C# | Uri.FromHex() Method

Uri.FromHex(Char) Method is used to get the decimal value of a hexadecimal digit.

Syntax: public static int FromHex (char digit);
Here, it takes the hexadecimal digit (0-9, a-f, A-F) to convert.

Return Value: This method returns an Int32 value that contains a number from 0 to 15 that corresponds to the specified hexadecimal digit.

Exception: This method throws ArgumentException if the digit is not a valid hexadecimal digit (0-9, a-f, A-F).

Below programs illustrate the use of Uri.FromHex(Char) Method:

Example 1:

// C# program to demonstrate the
// Uri.FromHex(Char) Method
using System;
using System.Globalization;

class GFG {

    // Main Method
    public static void Main()
    {
        // Declaring and initializing Char value
        char value = 'A';

        // Gets the decimal value
        // of a hexadecimal digit.
        // using FromHex() method
        int dec = Uri.FromHex(value);

        // Displaying the result
        Console.WriteLine("Converted int value : {0}", dec);
    }
}

Output:

Converted int value : 10

Example 2: For ArgumentException

// C# program to demonstrate the
// Uri.FromHex(Char) Method
using System;
using System.Globalization;

class GFG {

    // Main Method
    public static void Main()
    {
        try {

            // Declaring and initializing
            // Char value
            char value = '.';

            // Gets the decimal value
            // of a hexadecimal digit.
            // using FromHex() method
            int dec = Uri.FromHex(value);

            // Displaying the result
            Console.WriteLine("Converted int value : {0}", dec);
        }

        catch (ArgumentException e)
        {
            Console.WriteLine("Digit should be a valid "+
                   "Hexadecimal digit (0-9, a-f, A-F).");
            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
    }
}

Output:

Digit should be a valid Hexadecimal digit (0-9, a-f, A-F).
Exception Thrown: System.ArgumentException

Reference:

• https://docs.microsoft.com/en-us/dotnet/api/system.uri.fromhex?view=netstandard-2.1