理解析构函数的执行过程

class First
    {
        public First()
        {
            System.Console.WriteLine("First class start!");
        }
        ~First()
        {
            System.Console.WriteLine("First's destructor is called");
            System.Console.ReadLine();
        }
    }

    class Second : First
    {
        public Second()
        {
            System.Console.WriteLine("Second class start!");
        }
        ~Second()
        {
            System.Console.WriteLine("Second's destructor is called");
        }
    }

    class Third : Second
    {
        public Third()
        {
            System.Console.WriteLine("Third class start!");
        }
        ~Third()
        {
            System.Console.WriteLine("Third's destructor is called");
        }
    }

    class TestDestructors
    {
        static void Main()
        {
            Third t = new Third();
        }
    }

First class start!

Second class start!

Third class start!

Third's destructor is called

Second's destructor is called

First's destructor is called

析构函数的执行过程实际是执行了Finalize方法，具体的方法实际是：

protected overrid Finalize()

{

　　try

　　　　{

　　　　　　//implemention

　　　　}

　　Finally

　　　　{

　　　　　　　base.Finalize();

　　　　}

}