多線程會有一個工作線程，占用更多的CPU。

異步將使用DMA模式的IO操作

using System; using System.Collections.Generic; using System.IO; using System.Linq; using System.Net; using System.Text; using System.Threading; using System.Threading.Tasks;namespace ConsoleApplication1 {class Program{static void Main(string[] args){var p = new Program();var url = "http://bj.58.com/";p.Asynchronous(url);p.MultiThread(url);Console.ReadKey();}void Asynchronous(string url){var request = HttpWebRequest.Create(url);request.BeginGetResponse((IAsyncResult ar) => {var request_inner = ar.AsyncState as WebRequest;var response = request.EndGetResponse(ar);read(response, "Asynchronous");}, request);}void MultiThread(string url){var t = new Thread(() =>{var request = HttpWebRequest.Create(url);var response = request.GetResponse();read(response, "MultiThread");});t.Start();}private static void read(WebResponse response, string funcname){var stream = response.GetResponseStream();using (var reader = new StreamReader(stream)){Console.WriteLine("{0} {1}", funcname, reader.ReadToEnd().Length);}}} }

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