Replace Method (Char, Char, Int32, Int32)

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:
StringBuilder^ Replace(
	wchar_t oldChar,
	wchar_t newChar,
	int startIndex,
	int count
)

Parameters

oldChar
Type: System::Char

The character to replace.

newChar
Type: System::Char

The character that replaces oldChar.

startIndex
Type: System::Int32

The position in this instance where the substring begins.

count
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.

Exception Condition
ArgumentOutOfRangeException

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

-or-

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.

using namespace System;
using namespace System::Text;
void Show( StringBuilder^ sbs )
{
   String^ rule1 = "0----+----1----+----2----+----3----+----4---";
   String^ rule2 = "01234567890123456789012345678901234567890123";
   Console::WriteLine( rule1 );
   Console::WriteLine( rule2 );
   Console::WriteLine( "{0}", sbs );
   Console::WriteLine();
}

int main()
{

   //                  0----+----1----+----2----+----3----+----4---
   //                  01234567890123456789012345678901234567890123
   String^ str = "The quick br!wn d#g jumps #ver the lazy cat.";
   StringBuilder^ sb = gcnew StringBuilder( str );
   Console::WriteLine();
   Console::WriteLine( "StringBuilder.Replace method" );
   Console::WriteLine();
   Console::WriteLine( "Original value:" );
   Show( sb );
   sb->Replace( '#', '!', 15, 29 ); // Some '#' -> '!'
   Show( sb );
   sb->Replace( '!', 'o' ); // All '!' -> 'o'
   Show( sb );
   sb->Replace( "cat", "dog" ); // All "cat" -> "dog"
   Show( sb );
   sb->Replace( "dog", "fox", 15, 20 ); // Some "dog" -> "fox"
   Console::WriteLine( "Final value:" );
   Show( sb );
}

/*
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.

*/

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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