Char.IsDigit Method
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Indicates whether a Unicode character is categorized as a decimal digit.
IsDigit(Char) |
Indicates whether the specified Unicode character is categorized as a decimal digit. |
IsDigit(String, Int32) |
Indicates whether the character at the specified position in a specified string is categorized as a decimal digit. |
The following code example demonstrates IsDigit.
using namespace System;
int main()
{
char ch = '8';
Console::WriteLine( Char::IsDigit( ch ) ); // Output: "True"
Console::WriteLine( Char::IsDigit( "sample string", 7 ) ); // Output: "False"
}
using System;
public class IsDigitSample {
public static void Main() {
char ch = '8';
Console.WriteLine(Char.IsDigit(ch)); // Output: "True"
Console.WriteLine(Char.IsDigit("sample string", 7)); // Output: "False"
}
}
open System
let ch = '8'
printfn $"{Char.IsDigit ch}" // Output: "True"
printfn $"""{Char.IsDigit("sample string", 7)}""" // Output: "False"
Module IsDigitSample
Sub Main()
Dim ch8 As Char
ch8 = "8"c
Console.WriteLine(Char.IsDigit(ch8)) ' Output: "True"
Console.WriteLine(Char.IsDigit("sample string", 6)) ' Output: "False"
End Sub
End Module
Valid digits are members of the UnicodeCategory.DecimalDigitNumber category.
- Source:
- Char.cs
- Source:
- Char.cs
- Source:
- Char.cs
Indicates whether the specified Unicode character is categorized as a decimal digit.
public:
static bool IsDigit(char c);
public static bool IsDigit (char c);
static member IsDigit : char -> bool
Public Shared Function IsDigit (c As Char) As Boolean
Parameters
- c
- Char
The Unicode character to evaluate.
Returns
true
if c
is a decimal digit; otherwise, false
.
Remarks
This method determines whether a Char is a radix-10 digit. This contrasts with IsNumber, which determines whether 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.
Valid digits are members of the UnicodeCategory.DecimalDigitNumber category.
See also
Applies to
.NET 9 et autres versions
Produit | Versions |
---|---|
.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 |
- 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 decimal digit.
public:
static bool IsDigit(System::String ^ s, int index);
public static bool IsDigit (string s, int index);
static member IsDigit : string * int -> bool
Public Shared Function IsDigit (s As String, index As Integer) As Boolean
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 decimal digit; otherwise, false
.
Exceptions
s
is null
.
index
is less than zero or greater than the last position in s
.
Remarks
This method determines whether a Char is a radix-10 digit. This contrasts with IsNumber, which determines whether 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.
See also
Applies to
.NET 9 et autres versions
Produit | Versions |
---|---|
.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 |
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