String.Replace 方法

public:
 System::String ^ Replace(char oldChar, char newChar);

public string Replace(char oldChar, char newChar);

member this.Replace : char * char -> string

Public Function Replace (oldChar As Char, newChar As Char) As String

参数

返回

一个等效于此实例的字符串，只不过所有实例 oldChar 都替换为 newChar。 如果在 oldChar 当前实例中找不到，该方法将返回未更改的当前实例。

示例

以下示例通过替换一系列数字之间的空白来创建逗号分隔值列表。

string str = "1 2 3 4 5 6 7 8 9";
Console.WriteLine($"Original string: \"{str}\"");
Console.WriteLine($"CSV string:      \"{str.Replace(' ', ',')}\"");

// This example produces the following output:
// Original string: "1 2 3 4 5 6 7 8 9"
// CSV string:      "1,2,3,4,5,6,7,8,9"

let str = "1 2 3 4 5 6 7 8 9"
printfn $"Original string: \"{str}\""
printfn $"CSV string:      \"{str.Replace(' ', ',')}\""

// This example produces the following output:
// Original string: "1 2 3 4 5 6 7 8 9"
// CSV string:      "1,2,3,4,5,6,7,8,9"

Class stringReplace1
   Public Shared Sub Main()
      Dim str As [String] = "1 2 3 4 5 6 7 8 9"
      Console.WriteLine("Original string: ""{0}""", str)
      Console.WriteLine("CSV string:      ""{0}""", str.Replace(" "c, ","c))
   End Sub
End Class
' This example produces the following output:
' Original string: "1 2 3 4 5 6 7 8 9"
' CSV string:      "1,2,3,4,5,6,7,8,9"

注解

此方法执行序号（区分大小写和不区分区域性）搜索以查找 oldChar。

由于此方法返回修改后的字符串，因此可以将对该方法的连续调用 Replace 链接在一起，以对原始字符串执行多个替换。 方法调用从左到右执行。 下面的示例进行了这方面的演示。

string s = new('a', 3);
Console.WriteLine($"The initial string: '{s}'");
s = s.Replace('a', 'b').Replace('b', 'c').Replace('c', 'd');
Console.WriteLine($"The final string: '{s}'");

// The example displays the following output:
//       The initial string: 'aaa'
//       The final string: 'ddd'

let s = new string('a', 3)
printfn $"The initial string: '{s}'"
let s2 = s.Replace('a', 'b').Replace('b', 'c').Replace('c', 'd')
printfn $"The final string: '{s2}'"

// The example displays the following output:
//       The initial string: 'aaa'
//       The final string: 'ddd'

Module Example
   Public Sub Main()
      Dim s As New String("a"c, 3)
      Console.WriteLine("The initial string: '{0}'", s)
      s = s.Replace("a"c, "b"c).Replace("b"c, "c"c).Replace("c"c, "d"c)
      Console.WriteLine("The final string: '{0}'", s)
   End Sub
End Module
' The example displays the following output:
'       The initial string: 'aaa'
'       The final string: 'ddd'

另请参阅

• Char
• Concat(Object)
• Insert(Int32, String)
• Join(String, String[])
• Remove(Int32, Int32)
• Split(Char[])
• Substring(Int32)
• Trim(Char[])

public:
 System::String ^ Replace(System::String ^ oldValue, System::String ^ newValue);

public string Replace(string oldValue, string newValue);

member this.Replace : string * string -> string

Public Function Replace (oldValue As String, newValue As String) As String

参数

返回

与当前字符串等效的字符串，只不过所有实例 oldValue 都替换为 newValue。 如果在 oldValue 当前实例中找不到，该方法将返回未更改的当前实例。

例外

示例

以下示例演示如何使用 Replace 该方法更正拼写错误。

string errString = "This docment uses 3 other docments to docment the docmentation";

Console.WriteLine($"The original string is:{Environment.NewLine}'{errString}'{Environment.NewLine}");

// Correct the spelling of "document".
string correctString = errString.Replace("docment", "document");

Console.WriteLine($"After correcting the string, the result is:{Environment.NewLine}'{correctString}'");

// This code example produces the following output:
//
// The original string is:
// 'This docment uses 3 other docments to docment the docmentation'
//
// After correcting the string, the result is:
// 'This document uses 3 other documents to document the documentation'
//

open System

let errString = "This docment uses 3 other docments to docment the docmentation"

printfn $"The original string is:{Environment.NewLine}'{errString}'{Environment.NewLine}"

// Correct the spelling of "document".

let correctString = errString.Replace("docment", "document")

printfn $"After correcting the string, the result is:{Environment.NewLine}'{correctString}'"

// This code example produces the following output:
//
// The original string is:
// 'This docment uses 3 other docments to docment the docmentation'
//
// After correcting the string, the result is:
// 'This document uses 3 other documents to document the documentation'
//

Public Class ReplaceTest
    
    Public Shared Sub Main()
        Dim errString As String = "This docment uses 3 other docments to docment the docmentation"
                
        Console.WriteLine("The original string is:{0}'{1}'{0}", Environment.NewLine, errString)

        ' Correct the spelling of "document".  
        Dim correctString As String = errString.Replace("docment", "document")
      
        Console.WriteLine("After correcting the string, the result is:{0}'{1}'", Environment.NewLine, correctString)
    End Sub
End Class
'
' This code example produces the following output:
'
' The original string is:
' 'This docment uses 3 other docments to docment the docmentation'
'
' After correcting the string, the result is:
' 'This document uses 3 other documents to document the documentation'
'

