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String.Replace Method (Char, Char)

Returns a new string in which all occurrences of a specified Unicode character in this instance are replaced with another specified Unicode character.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

public string Replace(
	char oldChar,
	char newChar
)

Parameters

oldChar
Type: System.Char

The Unicode character to be replaced.

newChar
Type: System.Char

The Unicode character to replace all occurrences of oldChar.

Return Value

Type: System.String
A string that is equivalent to this instance except that all instances of oldChar are replaced with newChar. If oldChar is not found in the current instance, the method returns the current instance unchanged.

This method performs an ordinal (case-sensitive and culture-insensitive) search to find oldChar.

NoteNote

This method does not modify the value of the current instance. Instead, it returns a new string in which all occurrences of oldChar are replaced by newChar.

Because this method returns the modified string, you can chain together successive calls to the Replace method to perform multiple replacements on the original string. Method calls are executed from left to right. The following example provides an illustration.

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'

The following example creates a comma separated value list by substituting commas for the blanks between a series of numbers.

using System;

class stringReplace1 {
    public static void Main() {
        String str = "1 2 3 4 5 6 7 8 9";
        Console.WriteLine("Original string: \"{0}\"", str);
        Console.WriteLine("CSV string:      \"{0}\"", 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" 
//

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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