c# winform 访问WebServices （通过Http方式）

         [WebMethod]

         public void PostJson(string str, string bb)

         {

             Dictionary<string, object> DictResult = new Dictionary<string, object>();

             IList<Dictionary<string, string>> list = new List<Dictionary<string, string>>();

             /*此处提供的只是示例，实际项目中，按照具体业务*/

             for (int ii = ; ii < ; ii++)

             {

                 Dictionary<string, string> dict = new Dictionary<string, string>();

                 dict.Add("str", str);

                 dict.Add("bb", bb);

                 list.Add(dict);

             }

             /*此处提供的只是示例，实际项目中，按照具体业务*/

             if (str == "")

             {

                 DictResult.Add("Code", "");

                 DictResult.Add("Msg", "访问成功");

                 DictResult.Add("Result", list);

             }

             else

             {

                 DictResult.Add("Code", "-1");

                 DictResult.Add("Msg", "访问失败");

                 DictResult.Add("Result", null);

             }

             Tools.ConvertToJson(DictResult);

         }

  string HttpPost(string URL, string Para)

         {

             // 创建HttpWebRequest对象

             HttpWebRequest httpRequest = (HttpWebRequest)WebRequest.Create(URL);

             httpRequest.Method = "POST";

             httpRequest.ContentType = "application/x-www-form-urlencoded";

             byte[] bytes = Encoding.UTF8.GetBytes(Para);

             using (Stream reqStream = httpRequest.GetRequestStream())

             {

                 reqStream.Write(bytes, , bytes.Length);

                 reqStream.Flush();

             }

             try

             {

                 using (HttpWebResponse myResponse = (HttpWebResponse)httpRequest.GetResponse())

                 {

                     StreamReader sr = new StreamReader(myResponse.GetResponseStream(), Encoding.UTF8);

                     string responseString = sr.ReadToEnd();

                     return responseString;

                 }

             }

             catch (WebException ex)

             {

                 var res = (HttpWebResponse)ex.Response;

                 StreamReader sr = new StreamReader(res.GetResponseStream(), Encoding.UTF8);

                 string str = sr.ReadToEnd();

                 return str;

             }

         }

   private void button1_Click(object sender, EventArgs e)

         {

             string url = "http://localhost:6029/TestServ.asmx/PostJson";

             string Para = "str=11&bb=AA";

             textBox1.Text = HttpPost(url, Para);

         }