利用HttpWebRequest发送HTTP请求

 HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
                string param = BuildParamGetPatientInfoForSDEY(inHospitalID, caseNum); 
                logInfo.LogStepDetail(cCfg, "请求的JSON内容：", param);

                Encoding encoding = Encoding.UTF8;
                byte[] byteArray = Encoding.UTF8.GetBytes(param);
                req.Method = "POST";
                req.Headers.Add("access_token", token);
                req.ContentType = "application/json";
                req.ContentLength = byteArray.Length;
                req.Accept = "*/*";
                req.Timeout = 30 * 1000;
                req.ReadWriteTimeout = 30 * 1000;
                req.ServicePoint.Expect100Continue = false;

                using (Stream reqStream = req.GetRequestStream())
                {
                    reqStream.Write(byteArray, 0, byteArray.Length);
                }
                using (HttpWebResponse response = (HttpWebResponse)req.GetResponse())
                {
                    using (StreamReader reader = new StreamReader(response.GetResponseStream(), encoding))
                    {
                        responseDate = reader.ReadToEnd();
                        logInfo.LogStepDetail(cCfg, "POST请求的返回结果", responseDate);
                    }
                }
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