C #else

In C#, the #else directive is used in conjunction with the #if directive to define an alternative block of code that should be compiled if the condition specified in the #if directive evaluates to false. It is part of the conditional compilation feature in C#.

Here’s an example to illustrate its usage:

#define DEBUG

using System;

class Program
{
    static void Main()
    {
        #if DEBUG
            Console.WriteLine("Debug mode is enabled.");
        #else
            Console.WriteLine("Debug mode is disabled.");
        #endif

        // Rest of the code...
    }
}

In the above code, the #if DEBUG directive checks if the symbol DEBUG is defined. If it is defined, the code inside the #if block is compiled. Otherwise, the code inside the #else block is compiled.

In this case, assuming the DEBUG symbol is defined, the output would be: “Debug mode is enabled.” If the DEBUG symbol is not defined, the output would be: “Debug mode is disabled.”

The #else directive provides a way to handle different compilation scenarios based on the defined symbols, allowing you to have alternative code paths depending on certain conditions during compilation.