using System;

using System.Runtime.Remoting.Messaging;

using System.Threading;

using System.Threading.Tasks;

namespace LCS.WeiXin.Transfer

{

    class Program

    {

        public delegate int AddHandler(int a, int b, int c);

        static void Main()

        {

            Func<int, int, int, int> fun = AddClass.Add;

            //  fun.BeginInvoke(1, 2, 3, CallbackFunc, null);

            Console.WriteLine("===== 异步回调 AsyncInvokeTest =====");

            AddHandler handler = new AddHandler(AddClass.Add);

            //异步操作接口(注意BeginInvoke方法的不同！)

            IAsyncResult result = handler.BeginInvoke(1, 2, 3, new AsyncCallback(CallbackFunc), "AsycState:OK");

            Console.WriteLine("------继续做别的事情。。。--------");

            Console.ReadKey();

        }

        public static void CallbackFunc(IAsyncResult result)

        {

            //result 是“加法类.Add()方法”的返回值

            //AsyncResult 是IAsyncResult接口的一个实现类，引用空间：System.Runtime.Remoting.Messaging

            //AsyncDelegate 属性可以强制转换为用户定义的委托的实际类。

            Func<int, int, int, int> fun = AddClass.Add;

            AddHandler handler = (AddHandler)((AsyncResult)result).AsyncDelegate;

            // fun.EndInvoke(result);

            Console.WriteLine(handler.EndInvoke(result));

            Console.WriteLine(result.AsyncState);

        }

        public class AddClass

        {

            public static int Add(int a, int b, int c)

            {

                Console.WriteLine("\n开始计算：" + a + "+" + b + "+" + c);

                Thread.Sleep(3000); //模拟该方法运行三秒

                Console.WriteLine("计算完成！");

                return a + b + c;

            }

        }

        static async void Async2()

        {

            await Task.Run(() => { Thread.Sleep(5000); Console.WriteLine("bbb"); });

            Console.WriteLine("ccc");

        }

        public static Task<int> ForTest()

        {

            return Task.Factory.StartNew<int>(() =>

            {

                Console.WriteLine("ddd");

                return 1;

            });

        }

    }

}