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Char.IsLower Method (String, Int32)

Microsoft Silverlight will reach end of support after October 2021. Learn more.

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)

Syntax

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

public static bool IsLower(
    string s,
    int index
)

Parameters

Return Value

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

Exceptions

Exception Condition
ArgumentNullException

s is nulla null reference (Nothing in Visual Basic).
ArgumentOutOfRangeException

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

Remarks

Character positions in a string are indexed starting from zero.

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

Examples

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

using System;

public class Example
{
   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
   {
      char ch = 'a';

      outputBlock.Text += Char.IsLower(ch).ToString() + "\n";               
      outputBlock.Text += Char.IsLower("upperCase", 5).ToString() + "\n";   
   }
}
// The example produces the following output:
//    True
//    False

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.