C#后端发送云吧推送

/// <summary>
        /// 发送云吧信息
        /// </summary>
        /// <param name="code"></param>
        /// <returns></returns>
        [HttpGet]
        public HttpResponseMessage SendMessage(string member_id,string member_platform,string title)
        {
            HttpResponseMessage result;
            dynamic o = new { exist = false };
            bool isExist = false;

            try
            {
                TimeSpan ts = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0);
                string timestamp = Convert.ToInt64(ts.TotalSeconds).ToString();
                string appkey = string.Empty;
                string app_master_secret = string.Empty;
                var param = new object();
                if (member_platform == "android")
                {
                    appkey = "appkey";
                    app_master_secret = "app_master_secret";
                    param = new
                    {
                        appkey = appkey,
                        timestamp = timestamp,
                        type = "customizedcast",
                        alias_type = "UserGroup",
                        alias = member_id,
                        payload = new
                        {
                            display_type = "notification",   //消息类型：消息
                            body = new
                            {
                                ticker = "通知栏提示文字",
                                title = title,
                                text = "通知文字描述",
                                after_open = "go_app"
                                //url = "",
                                //activity = model.activity == null ? "" : model.activity
                            },
                        },
                        policy = new
                        {
                            start_time = ""
                        }
                    };
                }
                else if (member_platform == "ios")
                {
                    appkey = "appkey";
                    app_master_secret = "app_master_secret";

                    param = new
                    {
                        appkey = appkey,
                        timestamp = timestamp,
                        type = "customizedcast",
                        alias_type = "UserGroup",
                        alias = member_id,
                        payload = new
                        {
                            aps = new                     // 必填 严格按照APNs定义来填写
                            {
                                alert = title       // 必填       
                            }
                        },
                        policy = new
                        {
                            start_time =""
                        },
                        production_mode = "false"
                    };
                }
                string url = "http://msg.umeng.com/api/send";
                var requestJson = JsonConvert.SerializeObject(param);
                string mysign = getMD5Hash("POST" + url + requestJson + app_master_secret);

                url = url + "?sign=" + mysign;
                HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
                request.Method = "POST";


                byte[] bs = Encoding.UTF8.GetBytes(requestJson);
                request.ContentLength = bs.Length;
                using (Stream reqStream = request.GetRequestStream())
                {
                    reqStream.Write(bs, 0, bs.Length);
                    reqStream.Close();
                }
                HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                HttpStatusCode statusCode = response.StatusCode;
                if (statusCode == System.Net.HttpStatusCode.OK)
                {
                    o = new { code = 1000, data = new { isExist = isExist }, msg = "发送成功" };
                }
                else
                {
                    o = new { code = 1000, data = new { isExist = isExist }, msg = "发送失败" };
                }
            }
            catch (WebException e)
            {
                o = new { code = 3000, data = new { }, msg = e.Message };
            }

            string json = JsonConvert.SerializeObject(o);
            result = new HttpResponseMessage { Content = new StringContent(json, Encoding.GetEncoding("UTF-8"), "application/json") };

            return result;
        }

        public static String getMD5Hash(String str)
        {
            System.Security.Cryptography.MD5 md5 = new MD5CryptoServiceProvider();
            byte[] result = md5.ComputeHash(System.Text.Encoding.UTF8.GetBytes(str));
            StringBuilder strReturn = new StringBuilder();


            for (int i = 0; i < result.Length; i++)
            {
                strReturn.Append(Convert.ToString(result[i], 16).PadLeft(2, '0'));
            }
            return strReturn.ToString().PadLeft(32, '0');
        }