IT. Expert System.

C#

explicit


The explicit keyword declares a user-defined type conversion operator that must be invoked with a cast. For example, this operator converts from a class called Fahrenheit to a class called Celsius:

Syntax:
public static explicit operator Celsius(Fahrenheit fahr)
{
    return new Celsius((5.0f / 9.0f) * (fahr.degrees - 32));
}


Example:

struct Digit
{
    byte value;
    public Digit(byte value)
    {
        if (value > 9)
        {
            throw new ArgumentException();
        }
        this.value = value;
    }

    // Define explicit byte-to-Digit conversion operator: 
    public static explicit operator Digit(byte b)
    {
        Digit d = new Digit(b);
        Console.WriteLine("conversion occurred");
        return d;
    }
}

class ExplicitTest
{
    static void Main()
    {
        try
        {
            byte b = 3;
            Digit d = (Digit)b; // explicit conversion
        }
        catch (Exception e)
        {
            Console.WriteLine("{0} Exception caught.", e);
        }
    }
}
/*
Output:
conversion occurred
*/


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