Preprosessor directives

Preprosessor directives mark the code block for compiler.

For example,

#define DEBUG
using System;
class MyClass
{
    int x;
    void aMethod()
    {
# if DEBUG
        Console.WriteLine("Testing: x = {0}", x);
# endif
    }

}

If DEBUG is defined C# will compile the statement.

We can supply the flag with /define:Symbol through commandline.

The following table lists all C# Preprosessor directives