IsLetterOrDigit Method (String, Int32)
Collapse the table of content
Expand the table of content

Char.IsLetterOrDigit Method (String, Int32)

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

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.

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

The following example demonstrates IsLetterOrDigit.


using System;

public class Example
{
   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
   {
      string str = "newline:\n";

      outputBlock.Text += Char.IsLetterOrDigit('8').ToString() + "\n";	
      outputBlock.Text += (Char.IsLetterOrDigit(str, 8).ToString()) + "\n";
   }
}
// The example displays the following output:
//    True
//    False


Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

Show:
© 2016 Microsoft