You can use more complex expressions in #if and #elif directives, instead of just checking to see whether a single conditional compilation symbol is defined.
In the example below, the #elif directive triggers if the DOGSBARK symbol is defined and then DOGSGROWL symbol is not defined.
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| #define DOGSBARK //#define DOGSWAG //#define DOGSGROWL using System; using DogLibrary; namespace ConsoleApplication1 { class Program { static void Main() { Dog d = new Dog( "Kirby" , 12); #if DOGSWAG d.WagTail(); #elif DOGSBARK && !DOGSGROWL d.Bark(); #else d.BarkAndGrowl(); #endif } } } |
You can build more complex expressions using parentheses and the && (logical AND) and || (logical OR) operators.
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| #if (DOGSWAG && DOGSDOTRICKS) || (DOGSDOEVERYTHING) d.WagAndFetch(); #endif |