IsLower Method (String, Int32)
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Char.IsLower Method (String, Int32)

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Indicates whether the character at the specified position in a specified string is categorized as a lowercase letter.

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

'Declaration
Public Shared Function IsLower ( _
	s As String, _
	index As Integer _
) As Boolean

Parameters

s
Type: System.String
A string.
index
Type: System.Int32
The character position in s.

Return Value

Type: System.Boolean
true if the character at position index in s is a lowercase letter; otherwise, false.

ExceptionCondition
ArgumentNullException

s is Nothing.

ArgumentOutOfRangeException

index is less than zero or greater than the last position in s.

Character positions in a string are indexed starting from zero.

Valid lowercase letters are members of the following category in UnicodeCategory: LowercaseLetter.

The following example demonstrates IsLower.



Module Example

   Public Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)

      Dim ch As Char
      ch = "a"c

      outputBlock.Text &= Char.IsLower(ch) & vbCrLf                 ' Output: "True"
      outputBlock.Text += String.Format(Char.IsLower("upperCase", 5)) & vbCrLf     ' Output: "False"

   End Sub

End Module


Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

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