String.IsNullOrWhiteSpace Method (String)

 

Indicates whether a specified string is null, empty, or consists only of white-space characters.

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

static member IsNullOrWhiteSpace : 
        value:string -> bool

Parameters

value
Type: System.String

The string to test.

Return Value

Type: System.Boolean

true if the value parameter is null or String.Empty, or if value consists exclusively of white-space characters.

IsNullOrWhiteSpace is a convenience method that is similar to the following code, except that it offers superior performance:

No code example is currently available or this language may not be supported.

White-space characters are defined by the Unicode standard. The IsNullOrWhiteSpace method interprets any character that returns a value of true when it is passed to the Char.IsWhiteSpace method as a white-space character.

The following example creates a string array, and then passes each element of the array to the IsNullOrWhiteSpace method.

No code example is currently available or this language may not be supported.

Universal Windows Platform
Available since 8
.NET Framework
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 4.0
Windows Phone Silverlight
Available since 7.1
Windows Phone
Available since 8.1
Return to top
Show: