IsNumber Method (Char)
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Char.IsNumber Method (Char)

Indicates whether the specified Unicode character is categorized as a number.

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

public static bool IsNumber (
	char c
)
public static boolean IsNumber (
	char c
)
public static function IsNumber (
	c : char
) : boolean
Not applicable.

Parameters

c

A Unicode character.

Return Value

true if c is a number; otherwise, false.

This method determines if a Char is of any numeric Unicode category. This contrasts with IsDigit, which determines if a Char is a radix-10 digit.

Valid numbers are members of the following categories in UnicodeCategory: DecimalDigitNumber, LetterNumber, or OtherNumber.

The following code example demonstrates IsNumber.

using System;

public class IsNumberSample {
	public static void Main() {
		string str = "non-numeric";

		Console.WriteLine(Char.IsNumber('8'));		// Output: "True"
		Console.WriteLine(Char.IsNumber(str, 3));	// Output: "False"
	}
}

import System.*;

public class IsNumberSample
{
    public static void main(String[] args)
    {
        String str = "non-numeric";
      
        Console.WriteLine(Char.IsNumber('8'));        // Output: "True"
        Console.WriteLine(Char.IsNumber(str, 3));    // Output: "False"
    } //main
} //IsNumberSample

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

XNA Framework

Supported in: 1.0

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