ahjesus HttpQuery

     /// <summary>
     /// 有关HTTP请求的辅助类
     /// </summary>
     public class HttpQuery
     {
         private static readonly string DefaultUserAgent =
             "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)";

         public static void Get(string url, object data, Action<string> callback)
         {
             IDictionary<string, string> parameters = Getparameters(data);

             if (!(parameters == null || parameters.Count == ))
             {
                 url += "?";
                 foreach (var item in parameters)
                 {
                     url += item.Key + "=" + item.Value + "&";
                 }
             }
             CreateGetHttpResponse(url, null, null, null, callback);
         }

         public static void Post(string url, object data, Action<string> callback)
         {
             IDictionary<string, string> parameters = Getparameters(data);

             CreatePostHttpResponse(url, parameters, null, null, Encoding.UTF8, null, callback);
         }

         public static void Post(string url, string data, Action<string> callback)
         {
             CreatePostHttpResponse(url, data, null, null, Encoding.UTF8, null, callback);
         }

         private static IDictionary<string, string> Getparameters(object data)
         {
             if (data == null)
             {
                 return new Dictionary<string, string>();
             }
             IDictionary<string, string> parameters = new Dictionary<string, string>();

             Type type = data.GetType();
             PropertyInfo[] props = type.GetProperties(BindingFlags.Public | BindingFlags.Instance);
             foreach (PropertyInfo p in props)
             {
                 parameters.Add(p.Name, p.GetValue(data).ToString());
             }

             return parameters;
         }

         /// <summary>
         /// 创建GET方式的HTTP请求
         /// </summary>
         /// <param name="url">请求的URL</param>
         /// <param name="timeout">请求的超时时间</param>
         /// <param name="userAgent">请求的客户端浏览器信息，可以为空</param>
         /// <param name="cookies">随同HTTP请求发送的Cookie信息，如果不需要身份验证可以为空</param>
         /// <returns></returns>
         private static HttpWebResponse CreateGetHttpResponse(string url, int? timeout, string userAgent,
             CookieCollection cookies, Action<string> callback, string encoding = "utf-8")
         {
             if (string.IsNullOrEmpty(url))
             {
                 return null;
                 //throw new ArgumentNullException("url");
             }
             try
             {
                 HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
                 request.Method = "GET";
                 request.UserAgent = DefaultUserAgent;
                 if (!string.IsNullOrEmpty(userAgent))
                 {
                     request.UserAgent = userAgent;
                 }
                 if (timeout.HasValue)
                 {
                     request.Timeout = timeout.Value;
                 }
                 if (cookies != null)
                 {
                     request.CookieContainer = new CookieContainer();
                     request.CookieContainer.Add(cookies);
                 }

                 HttpWebResponse httpWebResponse = request.GetResponse() as HttpWebResponse;

                 StreamReader reader = new StreamReader(httpWebResponse.GetResponseStream(),
                     System.Text.Encoding.GetEncoding(encoding));

                 string html = "";
                 //获取请求到的数据
                 html = reader.ReadToEnd();
                 //关闭
                 httpWebResponse.Close();
                 reader.Close();

                 Regex regex = new Regex("charset=(?<code>\\w+)\"");
                 Match match = regex.Match(html);
                 string code = match.Groups["code"].Value;
                 if (!string.IsNullOrWhiteSpace(code) && code.ToLower() != encoding.ToLower())
                 {
                     return CreateGetHttpResponse(url, timeout, userAgent, cookies, callback, code);
                 }
                 else
                 {
                     callback(html);
                     return httpWebResponse;
                 }
             }
             catch
             {
                 callback(null);
             }
             return null;
         }

         /// <summary>
         /// 创建POST方式的HTTP请求
         /// </summary>
         /// <param name="url">请求的URL</param>
         /// <param name="parameters">随同请求POST的参数名称及参数值字典</param>
         /// <param name="timeout">请求的超时时间</param>
         /// <param name="userAgent">请求的客户端浏览器信息，可以为空</param>
         /// <param name="requestEncoding">发送HTTP请求时所用的编码</param>
         /// <param name="cookies">随同HTTP请求发送的Cookie信息，如果不需要身份验证可以为空</param>
         /// <returns></returns>
         private static HttpWebResponse CreatePostHttpResponse(string url, IDictionary<string, string> parameters,
             int? timeout, string userAgent, Encoding requestEncoding, CookieCollection cookies, Action<string> callback)
         {
             if (string.IsNullOrEmpty(url))
             {
                 throw new ArgumentNullException("url");
             }
             if (requestEncoding == null)
             {
                 throw new ArgumentNullException("requestEncoding");
             }
             HttpWebRequest request = null;
             try
             {
                 //如果是发送HTTPS请求
                 if (url.StartsWith("https", StringComparison.OrdinalIgnoreCase))
                 {
                     ServicePointManager.ServerCertificateValidationCallback =
                         new RemoteCertificateValidationCallback(CheckValidationResult);
                     request = WebRequest.Create(url) as HttpWebRequest;
                     request.ProtocolVersion = HttpVersion.Version10;
                 }
                 else
                 {
                     request = WebRequest.Create(url) as HttpWebRequest;
                 }
                 request.Method = "POST";
                 request.ContentType = "application/x-www-form-urlencoded";

