StringBuilder 類別

定義

public ref class StringBuilder sealed

public ref class StringBuilder sealed : System::Runtime::Serialization::ISerializable

public sealed class StringBuilder

[System.Serializable]
public sealed class StringBuilder

[System.Serializable]
[System.Runtime.InteropServices.ComVisible(true)]
public sealed class StringBuilder : System.Runtime.Serialization.ISerializable

public sealed class StringBuilder : System.Runtime.Serialization.ISerializable

type StringBuilder = class

[<System.Serializable>]
type StringBuilder = class

[<System.Serializable>]
[<System.Runtime.InteropServices.ComVisible(true)>]
type StringBuilder = class
    interface ISerializable

type StringBuilder = class
    interface ISerializable

Public NotInheritable Class StringBuilder

Public NotInheritable Class StringBuilder
Implements ISerializable

繼承

Object

StringBuilder

屬性

SerializableAttribute ComVisibleAttribute

實作

ISerializable

範例

以下範例展示了如何呼叫該類別定義的 StringBuilder 許多方法。

using System;
using System.Text;

public sealed class App
{
    static void Main()
    {
        // Create a StringBuilder that expects to hold 50 characters.
        // Initialize the StringBuilder with "ABC".
        StringBuilder sb = new StringBuilder("ABC", 50);

        // Append three characters (D, E, and F) to the end of the StringBuilder.
        sb.Append(new char[] { 'D', 'E', 'F' });

        // Append a format string to the end of the StringBuilder.
        sb.AppendFormat("GHI{0}{1}", 'J', 'k');

        // Display the number of characters in the StringBuilder and its string.
        Console.WriteLine("{0} chars: {1}", sb.Length, sb.ToString());

        // Insert a string at the beginning of the StringBuilder.
        sb.Insert(0, "Alphabet: ");

        // Replace all lowercase k's with uppercase K's.
        sb.Replace('k', 'K');

        // Display the number of characters in the StringBuilder and its string.
        Console.WriteLine("{0} chars: {1}", sb.Length, sb.ToString());
    }
}

// This code produces the following output.
//
// 11 chars: ABCDEFGHIJk
// 21 chars: Alphabet: ABCDEFGHIJK

open System.Text

// Create a StringBuilder that expects to hold 50 characters.
// Initialize the StringBuilder with "ABC".
let sb = StringBuilder("ABC", 50)

// Append three characters (D, E, and F) to the end of the StringBuilder.
sb.Append [| 'D'; 'E'; 'F' |] |> ignore

// Append a format string to the end of the StringBuilder.
sb.AppendFormat("GHI{0}{1}", 'J', 'k') |> ignore

// Display the number of characters in the StringBuilder and its string.
printfn $"{sb.Length} chars: {sb}"

// Insert a string at the beginning of the StringBuilder.
sb.Insert(0, "Alphabet: ") |> ignore

// Replace all lowercase k's with uppercase K's.
sb.Replace('k', 'K') |> ignore

// Display the number of characters in the StringBuilder and its string.
printfn $"{sb.Length} chars: {sb}"

// This code produces the following output.
//
// 11 chars: ABCDEFGHIJk
// 21 chars: Alphabet: ABCDEFGHIJK

Imports System.Text

Public Module App 
    Public Sub Main() 
        ' Create a StringBuilder that expects to hold 50 characters.
        ' Initialize the StringBuilder with "ABC".
        Dim sb As New StringBuilder("ABC", 50)

        ' Append three characters (D, E, and F) to the end of the StringBuilder.
        sb.Append(New Char() {"D"c, "E"c, "F"c})

        ' Append a format string to the end of the StringBuilder.
        sb.AppendFormat("GHI{0}{1}", "J"c, "k"c)

        ' Display the number of characters in the StringBuilder and its string.
        Console.WriteLine("{0} chars: {1}", sb.Length, sb.ToString())

        ' Insert a string at the beginning of the StringBuilder.
        sb.Insert(0, "Alphabet: ")

        ' Replace all lowercase k's with uppercase K's.
        sb.Replace("k", "K")

        ' Display the number of characters in the StringBuilder and its string.
        Console.WriteLine("{0} chars: {1}", sb.Length, sb.ToString())
    End Sub
End Module

' This code produces the following output.
'
' 11 chars: ABCDEFGHIJk
' 21 chars: Alphabet: ABCDEFGHIJK

備註

欲了解更多關於此 API 的資訊，請參閱 StringBuilder 的補充 API 備註。

給呼叫者的注意事項

在 .NET Core 及 .NET Framework 4.0 及後續版本中，當你呼叫 StringBuilder(Int32, Int32) 建構子實例化 StringBuilder 物件時，StringBuilder 實例的長度與容量都可能超過其 MaxCapacity 屬性的值。 這種情況尤其可能發生在你呼叫 和 Append(String)AppendFormat(String, Object) 方法來附加小字串時。

另請參閱

• String