C#属性条件

#define DEBUG
using System;
using System.Diagnostics;

public class Myclass {
   [Conditional("DEBUG")]

   public static void Message(string msg) {
      Console.WriteLine(msg);
   }
}

class Test {
   static void function1() {
      Myclass.Message("In Function 1.");
      function2();
   }

   static void function2() {
      Myclass.Message("In Function 2.");
   }

   public static void Main() {
      Myclass.Message("In Main function.");
      function1();
      Console.ReadKey();
   }
}