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();
   }
}