C#(asp.net )读取ASHX文件（一般处理程序）

c#后台获取asxh的返回数据，后台创建一个请求实例，获取请求实例的返回值

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public string GetResponseByPost(string apiUrl, string queryString) {     string responseString = string.Empty;     HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(apiUrl + queryString);     request.ContentType = "text/html";     request.Method = "POST";     request.ContentLength = queryString.Length;     request.Timeout = 20000;     byte[] bytes = Encoding.UTF8.GetBytes(queryString);     Stream os = null;     try     { // send the Post         request.ContentLength = bytes.Length;   //Count bytes to send         os = request.GetRequestStream();         os.Write(bytes, 0, bytes.Length);         //Send it     }     catch (WebException ex)     {         throw ex;     }     finally     {         if (os != null)         {             os.Close();         }     }       HttpWebResponse response = null;     try     {         response = (HttpWebResponse)request.GetResponse();         using (StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8))         {             responseString = reader.ReadToEnd();         }     }     catch (Exception ex2)     {         throw ex2;     }     finally     {         if (response != null)             response.Close();     }     return responseString; }

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