C#属性和方法

#define DEBUG
using System;
using System.Diagnostics;

public class Demo {
   [Conditional(DEBUG)]

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

class Test {
   static void functiondisplay() {
      Demo.Message(Our function...);
   }
   public static void Main() {
      Demo.Message(This is Main function!);
      functiondisplay();
      Console.ReadKey();
   }
}