同步、异步、异步回调

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Runtime.Remoting.Messaging;

namespace Async
{
    public delegate int AddHandler(int a, int b);

    public class AddCls
    {
        public static int Add(int a, int b)
        {
            Console.WriteLine("开始计算：" + a + "+" + b);
            Thread.Sleep(3000);
            Console.WriteLine("计算完成！");
            return a + b;
        }
    }

    public class Test
    {
        static void Main(string[] args)
        {
            //同步
            //sync();

            //异步
            //async();

            //异步回调
            asyncCallBack();

        }

        /// <summary>
        /// 同步
        /// </summary>
        private static void sync()
        {
            Console.WriteLine("===== 同步调用 SyncInvokeTest =====");
            AddHandler handler = new AddHandler(AddCls.Add);
            int result = handler.Invoke(1, 2);
            Console.WriteLine("继续做别的事情。。。");
            Console.WriteLine("和等于：" + result);
            Console.ReadKey();
        }

        /// <summary>
        /// 异步
        /// </summary>
        private static void async()
        {
            Console.WriteLine("===== 异步调用 AsyncInvokeTest =====");
            AddHandler handler = new AddHandler(AddCls.Add);
            IAsyncResult ir = handler.BeginInvoke(1, 2, null, null);
            Console.WriteLine("继续做别的事情。。。");
            int result = handler.EndInvoke(ir);
            Console.WriteLine("和等于：" + result);
            Console.ReadKey();
        }

        /// <summary>
        /// 异步回调
        /// </summary>
        private static void asyncCallBack()
        {
            Console.WriteLine("===== 异步调用 AsyncInvokeTest =====");
            AddHandler handler = new AddHandler(AddCls.Add);
            IAsyncResult ir = handler.BeginInvoke(1, 2, new AsyncCallback(callBack), "AsycState:OK");
            Console.WriteLine("继续做别的事情。。。");
            Console.ReadKey();
        }

        /// <summary>
        /// 回调
        /// </summary>
        private static void callBack(IAsyncResult ir)
        {
            AddHandler handler = (AddHandler)((AsyncResult)ir).AsyncDelegate;
            Console.WriteLine(handler.EndInvoke(ir));
            Console.WriteLine(ir.AsyncState);
        }
    }
}