StringBuilder.Replace Method (Char, Char)

July 28, 2014

Replaces all occurrences of a specified character in this instance with another specified character.

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

public StringBuilder Replace(
	char oldChar,
	char newChar
)

Parameters

oldChar
Type: System.Char
The character to replace.
newChar
Type: System.Char
The character that replaces oldChar.

Return Value

Type: System.Text.StringBuilder
A reference to this instance with oldChar replaced by newChar.

A StringBuilder with all instances of oldChar replaced with newChar. The size of the StringBuilder is unchanged because characters are only replaced. This method is case-sensitive.

The following code example demonstrates the Replace method.


using System;
using System.Text;

class Example
{
   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
   {
      //                0----+----1----+----2----+----3----+----4---
      //                01234567890123456789012345678901234567890123
      string str = "The quick br!wn d#g jumps #ver the lazy cat.";
      StringBuilder sb = new StringBuilder(str);

      outputBlock.Text += "\n";
      outputBlock.Text += "StringBuilder.Replace method" + "\n";
      outputBlock.Text += "\n";

      outputBlock.Text += "Original value:" + "\n";
      Show(outputBlock, sb);

      sb.Replace('#', '!', 15, 29);        // Some '#' -> '!'
      Show(outputBlock, sb);
      sb.Replace('!', 'o');                // All '!' -> 'o'
      Show(outputBlock, sb);
      sb.Replace("cat", "dog");            // All "cat" -> "dog"
      Show(outputBlock, sb);
      sb.Replace("dog", "fox", 15, 20);    // Some "dog" -> "fox"

      outputBlock.Text += "Final value:" + "\n";
      Show(outputBlock, sb);
   }

   public static void Show(System.Windows.Controls.TextBlock outputBlock, StringBuilder sbs)
   {
      string rule1 = "0----+----1----+----2----+----3----+----4---";
      string rule2 = "01234567890123456789012345678901234567890123";

      outputBlock.Text += rule1 + "\n";
      outputBlock.Text += rule2 + "\n";
      outputBlock.Text += String.Format("{0}", sbs.ToString()) + "\n";
      outputBlock.Text += "\n";
   }
}
/*
This example produces the following results:

StringBuilder.Replace method

Original value:
0----+----1----+----2----+----3----+----4---
01234567890123456789012345678901234567890123
The quick br!wn d#g jumps #ver the lazy cat.

0----+----1----+----2----+----3----+----4---
01234567890123456789012345678901234567890123
The quick br!wn d!g jumps !ver the lazy cat.

0----+----1----+----2----+----3----+----4---
01234567890123456789012345678901234567890123
The quick brown dog jumps over the lazy cat.

0----+----1----+----2----+----3----+----4---
01234567890123456789012345678901234567890123
The quick brown dog jumps over the lazy dog.

Final value:
0----+----1----+----2----+----3----+----4---
01234567890123456789012345678901234567890123
The quick brown fox jumps over the lazy dog.

*/


Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

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