POST多对象提交方式

方法一：直接使用

 //string _url = "https://oapi.dingtalk.com/robot/send?access_token";
 ////json参数
 //string jsonParam = "{msgtype: \"markdown\",markdown:{title: \"异常测试1\",text: \"车牌号豫A88999\"},at:{isAtAll: \"true\"}}";
 //var request = (HttpWebRequest)WebRequest.Create(_url);
 //request.Method = "POST";
 //request.ContentType = "application/json;charset=UTF-8";
 //byte[] byteData = Encoding.UTF8.GetBytes(jsonParam);
 //int length = byteData.Length;
 //request.ContentLength = length;
 //Stream writer = request.GetRequestStream();
 //writer.Write(byteData, 0, length);
 //writer.Close();
 //var response = (HttpWebResponse)request.GetResponse();
 //var responseString = new StreamReader(response.GetResponseStream(), Encoding.GetEncoding("utf-8")).ReadToEnd();
 //MessageBox.Show(responseString.ToString());

方法二：封装函数使用：

 try
 {
     string PostUrl1 = "https://oapi.dingtalk.com/robot/send?access_token";
     string errorStr = string.Format("车牌信息：豫A88888\r\n车道编号：01\r\n采样完成时间：{0}\r\n取样重量：0.26", DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"));
     var patientinfo = "{msgtype: \"markdown\",markdown:{title: \"异常测试1\",text: \""+ errorStr + "\"},at:{isAtAll: \"true\"}}";
     
     //string sendData = JsonConvert.SerializeObject(patientinfo);
     string m = HttpPost(PostUrl1, patientinfo);
     JObject jos = (JObject)JsonConvert.DeserializeObject(m);
     RecordLog(string.Format("接收钉钉返回信息msg：{0}；code:{1}", jos["errmsg"].ToString(), jos["errcode"].ToString()));
 }
 catch (Exception ex)
 {
     string exstr = string.Format(string.Format("钉钉Message sent ERROR：{0}", ex.Message));
     RecordLog(exstr);
     MessageBox.Show(exstr);

 }

两种方式是一摸一样的代码，花了一天的时间测试出来问题出在josn串格式不对才一直发送失败