preprocessir directives

Posted on 2006-11-09
Medium Priority
Last Modified: 2008-02-07
Does C# have anything like in C -

#ifndef BLAH

#define BLAH

in C# I've tried #if (!BLAH)  #if (BLAH == false), both of which do not compile.

Naturally I can just say  #if BLAH  #else ..........  #endif, but I was wondering if C# supported the other.  Thanks
Question by:ARACK04
  • 2
LVL 15

Accepted Solution

ozymandias earned 2000 total points
ID: 17906935
#if symbol [operator symbol]...

The name of the symbol you want to test. You can also use true and false. symbol can be prefaced with the negation operator. For example, !true will evaluate to false.
operator (optional)
You can use the following operators to evaluate multiple symbols:
== (equality)

!= (inequality)

&& (and)

|| (or)

You can group symbols and operators with parentheses.

// preprocessor_if.cs
#define DEBUG
#define VC_V7
using System;
public class MyClass
   public static void Main()

      #if (DEBUG && !VC_V7)
         Console.WriteLine("DEBUG is defined");
      #elif (!DEBUG && VC_V7)
         Console.WriteLine("VC_V7 is defined");
      #elif (DEBUG && VC_V7)
         Console.WriteLine("DEBUG and VC_V7 are defined");
         Console.WriteLine("DEBUG and VC_V7 are not defined");
LVL 15

Expert Comment

ID: 17906947
The above from MSDN C# Programmers Reference...

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