Char.IsLetterOrDigit Method (Char)
Microsoft Silverlight will reach end of support after October 2021. Learn more.
Indicates whether the specified Unicode character is categorized as a letter or a decimal digit.
Namespace: System
Assembly: mscorlib (in mscorlib.dll)
Syntax
'Declaration
Public Shared Function IsLetterOrDigit ( _
c As Char _
) As Boolean
public static bool IsLetterOrDigit(
char c
)
Parameters
- c
Type: System.Char
The Unicode character to evaluate.
Return Value
Type: System.Boolean
true if c is a letter or a decimal digit; otherwise, false.
Remarks
Valid alphabetic letters and decimal digits are members of the following categories in UnicodeCategory: UppercaseLetter, LowercaseLetter, TitlecaseLetter, ModifierLetter, OtherLetter, or DecimalDigitNumber.
Examples
The following example demonstrates IsLetterOrDigit.
Module Example
Public Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
Dim str As String
str = "newline:" + vbNewLine
outputBlock.Text &= Char.IsLetterOrDigit("8"c) & vbCrLf ' Output: "True"
outputBlock.Text += String.Format(Char.IsLetterOrDigit(str, 8)) & vbCrLf ' Output: "False", because it's a NewLine
End Sub
End Module
using System;
public class Example
{
public static void Demo(System.Windows.Controls.TextBlock outputBlock)
{
string str = "newline:\n";
outputBlock.Text += Char.IsLetterOrDigit('8').ToString() + "\n";
outputBlock.Text += (Char.IsLetterOrDigit(str, 8).ToString()) + "\n";
}
}
// The example displays 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.