Char.IsDigit Method (Char)
Microsoft Silverlight will reach end of support after October 2021. Learn more.
Indicates whether the specified Unicode character is categorized as a decimal digit.
Namespace: System
Assembly: mscorlib (in mscorlib.dll)
Syntax
'Declaration
Public Shared Function IsDigit ( _
c As Char _
) As Boolean
public static bool IsDigit(
char c
)
Parameters
- c
Type: System.Char
A Unicode character.
Return Value
Type: System.Boolean
true if c is a decimal digit; otherwise, false.
Remarks
This method determines if a Char is a radix-10 digit. This contrasts with the IsNumber method, which determines if a Char is of any numeric Unicode category. Numbers include characters such as fractions, subscripts, superscripts, Roman numerals, currency numerators, encircled numbers, and script-specific digits.
Valid digits are members of the UnicodeCategory.DecimalDigitNumber category.
Examples
The following example demonstrates IsDigit.
Module Example
Public Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
Dim ch8 As Char
ch8 = "8"c
outputBlock.Text &= Char.IsDigit(ch8) & vbCrLf ' Output: "True"
outputBlock.Text += String.Format(Char.IsDigit("sample string", 6)) & vbCrLf ' Output: "False"
End Sub
End Module
using System;
public class Example
{
public static void Demo(System.Windows.Controls.TextBlock outputBlock)
{
char ch = '8';
outputBlock.Text += Char.IsDigit(ch) + "\n"; // Output: "True"
outputBlock.Text += Char.IsDigit("sample string", 7) + "\n"; // Output: "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.