Char.IsLetterOrDigit Method

Definition

Indicates whether a Unicode character is categorized as a letter or a decimal digit.

Overloads

IsLetterOrDigit(String, Int32)

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

IsLetterOrDigit(Char)

Indicates whether the specified Unicode character is categorized as a letter or a decimal digit.

Examples

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
    }
}

Remarks

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

IsLetterOrDigit(String, Int32)

Source:
Char.cs
Source:
Char.cs
Source:
Char.cs

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

public static bool IsLetterOrDigit (string s, int index);

Parameters

s
String

A string.

index
Int32

The position of the character to evaluate in s.

Returns

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

Exceptions

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

Remarks

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.

See also

Applies to

.NET 9 ve diğer sürümler
Ürün Sürümler
.NET Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9
.NET Framework 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 2.0, 2.1
UWP 10.0

IsLetterOrDigit(Char)

Source:
Char.cs
Source:
Char.cs
Source:
Char.cs

Indicates whether the specified Unicode character is categorized as a letter or a decimal digit.

public static bool IsLetterOrDigit (char c);

Parameters

c
Char

The Unicode character to evaluate.

Returns

true if c is a letter or a decimal digit; otherwise, false.

Remarks

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

See also

Applies to

.NET 9 ve diğer sürümler
Ürün Sürümler
.NET Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9
.NET Framework 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 2.0, 2.1
UWP 10.0