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Char::IsDigit Method (String^, Int32)

.NET Framework (current version)
 

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)

C#
C++
F#
VB
Copy 
public:
static bool IsDigit(
	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 decimal digit; otherwise, false.

Exception Condition
ArgumentNullException

s is null.

ArgumentOutOfRangeException

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

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.

The following code example demonstrates IsDigit.

C#
C++
VB
Copy 
using namespace System;
int main()
{
   char ch = '8';
   Console::WriteLine( Char::IsDigit( ch ) ); // Output: "True"
   Console::WriteLine( Char::IsDigit(  "sample string", 7 ) ); // Output: "False"
}

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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