简单的异步

using System;
using System.Threading;
namespace ConsoleApplication1
{
    class Class1
    {
        //声明委托
        public delegate void AsyncEventHandler();

        //异步方法
        void Event1()
        {
            Console.WriteLine("Event1 Start");
            System.Threading.Thread.Sleep(4000);
            Console.WriteLine("Event1 End");
        }
        // 同步方法
        void Event2()
        {
            Console.WriteLine("Event2 Start");
            int i = 1;
            while (i < 10)
            {
                i = i + 1;
                Console.WriteLine("Event2 " + i.ToString());
            }
            Console.WriteLine("Event2 End");
        }
        void Event3()
        {
            Console.WriteLine("Event3 Start");
            for (int i = 0; i < 100; i++)
            {
                Thread.Sleep(5);
                Console.WriteLine(i.ToString());
            }
            Console.WriteLine("Event3 End.");
        }

        [STAThread]
        static void Main(string[] args)
        {
            long start = 0;
            long end = 0;
            Class1 c = new Class1();
            Console.WriteLine("ready");
            start = DateTime.Now.Ticks;
            //实例委托
            AsyncEventHandler asy = new AsyncEventHandler(c.Event1);
            //异步调用开始，没有回调函数和AsyncState,都为null
            IAsyncResult ia = asy.BeginInvoke(null, null);
            //同步开始，
            c.Event2();
            //异步结束，若没有结束，一直阻塞到调用完成，在此返回该函数的return，若有返回值。

            asy.EndInvoke(ia);
            //都同步的情况。
            //c.Event1();
            //c.Event2();

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