Removes all leading and trailing occurrences of a set of characters specified in an array from the current string.
public:
System::String ^ Trim(... cli::array <char> ^ trimChars);
public string Trim (params char[] trimChars);
public string Trim (params char[]? trimChars);
member this.Trim : char[] -> string
Public Function Trim (ParamArray trimChars As Char()) As String
Tóm Tắt
Parameters
-
trimChars
- Char[]
An array of Unicode characters to remove, or null
.
Returns
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 null
or an empty array, white-space characters are removed instead. If no characters can be trimmed from the current instance, the method returns the current instance unchanged.
Examples
The following example uses the Trim(System.Char[])
method to remove space, asterisk (*), and apostrophe (‘) characters from a string.
using namespace System;
void main()
{
array<Char>^ charsToTrim = { L'*', L' ', L'\\' };
String^ banner = "*** Much Ado About Nothing ***";
String^ result = banner->Trim(charsToTrim);
Console::WriteLine("Trimmmed\n {0}\nto\n '{1}'", banner, result);
}
// The example displays the following output:
// Trimmmed
// *** Much Ado About Nothing ***
// to
// 'Much Ado About Nothing'
char[] charsToTrim = { '*', ' ', '\''};
string banner = "*** Much Ado About Nothing ***";
string result = banner.Trim(charsToTrim);
Console.WriteLine("Trimmed\n {0}\nto\n '{1}'", banner, result);
// The example displays the following output:
// Trimmed
// *** Much Ado About Nothing ***
// to
// 'Much Ado About Nothing'
let charsToTrim = [| '*'; ' '; '\'' |]
let banner = "*** Much Ado About Nothing ***"
let result = banner.Trim charsToTrim
printfn $"Trimmmed\n {banner}\nto\n '{result}'"
// The example displays the following output:
// Trimmmed
// *** Much Ado About Nothing ***
// to
// 'Much Ado About Nothing'
Module Example
Public Sub Main()
Dim charsToTrim() As Char = { "*"c, " "c, "'"c}
Dim banner As String = "*** Much Ado About Nothing ***"
Dim result As String = banner.Trim(charsToTrim)
Console.WriteLine("Trimmmed{0} {1}{0}to{0} '{2}'", _
vbCrLf, banner, result)
End Sub
End Module
' The example displays the following output:
' Trimmmed
' *** Much Ado About Nothing ***
' to
' 'Much Ado About Nothing'
Remarks
The Trim(System.Char[])
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(System.Char[])
method returns “abc456xyz”.
Note
If the Trim(System.Char[])
method removes any characters from the current instance, 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.
If the current string equals Empty or all the characters in the current instance consist of characters in the trimChars
array, the method returns Empty.
If trimChars
is null
or an empty array, this method removes any leading or trailing characters that result in the method returning true
when they are passed to the Char.IsWhiteSpace method.
Notes to Callers
The .NET Framework 3.5 SP1 and earlier versions maintains an internal list of white-space characters that this method trims if trimChars
is null
or an empty array. Starting with the .NET Framework 4, if trimChars
is null
or an empty array, the method trims all Unicode white-space characters (that is, characters that produce a true
return value when they are passed to the IsWhiteSpace(Char) method). Because of this change, the Trim() method in the .NET Framework 3.5 SP1 and earlier versions removes two characters, ZERO WIDTH SPACE (U+200B) and ZERO WIDTH NO-BREAK SPACE (U+FEFF), that the Trim() method in the .NET Framework 4and later versions does not remove. In addition, the Trim() method in the .NET Framework 3.5 SP1 and earlier versions does not trim three Unicode white-space characters: MONGOLIAN VOWEL SEPARATOR (U+180E), NARROW NO-BREAK SPACE (U+202F), and MEDIUM MATHEMATICAL SPACE (U+205F).