/// <summary>

        /// 调用api返回json

        /// </summary>

        /// <param name="url">api地址</param>

        /// <param name="jsonstr">接收参数</param>

        /// <param name="type">类型</param>

        /// <returns></returns>

        public static string HttpApi(string url, string jsonstr, string type)

        {

            Encoding encoding = Encoding.UTF8;

            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);//webrequest请求api地址

            request.Accept = "text/html,application/xhtml+xml,*/*";

            request.ContentType = "application/json";

            request.Method = type.ToUpper().ToString();//get或者post

            byte[] buffer = encoding.GetBytes(jsonstr);

            request.ContentLength = buffer.Length;

            request.GetRequestStream().Write(buffer, , buffer.Length);

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();

            using (StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8))

            {

                return reader.ReadToEnd();

            }

        }