//Get请求方式     private string RequestGet(string Url)     {         string PageStr = string.Empty;//用于存放还回的html         Uri url = new Uri(Url);//Uri类 提供统一资源标识符 (URI) 的对象表示形式和对 URI 各部分的轻松访问。就是处理url地址         try         {             HttpWebRequest httprequest = (HttpWebRequest)WebRequest.Create(url);//根据url地址创建HTTpWebRequest对象             #region 参数设置             httprequest.Method = "get";             //---------------------------------------------设定一些参数（不必要可以）             //httprequest.KeepAlive = false;//持久连接设置为false             //httprequest.ProtocolVersion = HttpVersion.Version11;// 网络协议的版本             //httprequest.Proxy = WebProxy.GetDefaultProxy();//服务器代理             //httprequest.ContentType = "application/x-www-form-urlencoded";//http 头             //httprequest.AllowAutoRedirect = true;             //httprequest.MaximumAutomaticRedirections = 10;             //httprequest.Timeout = 30000;//设定超时十秒（毫秒）             //httprequest.UserAgent = "mozilla/4.0 (compatible; msie 6.0; windows nt 5.1)"; //浏览器             //=================================================             #endregion             HttpWebResponse response = (HttpWebResponse)httprequest.GetResponse();//使用HttpWebResponse获取请求的还回值             Stream steam = response.GetResponseStream();//从还回对象中获取数据流             StreamReader reader = new StreamReader(steam, Encoding.GetEncoding("gb2312"));//读取数据Encoding.GetEncoding("gb2312")指编码是gb2312，不让中文会乱码的             PageStr = reader.ReadToEnd();             reader.Close();         }         catch (Exception e)         {             PageStr += e.Message;         }         return PageStr;     }

//Post请求方式，于Get的方式写法相似，所以解释就些少一点了     private string RequestPost(string Url,string Context)//两个参数分别是Url地址和Post过去的数据     {         string PageStr=string.Empty;         Uri url = new Uri(Url);         byte[] reqbytes=Encoding.ASCII.GetBytes(Context);         try         {             HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);             req.Method = "post";             req.ContentType = "application/x-www-form-urlencoded";             req.ContentLength = reqbytes.Length;             Stream stm = req.GetRequestStream();             stm.Write(reqbytes, 0, reqbytes.Length);             stm.Close();             HttpWebResponse wr = (HttpWebResponse)req.GetResponse();             Stream stream = wr.GetResponseStream();             StreamReader srd= new StreamReader(stream,Encoding.GetEncoding("gb2312"));             PageStr += srd.ReadToEnd();             stream.Close();             srd.Close();         }         catch (Exception e)         {             PageStr += e.Message;         }         return PageStr;     }

public string WebClientGet(string url)         {             var client = new WebClient();             client.Headers.Add("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.0.3705;)");             var stream = client.OpenRead(url);             if (stream == null) return "";             var reader = new StreamReader(stream, Encoding.Default);             var result = reader.ReadToEnd();             stream.Close();             reader.Close();             return result;         }