using System;namespace ConsoleApplication{  public class Program  {    public static void Main(string[] args)    {      Console.WriteLine("Hello World!");      fun();      GC.Collect();                //4、若不顯式回收，則控制臺不打印回收行。      Console.WriteLine("end!");    }    public static void fun(){            //1、此處必須有static      A a=new A();      a.Dispose();      //GC.Collect();               //3、此處回收無效，因為a還沒釋放    }    public class A:IDisposable{     /* protected override void Finalize(){     //2、析構實際是重載Finalize，但不能直接寫重載。編譯器自動重寫Finalize，所以代碼中，只能用 析構函數。             Console.WriteLine("some one disposed!");      }*/       ~A(){         Console.WriteLine("some one Finalize!");      }      public void Dispose(){         Console.WriteLine("some one disposed!");      }    }  }}

Hello World!                                         some one disposed!                                       end!                                              some one Finalize!