利用TcpClient HTTP协议获得网页源码

         private   string  GetHTMLTCP( string  URL)
        {
             string  strHTML  =   "" ; // 用来保存获得的HTML代码
            TcpClient clientSocket  =   new  TcpClient();
            Uri URI  =   new  Uri(URL);
            clientSocket.Connect(URI.Host, URI.Port);
            StringBuilder RequestHeaders  =   new  StringBuilder(); // 用来保存HTML协议头部信息
            RequestHeaders.AppendFormat( " {0} {1} HTTP/1.1\r\n " , " GET " /* 此处可填写GET或POST */ ,URI.PathAndQuery);
            RequestHeaders.AppendFormat( " Connection:close\r\n " );
            RequestHeaders.AppendFormat( " Host:{0}\r\n " , URI.Host);
            RequestHeaders.AppendFormat( " Accept:*/*\r\n " );
            RequestHeaders.AppendFormat( " Accept-Language:zh-cn\r\n " );
            RequestHeaders.AppendFormat( " User-Agent:Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)\r\n\r\n " );
            Encoding encoding  =  Encoding.Default;
             byte [] request  =  encoding.GetBytes(RequestHeaders.ToString());
            clientSocket.Client.Send(request);
             // 获取要保存的网络流
            Stream readStream  =  clientSocket.GetStream();
            StreamReader sr  =   new  StreamReader(readStream, Encoding.Default);
            strHTML  =  sr.ReadToEnd();


            readStream.Close();
            clientSocket.Close();
            
             return  strHTML;
        }

以上代码在VS2008环境下测试通过