Char.IsLetterOrDigit Method (String, Int32)

 

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

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

public static bool IsLetterOrDigit(
	string s,
	int index
)

Parameters

s
Type: System.String

A string.

index
Type: System.Int32

The position of the character to evaluate in s.

Return Value

Type: System.Boolean

true if the character at position index in s is a letter or a decimal digit; otherwise, false.

Exception Condition
ArgumentNullException

s is null.

ArgumentOutOfRangeException

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

Character positions in a string are indexed starting from zero.

Valid letters and decimal digits are members of the following categories in UnicodeCategory: UppercaseLetter, LowercaseLetter, TitlecaseLetter, ModifierLetter, OtherLetter, or DecimalDigitNumber.

The following code example demonstrates IsLetterOrDigit.

using System;

public class IsLetterOrDigitSample {
	public static void Main() {
		string str = "newline:\n";

		Console.WriteLine(Char.IsLetterOrDigit('8'));		// Output: "True"
		Console.WriteLine(Char.IsLetterOrDigit(str, 8));	// Output: "False", because it's a newline
	}
}

Universal Windows Platform
Available since 8
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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