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Char.IsDigit Method (String, Int32)

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

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

public static bool IsDigit(
	string s,
	int index
)

Parameters

s
Type: System.String
A String.
index
Type: System.Int32
The character position in s.

Return Value

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

ExceptionCondition
ArgumentNullException

s is null.

ArgumentOutOfRangeException

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

This method determines if a Char is a radix-10 digit. This contrasts with IsNumber, 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.

Character positions in a string are indexed starting from zero.

Valid digits are members of the UnicodeCategory.DecimalDigitNumber category.

The following example demonstrates IsDigit.


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"
   }
}


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

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

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