C#中使用自定义钉钉机器人向群发送消息

1、              

                    private string WEB_HOOK = "https://oapi.dingtalk.com/robot/send?access_token=xxxxx";                 

                    try
                    {
                        string msg = "发送总次数: "+sum_count.ToString()+"程序运行总时间："+sp.ToString();
                        String textMsg = "{ \"msgtype\": \"text\", \"text\": {\"content\": \"" + msg + "\"}}";
                        string s = Post(WEB_HOOK, textMsg, null);
                        MessageBox.Show(s);
                    }
                    catch (Exception ex)
                    {
                        MessageBox.Show(ex.Message);
                    }

2、

        ///

        /// 以Post方式提交命令
        ///

        /// 请求的URL
        /// 请求的json参数
        /// 请求头的key-value字典
        public static String Post(string apiurl, string jsonString, Dictionary headers = null)
        {
            WebRequest request = WebRequest.Create(@apiurl);
            request.Method = "POST";
            request.ContentType = "application/json";
            if (headers != null)
            {
                foreach (var keyValue in headers)
                {
                    if (keyValue.Key == "Content-Type")
                    {
                        request.ContentType = keyValue.Value;
                        continue;
                    }
                    request.Headers.Add(keyValue.Key, keyValue.Value);
                }
            }

            if (String.IsNullOrEmpty(jsonString))
            {
                request.ContentLength = 0;
            }
            else
            {
                byte[] bs = Encoding.UTF8.GetBytes(jsonString);
                request.ContentLength = bs.Length;
                Stream newStream = request.GetRequestStream();
                newStream.Write(bs, 0, bs.Length);
                newStream.Close();
            }

            WebResponse response = request.GetResponse();
            Stream stream = response.GetResponseStream();
            Encoding encode = Encoding.UTF8;
            StreamReader reader = new StreamReader(stream, encode);
            string resultJson = reader.ReadToEnd();
            return resultJson;
        }