BeginInvoke()使用

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Runtime.Serialization.Formatters.Binary;
using System.Xml;
using System.Threading;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Client application is starting!");
            Thread.CurrentThread.Name = "Main Thread";
            Cal cal = new Cal();
            AddDelegate del = new AddDelegate(cal.Add);

            // 需要保存 IAsyncResult 对象以便后边条用EndInvoke方法时作参数传递
            IAsyncResult asyncResult = del.BeginInvoke(, , null, null);

            // 做某些其它的事情，模拟需要执行 3 秒钟
            for (int i = ; i <= ; i++)
            {
                Thread.Sleep(TimeSpan.FromSeconds(i));
                Console.WriteLine("{0}: Client executed {1} second(s).", Thread.CurrentThread.Name, i);
            }

            // 传递 IAsyncResult 对象
            int rtnVal = del.EndInvoke(asyncResult);
            Console.WriteLine("Result: {0}\n", rtnVal);

            Console.WriteLine("\nPress any key to exit...");
            Console.ReadLine();

        }

        public delegate int AddDelegate(int a, int b);

        public class Cal
        {
            public int Add(int a, int b)
            {
                if (Thread.CurrentThread.IsThreadPoolThread)
                {
                    Thread.CurrentThread.Name = "Pool Thread";
                }
                Console.WriteLine("Method invoked!");

                // 做某些其它的事情，模拟需要执行 2 秒钟
                for (int i = ; i < ; i++)
                {
                    Thread.Sleep(TimeSpan.FromSeconds());
                    Console.WriteLine("{0}: Add executed {1} second(s).", Thread.CurrentThread.Name, i);
                }
                Console.WriteLine("Method complete!");
                return a + b;
            }
        }
    }
}