Interesting .Net 4 thing of the day: String.IsNullOrWhiteSpace()

Sunday, November 01, 2009

Interesting .Net 4 thing of the day: String.IsNullOrWhiteSpace()

MSDN Library - String.IsNullOrWhiteSpace Method

“Indicates whether a specified string is Null reference (Nothing in Visual Basic), empty, or consists only of white-space characters.

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IsNullOrWhiteSpace is a convenience method that is equivalent to calling the Trim() method followed by the IsNullOrEmpty method.

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

Module Example
   Public Sub Main()
      Dim values() As String = { Nothing, String.Empty, "ABCDE",
                                 New String(" "c, 20), " " + vbTab + "   ",
                                 New String(ChrW(&h2000), 10) }
      For Each value As String In values
         Console.WriteLine(String.IsNullOrWhiteSpace(value))
      Next
   End Sub
End Module
' The example displays the following output:
'       True
'       True
'       False
'       True
'       True
'       True

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