Uri.FromHex(Char) Method

Definition

Namespace:

System

Assembly:

System.Runtime.dll

Source:

Uri.cs

Gets the decimal value of a hexadecimal digit.

public:
 static int FromHex(char digit);

public static int FromHex (char digit);

static member FromHex : char -> int

Public Shared Function FromHex (digit As Char) As Integer

Parameters

digit

Char

The hexadecimal digit (0-9, a-f, A-F) to convert.

Returns

Int32

A number from 0 to 15 that corresponds to the specified hexadecimal digit.

Exceptions

ArgumentException

digit is not a valid hexadecimal digit (0-9, a-f, A-F).

Examples

The following example determines whether a character is a hexadecimal character and, if it is, writes the corresponding decimal value to the console.

char testChar = 'e';
if ( Uri::IsHexDigit( testChar ) )
{
   Console::WriteLine( "'{0}' is the hexadecimal representation of {1}",
      testChar, Uri::FromHex( testChar ) );
}
else
{
   Console::WriteLine( "'{0}' is not a hex character", testChar );
}

String^ returnString = Uri::HexEscape( testChar );
Console::WriteLine( "The hexadecimal value of '{0}' is {1}", testChar, returnString );

char  testChar = 'e';
if (Uri.IsHexDigit(testChar))
    Console.WriteLine("'{0}' is the hexadecimal representation of {1}", testChar, Uri.FromHex(testChar));
else
    Console.WriteLine("'{0}' is not a hexadecimal character", testChar);

string returnString = Uri.HexEscape(testChar);
Console.WriteLine("The hexadecimal value of '{0}' is {1}", testChar, returnString);

let testChar = 'e'
if Uri.IsHexDigit testChar then
    printfn $"'{testChar}' is the hexadecimal representation of {Uri.FromHex testChar}"
else
    printfn $"'{testChar}' is not a hexadecimal character"

let returnString = Uri.HexEscape testChar
printfn $"The hexadecimal value of '{testChar}' is {returnString}"

Dim testChar As Char = "e"c
If Uri.IsHexDigit(testChar) = True Then
    Console.WriteLine("'{0}' is the hexadecimal representation of {1}", testChar, Uri.FromHex(testChar))
Else
    Console.WriteLine("'{0}' is not a hexadecimal character", testChar)
End If 
Dim returnString As String = Uri.HexEscape(testChar)
Console.WriteLine("The hexadecimal value of '{0}' is {1}", testChar, returnString)

Remarks

The FromHex method converts a character representing a hexadecimal digit (0-9, a-f, A-F) to its decimal value (0 to 15). If digit is not a valid hexadecimal digit, an ArgumentException exception is thrown.