Articolo
11/18/2011

String.Trim Method (array<Char[])

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Removes all leading and trailing occurrences of a set of characters specified in an array from the current string.

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

Syntax

'Declaration
Public Function Trim ( _
    ParamArray trimChars As Char() _
) As String

public string Trim(
    params char[] trimChars
)

Parameters

trimChars
Type: array<System.Char[]
An array of Unicode characters to remove or nulla null reference (Nothing in Visual Basic).

Return Value

Type: System.String
The string that remains after all occurrences of the characters in the trimChars parameter are removed from the start and end of the current string. If trimChars is nulla null reference (Nothing in Visual Basic) or an empty array, white-space characters are removed instead.

Remarks

The Trim method removes from the current string all leading and trailing characters that are in the trimChars parameter. Each leading and trailing trim operation stops when a character that is not in trimChars is encountered. For example, if the current string is "123abc456xyz789" and trimChars contains the digits from '1' through '9', the Trim method returns "abc456xyz".

Note:
This method does not modify the value of the current instance. Instead, it returns a new string in which all leading and trailing trimChars characters found in the current instance are removed.

For more information about which Unicode characters are categorized as white-space characters, see the Remarks section of the String.Trim() method overload.

Examples

The following example uses the String.Trim(array<Char[]) method to remove any space, asterisk (*), and apostrophe (') characters from a string.

Module Example
   Public Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
      Dim charsToTrim() As Char = {"*"c, " "c, "'"c}
      Dim banner As String = "*** Much Ado About Nothing ***"
      Dim result As String = banner.Trim(charsToTrim)
      outputBlock.Text += String.Format("Trimmmed{0}   {1}{0}to{0}   '{2}'", _
                        vbCrLf, banner, result) & vbCrLf
   End Sub
End Module
' The example displays the following output:
'       Trimmmed
'          *** Much Ado About Nothing ***
'       to
'          'Much Ado About Nothing'

using System;

public class Example
{
   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
   {
      char[] charsToTrim = { '*', ' ', '\'' };
      string banner = "*** Much Ado About Nothing ***";
      string result = banner.Trim(charsToTrim);
      outputBlock.Text += String.Format("Trimmmed\n   {0}\nto\n   '{1}'", banner, result) + "\n";
   }
}
// The example displays the following output:
//       Trimmmed
//          *** Much Ado About Nothing ***
//       to
//          'Much Ado About Nothing'

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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