c#之简单的 Web 服务器 C#

我需要一些关于这段代码的帮助:

using System; 
using System.Collections.Generic; 
using System.Net; 
using System.Net.Sockets; 
using System.IO; 
namespace HttpEcho 
{ 
  class HttpEchoProgram 
  { 
    static void Main(string[] args) 
    { 
      TcpListener server = new TcpListener(IPAddress.Parse("127.0.0.1"), 80); 
      server.Start(); 
      Console.WriteLine("Waiting for Client..."); 
      TcpClient newConn = server.AcceptTcpClient(); 
      IPEndPoint iep = (IPEndPoint)(newConn.Client.RemoteEndPoint); 
      IPAddress add = iep.Address; 
      int prt = iep.Port; 
      Console.WriteLine("Connected with a client: {0}: {1} ", add, prt); 
      NetworkStream stream = newConn.GetStream(); 
      StreamReader sr = new StreamReader(stream); 
      StreamWriter sw = new StreamWriter(stream); 
      sw.WriteLine("HTTP/1.1 200 OK"); 
      sw.WriteLine("Content-Type: text/plain"); 
      //sw.WriteLine("Content-Length: size"); 
      sw.WriteLine(); 
      String line = null; 
      while ((line = sr.ReadLine()).Length != 0) 
      { 
        Console.WriteLine(line); 
        sw.WriteLine(line); 
        sw.Flush(); 
      } 
      newConn.Close(); 
      server.Stop(); 
    } 
  } 
} 

我想修改这段代码，以便它可以作为一个简单的 Web 服务器工作，它可以在本地文件系统中获取请求的页面并将其返回给浏览器。

请您参考如下方法:

从 HttpListener 开始，您可以节省几千行代码。 http://msdn.microsoft.com/en-us/library/system.net.httplistener.aspx