깊이 분석 C\#비동기 프로 그래 밍 상세 설명

using System;
 namespace ConsoleApplication1
 {
     class Class1
     {
         //    
         public delegate void AsyncEventHandler();

         //    
         void Event1()
        {
            Console.WriteLine("Event1 Start");
            System.Threading.Thread.Sleep(4000);
            Console.WriteLine("Event1 End");
        }
        //     
        void Event2()
        {
            Console.WriteLine("Event2 Start");
            int i=1;
            while(i<1000)
            {
                i=i+1;
                Console.WriteLine("Event2 "+i.ToString());
            }
            Console.WriteLine("Event2 End");
        }
        [STAThread]
        static void Main(string[] args)
        {
            long start=0;
            long end=0;
            Class1 c = new Class1();
            Console.WriteLine("ready");
            start=DateTime.Now.Ticks;
            //    
            AsyncEventHandler asy = new AsyncEventHandler(c.Event1);
            //      ，       AsyncState,  null
            IAsyncResult ia = asy.BeginInvoke(null, null);
            //    ，
            c.Event2();
            //    ，     ，         ，        return，     。

            asy.EndInvoke(ia);
            //      。
            //c.Event1();
            //c.Event2();

            end =DateTime.Now.Ticks;
            Console.WriteLine("     ="+ Convert.ToString(end-start) );
            Console.ReadLine();
        }
    }
}