# Uri.FromHex(Char) Method

## Definition

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

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

#### Exceptions

`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 ) == true )
{
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) == true)
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.