                 if (!string.IsNullOrEmpty(userAgent))
                 {
                     request.UserAgent = userAgent;
                 }
                 else
                 {
                     request.UserAgent = DefaultUserAgent;
                 }

                 if (timeout.HasValue)
                 {
                     request.Timeout = timeout.Value;
                 }
                 if (cookies != null)
                 {
                     request.CookieContainer = new CookieContainer();
                     request.CookieContainer.Add(cookies);
                 }
                 //如果需要POST数据
                 if (!(parameters == null || parameters.Count == ))
                 {
                     StringBuilder buffer = new StringBuilder();
                     int i = ;
                     foreach (string key in parameters.Keys)
                     {
                         if (i > )
                         {
                             buffer.AppendFormat("&{0}={1}", key, parameters[key]);
                         }
                         else
                         {
                             buffer.AppendFormat("{0}={1}", key, parameters[key]);
                         }
                         i++;
                     }
                     byte[] data = requestEncoding.GetBytes(buffer.ToString());
                     using (Stream stream = request.GetRequestStream())
                     {
                         stream.Write(data, , data.Length);
                     }
                 }

                 HttpWebResponse httpWebResponse = request.GetResponse() as HttpWebResponse;

                 StreamReader reader = new StreamReader(httpWebResponse.GetResponseStream(),
                     System.Text.Encoding.GetEncoding("utf-8"));

                 string html = "";
                 //获取请求到的数据
                 html = reader.ReadToEnd();

                 //关闭
                 httpWebResponse.Close();
                 reader.Close();

                 callback(html);

                 return httpWebResponse;
             }
             catch
             {
                 callback(null);
             }
             return null;
         }

         private static HttpWebResponse CreatePostHttpResponse(string url, string parameters, int? timeout,
             string userAgent, Encoding requestEncoding, CookieCollection cookies, Action<string> callback)
         {
             if (string.IsNullOrEmpty(url))
             {
                 return null;
                 //throw new ArgumentNullException("url");
             }
             if (requestEncoding == null)
             {
                 throw new ArgumentNullException("requestEncoding");
             }
             HttpWebRequest request = null;
             try
             {
                 //如果是发送HTTPS请求
                 if (url.StartsWith("https", StringComparison.OrdinalIgnoreCase))
                 {
                     ServicePointManager.ServerCertificateValidationCallback =
                         new RemoteCertificateValidationCallback(CheckValidationResult);
                     request = WebRequest.Create(url) as HttpWebRequest;
                     request.ProtocolVersion = HttpVersion.Version10;
                 }
                 else
                 {
                     request = WebRequest.Create(url) as HttpWebRequest;
                 }
                 request.Method = "POST";
                 request.ContentType = "application/x-www-form-urlencoded";

                 if (!string.IsNullOrEmpty(userAgent))
                 {
                     request.UserAgent = userAgent;
                 }
                 else
                 {
                     request.UserAgent = DefaultUserAgent;
                 }

                 if (timeout.HasValue)
                 {
                     request.Timeout = timeout.Value;
                 }
                 if (cookies != null)
                 {
                     request.CookieContainer = new CookieContainer();
                     request.CookieContainer.Add(cookies);
                 }
                 //如果需要POST数据
                 if (!string.IsNullOrEmpty(parameters))
                 {
                     using (var streamWriter = new StreamWriter(request.GetRequestStream()))
                     {
                         streamWriter.Write(parameters);
                         streamWriter.Flush();
                     }
                 }

                 HttpWebResponse httpWebResponse = request.GetResponse() as HttpWebResponse;

                 StreamReader reader = new StreamReader(httpWebResponse.GetResponseStream(),
                     System.Text.Encoding.GetEncoding("utf-8"));

                 string html = "";
                 //获取请求到的数据
                 html = reader.ReadToEnd();

                 //关闭
                 httpWebResponse.Close();
                 reader.Close();

                 callback(html);

                 return httpWebResponse;
             }
             catch
             {
                 callback(null);
             }
             return null;
         }

         private static bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain,
             SslPolicyErrors errors)
         {
             return true; //总是接受
         }

     }

使用方法

HttpQuery.Post(url, new { key = key, xmlCount = xmlCount }, (msg) =>
            {

            });