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StringBuilder.Replace Method (Char, Char, Int32, Int32)

Replaces, within a substring of this instance, all occurrences of a specified character with another specified character.

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

Public Function Replace ( _
	oldChar As Char, _
	newChar As Char, _
	startIndex As Integer, _
	count As Integer _
) As StringBuilder


Type: System.Char

The character to replace.

Type: System.Char

The character that replaces oldChar.

Type: System.Int32

The position in this instance where the substring begins.

Type: System.Int32

The length of the substring.

Return Value

Type: System.Text.StringBuilder
A reference to this instance with oldChar replaced by newChar in the range from startIndex to startIndex + count -1.


startIndex + count is greater than the length of the value of this instance.


startIndex or count is less than zero.

This method performs an ordinal, case-sensitive comparison to identify occurrences of oldChar in the current instance. The size of the current StringBuilder object is unchanged after the replacement.

The following example demonstrates the Replace method.

Imports System
Imports System.Text

Class Sample
   Public Shared Sub Main()
      '                    0----+----1----+----2----+----3----+----4--- 
      '                    01234567890123456789012345678901234567890123 
      Dim str As String = "The quick br!wn d#g jumps #ver the lazy cat." 
      Dim sb As New StringBuilder(str)

      Console.WriteLine("StringBuilder.Replace method")

      Console.WriteLine("Original value:")

      sb.Replace("#"c, "!"c, 15, 29)   ' Some '#' -> '!'
      sb.Replace("!"c, "o"c)           ' All '!' -> 'o'
      sb.Replace("cat", "dog")         ' All "cat" -> "dog"
      sb.Replace("dog", "fox", 15, 20) ' Some "dog" -> "fox"
      Console.WriteLine("Final value:")
   End Sub 'Main

   Public Shared Sub Show(sbs As StringBuilder)
      Dim rule1 As String = "0----+----1----+----2----+----3----+----4---" 
      Dim rule2 As String = "01234567890123456789012345678901234567890123"

      Console.WriteLine("{0}", sbs.ToString())
   End Sub 'Show
End Class 'Sample

'This example produces the following results: 

'StringBuilder.Replace method 

'Original value: 
'The quick br!wn d#g jumps #ver the lazy cat. 

'The quick br!wn d!g jumps !ver the lazy cat. 

'The quick brown dog jumps over the lazy cat. 

'The quick brown dog jumps over the lazy dog. 

'Final value: 
'The quick brown fox jumps over the lazy dog. 

.NET Framework

Supported in: 4.5.2, 4.5.1, 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

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone 8, Silverlight 8.1

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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