【后端C#】后台通过http post 调用 webservice 的方法

定义http post 调用webservice的某个方法

 /// <summary>
     /// http Post调用  WebService
     /// </summary>
     public static XmlDocument Test1_QueryPostWebService(String URL,
         String MethodName, Hashtable Pars)
     {

  HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(URL + "/" + MethodName);
         request.Method = "POST";
         request.ContentType = "application/x-www-form-urlencoded";
         request.Credentials = CredentialCache.DefaultCredentials;
         request.Timeout = ;

         #region 参数拼接成字符串，最后编码
         StringBuilder sb = new StringBuilder();
         foreach (string k in Pars.Keys)
         {
             if (sb.Length > )
             {
                 sb.Append("&");
             }
             sb.Append(
                 HttpUtility.UrlEncode(k) + "="
                 + HttpUtility.UrlEncode(Pars[k].ToString())
                 );

         }
         byte[] data = Encoding.UTF8.GetBytes(sb.ToString());
         #endregion

         #region  把编码后的参数写入请求流中
         request.ContentLength = data.Length;
         Stream writer = request.GetRequestStream();
         writer.Write(data, , data.Length);
         writer.Close();
         #endregion

         #region 读取结果，创建XmlDocument对象，对象加载结果
         var response = request.GetResponse();
         StreamReader sr = new StreamReader(response.GetResponseStream(), Encoding.UTF8);
         String retXml = sr.ReadToEnd();
         sr.Close();
         XmlDocument doc = new XmlDocument();
         doc.LoadXml(retXml);
         #endregion 

   return doc;

     }
  

调用实例：

 protected void Page_Load(object sender, EventArgs e)
         {
             Hashtable pars = new Hashtable();
             String Url = "http://localhost:63596/WebService1.asmx";
             pars["aa"] = "HelenZhou";
             XmlDocument doc = WebSvcCaller.
                 Test1_QueryPostWebService(Url,
                 "MyHelloWorld",
                 pars);
             Response.Write(doc.OuterXml);
         }