This documentation is archived and is not being maintained.

# Uri.FromHex Method

Visual Studio 2008

Gets the decimal value of a hexadecimal digit.

Namespace:  System
Assembly:  System (in System.dll)

## Syntax

```public static int FromHex(
char digit
)
```

#### Parameters

digit
Type: System.Char

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

#### Return Value

Type: System.Int32
An Int32 value that contains a number from 0 to 15 that corresponds to the specified hexadecimal digit.

## Exceptions

ExceptionCondition
ArgumentException

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

## 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.

## 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 hexadecimal 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(S"'{0}' is the hexadecimal representation of {1}", __box(testChar), __box(Uri::FromHex(testChar)));
else
Console::WriteLine(S"'{0}' is not a hex character", __box(testChar));

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

## Platforms

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

## Version Information

#### .NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

#### .NET Compact Framework

Supported in: 3.5, 2.0, 1.0

#### XNA Framework

Supported in: 3.0, 2.0, 1.0