan.FromHours 1, TimeSpan.FromHours(firstTime.Offset.Hours + 1 |> float))
printfn $"{firstTime} = {secondTime}: {DateTimeOffset.Equals(firstTime, secondTime)}"

// The example produces the following output:
//       11/15/2007 11:35:00 AM -07:00 = 11/15/2007 11:35:00 AM -07:00: True
//       11/15/2007 11:35:00 AM -07:00 = 11/15/2007 11:35:00 AM -06:00: False
//       11/15/2007 11:35:00 AM -07:00 = 11/15/2007 12:35:00 PM -06:00: True

Dim firstTime As New DateTimeOffset(#11/15/2007 11:35AM#, _
                                    DateTimeOffset.Now.Offset)
Dim secondTime As DateTimeOffset = firstTime
Console.WriteLine("{0} = {1}: {2}", _
                  firstTime, secondTime, _
                  DateTimeOffset.Equals(firstTime, secondTime))

' The value of firstTime remains unchanged
secondTime = New DateTimeOffset(firstTime.DateTime, _
             TimeSpan.FromHours(firstTime.Offset.Hours + 1))      
Console.WriteLine("{0} = {1}: {2}", _
                  firstTime, secondTime, _
                  DateTimeOffset.Equals(firstTime, secondTime))

' value of firstTime remains unchanged
secondTime = New DateTimeOffset(firstTime.DateTime + TimeSpan.FromHours(1), _
                                TimeSpan.FromHours(firstTime.Offset.Hours + 1))
Console.WriteLine("{0} = {1}: {2}", _
                  firstTime, secondTime, _
                  DateTimeOffset.Equals(firstTime, secondTime))
 ' The example produces the following output:
 '       11/15/2007 11:35:00 AM -07:00 = 11/15/2007 11:35:00 AM -07:00: True
 '       11/15/2007 11:35:00 AM -07:00 = 11/15/2007 11:35:00 AM -06:00: False
 '       11/15/2007 11:35:00 AM -07:00 = 11/15/2007 12:35:00 PM -06:00: True

備註

在進行比較之前，此方法會先將兩個 DateTimeOffset 物件轉換成協調世界時（UTC）。此方法等同於以下方法：

return first.UtcDateTime == second.UtcDateTime;

first.UtcDateTime = second.UtcDateTime

Return first.UtcDateTime = second.UtcDateTime

換句話說，該 Equals(DateTimeOffset, DateTimeOffset) 方法判斷這兩個 DateTimeOffset 物件是否代表同一時間點。它既不直接比較日期、時間，也不比對偏移量。要判斷兩個 DateTimeOffset 物件是否代表相同時間且偏移值相同，請使用該 EqualsExact 方法。

另請參閱

EqualsExact(DateTimeOffset)

適用於

意見反應

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