Removes all trailing occurrences of a set of characters specified in an array from the current String object.
Assembly: mscorlib (in mscorlib.dll)
- Type: System.Char
An array of Unicode characters to remove, or a null reference (Nothing in Visual Basic).
Return ValueType: System.String
The string that remains after all occurrences of the characters in the trimChars parameter are removed from the end of the current string. If trimChars is a null reference (Nothing in Visual Basic) or an empty array, Unicode white-space characters are removed instead.
The method removes from the current string all trailing characters that are in the trimChars parameter. The trim operation stops when the first character that is not in trimChars is encountered at the end of the string. For example, if the current string is "123abc456xyz789" and trimChars contains the digits from "1" through "9", the method returns "123abc456xyz".
This method does not modify the value of the current instance. Instead, it returns a new string in which all trailing characters found in trimChars are removed from the current string.
The .NET Framework 3.5 SP1 and earlier versions maintains an internal list of white-space characters that this method trims if trimChars is a null reference (Nothing in Visual Basic) or an empty array. Starting with the .NET Framework 4, if trimChars is a null reference (Nothing in Visual Basic) 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 Char.IsWhiteSpace 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 4 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).
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.