调用API post请求

      public static  string GetBabyByKey(string babykey)
        {
            string APIUrl = ConfigurationManager.AppSettings["APIUrl"];
            string opentoken = ConfigurationManager.AppSettings["opentoken"];
            string openkey = ConfigurationManager.AppSettings["openkey"];
            string storeid = ConfigurationManager.AppSettings["storeid"];
            if (string.IsNullOrEmpty(APIUrl) || string.IsNullOrEmpty(opentoken) || string.IsNullOrEmpty(openkey))
            {
                throw new Exception("接口配置错误");
            }
            Hashtable ht = new Hashtable();
            ht.Add("BabyKey", babykey);
            ht.Add("StoreId", storeid);
            string jsondata = JsonHelper.ToJson(ht);
            string data = "?openkey=" + openkey + "&apitoken=" + opentoken + "&act=GetBabyByKey&jparam=" + jsondata;
            return Send("", APIUrl+ data);

        }

        private const string sContentType = "application/json";

        public static string Send(string data, string url)
        {
            return Send(Encoding.GetEncoding("UTF-8").GetBytes(data), url);
        }

        public static string Send(byte[] data, string url)
        {
            Stream responseStream;
            HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
            if (request == null)
            {
                throw new ApplicationException(string.Format("Invalid url string: {0}", url));
            }
            request.ContentType = sContentType;
            request.Method = "POST";
            request.ContentLength = data.Length;
            Stream requestStream = request.GetRequestStream();
            requestStream.Write(data, 0, data.Length);
            requestStream.Close();
            try
            {
                responseStream = request.GetResponse().GetResponseStream();
            }
            catch (Exception exception)
            {
                throw exception;
            }
            string str = string.Empty;
            using (StreamReader reader = new StreamReader(responseStream, Encoding.GetEncoding("UTF-8")))
            {
                str = reader.ReadToEnd();
            }
            responseStream.Close();
            return str;
        }