注解

如果是newValue，则会删除所有匹配项oldValue。null

此方法执行序号（区分大小写和不区分区域性）搜索以查找 oldValue。

由于此方法返回修改后的字符串，因此可以将对该方法的连续调用 Replace 链接在一起，以对原始字符串执行多个替换。 方法调用从左到右执行。 下面的示例进行了这方面的演示。

string s = "aaa";
Console.WriteLine($"The initial string: '{s}'");
s = s.Replace("a", "b").Replace("b", "c").Replace("c", "d");
Console.WriteLine($"The final string: '{s}'");

// The example displays the following output:
//       The initial string: 'aaa'
//       The final string: 'ddd'

let s = "aaa"
printfn $"The initial string: '{s}'"
let s2 = s.Replace("a", "b").Replace("b", "c").Replace("c", "d")
printfn $"The final string: '{s2}'"

// The example displays the following output:
//       The initial string: 'aaa'
//       The final string: 'ddd'

Module Example
   Public Sub Main()
      Dim s As String = "aaa"
      Console.WriteLine("The initial string: '{0}'", s)
      s = s.Replace("a", "b").Replace("b", "c").Replace("c", "d")
      Console.WriteLine("The final string: '{0}'", s)
   End Sub
End Module
' The example displays the following output:
'       The initial string: 'aaa'
'       The final string: 'ddd'

另请参阅

• Concat(Object)
• Insert(Int32, String)
• Join(String, String[])
• Remove(Int32, Int32)
• Split(Char[])
• Substring(Int32)
• Trim(Char[])

public:
 System::String ^ Replace(System::String ^ oldValue, System::String ^ newValue, StringComparison comparisonType);

public string Replace(string oldValue, string newValue, StringComparison comparisonType);

member this.Replace : string * string * StringComparison -> string

Public Function Replace (oldValue As String, newValue As String, comparisonType As StringComparison) As String

参数

返回

与当前字符串等效的字符串，只不过所有实例 oldValue 都替换为 newValue。 如果在 oldValue 当前实例中找不到，该方法将返回未更改的当前实例。

例外

注解

如果是newValue，则会删除所有匹配项oldValue。null

此方法执行搜索以使用按comparisonType区域性和区分大小写进行查找oldValue。

由于此方法返回修改后的字符串，因此可以将对该方法的连续调用 Replace 链接在一起，以对原始字符串执行多个替换。 方法调用从左到右执行。 下面的示例进行了这方面的演示。

string s = "aaa";
Console.WriteLine($"The initial string: '{s}'");
s = s.Replace("a", "b").Replace("b", "c").Replace("c", "d");
Console.WriteLine($"The final string: '{s}'");

// The example displays the following output:
//       The initial string: 'aaa'
//       The final string: 'ddd'

let s = "aaa"
printfn $"The initial string: '{s}'"
let s2 = s.Replace("a", "b").Replace("b", "c").Replace("c", "d")
printfn $"The final string: '{s2}'"

// The example displays the following output:
//       The initial string: 'aaa'
//       The final string: 'ddd'

Module Example
   Public Sub Main()
      Dim s As String = "aaa"
      Console.WriteLine("The initial string: '{0}'", s)
      s = s.Replace("a", "b").Replace("b", "c").Replace("c", "d")
      Console.WriteLine("The final string: '{0}'", s)
   End Sub
End Module
' The example displays the following output:
'       The initial string: 'aaa'
'       The final string: 'ddd'

public:
 System::String ^ Replace(System::String ^ oldValue, System::String ^ newValue, bool ignoreCase, System::Globalization::CultureInfo ^ culture);

public string Replace(string oldValue, string newValue, bool ignoreCase, System.Globalization.CultureInfo culture);

member this.Replace : string * string * bool * System.Globalization.CultureInfo -> string

Public Function Replace (oldValue As String, newValue As String, ignoreCase As Boolean, culture As CultureInfo) As String

参数

返回

与当前字符串等效的字符串，只不过所有实例 oldValue 都替换为 newValue。 如果在 oldValue 当前实例中找不到，该方法将返回未更改的当前实例。

例外

注解

如果是newValue，则会删除所有匹配项oldValue。null

此方法执行搜索以使用提供的culture和ignoreCase区分大小写进行查找oldValue。

由于此方法返回修改后的字符串，因此可以将对该方法的连续调用 Replace 链接在一起，以对原始字符串执行多个替换。 方法调用从左到右执行。 下面的示例进行了这方面的演示。

string s = "aaa";
Console.WriteLine($"The initial string: '{s}'");
s = s.Replace("a", "b").Replace("b", "c").Replace("c", "d");
Console.WriteLine($"The final string: '{s}'");

// The example displays the following output:
//       The initial string: 'aaa'
//       The final string: 'ddd'

let s = "aaa"
printfn $"The initial string: '{s}'"
let s2 = s.Replace("a", "b").Replace("b", "c").Replace("c", "d")
printfn $"The final string: '{s2}'"

// The example displays the following output:
//       The initial string: 'aaa'
//       The final string: 'ddd'

Module Example
   Public Sub Main()
      Dim s As String = "aaa"
      Console.WriteLine("The initial string: '{0}'", s)
      s = s.Replace("a", "b").Replace("b", "c").Replace("c", "d")
      Console.WriteLine("The final string: '{0}'", s)
   End Sub
End Module
' The example displays the following output:
'       The initial string: 'aaa'
'       The final string: 'ddd'