Indicates whether a Unicode character is categorized as a number.

Overload List

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

Supported by the .NET Compact Framework.

[Visual Basic] Overloads Public Shared Function IsNumber(Char) As Boolean

[C#] public static bool IsNumber(char);

[C++] public: static bool IsNumber(__wchar_t);

[JScript] public static function IsNumber(Char) : Boolean;

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

Supported by the .NET Compact Framework.

[Visual Basic] Overloads Public Shared Function IsNumber(String, Integer) As Boolean

[C#] public static bool IsNumber(string, int);

[C++] public: static bool IsNumber(String*, int);

[JScript] public static function IsNumber(String, int) : Boolean;

Example

[Visual Basic, C#, C++] The following sample demonstrates IsNumber.

[Visual Basic, C#, C++] Note   This example shows how to use one of the overloaded versions of IsNumber. For other examples that might be available, see the individual overload topics.

[Visual Basic] 
Imports System

Module IsNumberSample

    Sub Main()

        Dim str As String
        str = "non-numeric"

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

    End Sub

End Module

[C#] 
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"
    }
}

[C++] 
#using <mscorlib.dll>
using namespace System;

int main() {
   String* str = "non-numeric";

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

[JScript] No example is available for JScript. To view a Visual Basic, C#, or C++ example, click the Language Filter button in the upper-left corner of the page.

See Also

Char Structure | Char Members | System Namespace