异步

using System;
//using System.Collections.Generic;
//using System.Linq;
//using System.Text;
using System.Threading;
using System.Net;

namespace AsyBeginEndNoEncapsulationSimply
{
    class Program
    {
        static void Main(string[] args)
        {
            ShowUriContent("http://www.cnblogs.com/DebugLZQ");//原同步方法
            ShowUriContentAsync("http://www.cnblogs.com/DebugLZQ");  //进行异步封装
            ShowUriContentAsync1("http://www.cnblogs.com/DebugLZQ");//简化1：Action简化
            ShowUriContentAsync2("http://www.cnblogs.com/DebugLZQ");//简化2：匿名方法简化
            ShowUriContentAsync3("http://www.cnblogs.com/DebugLZQ");//简化3：Lambda简化
            

            Thread.Sleep(50000);
        }
        //------进行异步封装
        public delegate void ShowUriContentDelegate(string text);
        static void ShowUriContentAsync(string uri)
        {
            ShowUriContentDelegate showUriContentDelegate = ShowUriContent;
            showUriContentDelegate.BeginInvoke(uri, ShowUriContentCompleted, showUriContentDelegate);
        }

        static void ShowUriContentCompleted(IAsyncResult result)
        {
            (result.AsyncState as ShowUriContentDelegate).EndInvoke(result);
        }
        //------进行异步封装--简化1：Action简化
        static void ShowUriContentAsync1(string uri)
        {
            Action<string> showUriContentDelegate = ShowUriContent;
            showUriContentDelegate.BeginInvoke(uri, ShowUriContentCompleted1, showUriContentDelegate);
        }

        static void ShowUriContentCompleted1(IAsyncResult result)
        {
            (result.AsyncState as Action<string>).EndInvoke(result);
        }
        //------简化2：匿名方法简化
        static void ShowUriContentAsync2(string uri)
        {
            Action<string> showUriContentDelegate = delegate(string uri_)
            {
                using (WebClient client = new WebClient())
                {
                    string text = client.DownloadString(uri_);
                    Display(text);
                }
            };
            showUriContentDelegate.BeginInvoke(uri, delegate(IAsyncResult result) { (result.AsyncState as Action<string>).EndInvoke(result); }, showUriContentDelegate);
        }
        //------简化3：Lambda简化
        static void ShowUriContentAsync3(string uri)
        {
            Action<string> showUriContentDelegate = ( uri_)=>
            {
                using (WebClient client = new WebClient())
                {
                    string text = client.DownloadString(uri_);
                    Display(text);
                }
            };
            showUriContentDelegate.BeginInvoke(uri, (result) => { (result.AsyncState as Action<string>).EndInvoke(result); }, showUriContentDelegate);
        }       
       
        //---------------------原同步方法
        static void ShowUriContent(string uri)
        {
            using (WebClient client = new WebClient())
            {
                string text = client.DownloadString(uri);
                Display(text);
            }
        }

        static void Display(string text)
        {
            Console.WriteLine(text.Length);
        }
    }
}