C#条件指令

#define DEBUG
#define VC_V10
using System;

public class TestClass {

   public static void Main() {
      #if (DEBUG && !VC_V10)
         Console.WriteLine(DEBUG is defined);
      #elif (!DEBUG && VC_V10)
         Console.WriteLine(VC_V10 is defined);
      #elif (DEBUG && VC_V10)
         Console.WriteLine(DEBUG and VC_V10 are defined);
      #else
         Console.WriteLine(DEBUG and VC_V10 are not defined);
      #endif
      Console.ReadKey();
   }
}