private static string url = "https://localhost:44317/api/";
public static string PostRequestAPI(string apiName, Dictionary<string, object> parameters)
        {
            //实例化
            WebClient client = new WebClient();
            //地址
            string requestUrl = url + apiName;
            //数据较大的参数
            string datastr = "";
            foreach (var item in parameters)
            {
                datastr += item.Key + "=" + item.Value + "&";
            }
            datastr = datastr.Substring(0, datastr.Length - 1);
            //参数转流
            byte[] bytearray = Encoding.UTF8.GetBytes(datastr);
          
            

            string myParameters = "key=" + "123" + "&system_id=" + "123" + "";

            byte[] aaddd = Encoding.UTF8.GetBytes(myParameters);
            //采取POST方式必须加的header，如果改为GET方式的话就去掉这句话即可
            client.Headers.Add("Content-Type", "application/x-www-form-urlencoded");//长度
            client.Headers.Add("ContentLength", bytearray.Length.ToString());
            //上传，post方式，并接收返回数据（这是同步，需要等待接收返回值）
            byte[] responseData = client.UploadData(requestUrl, aaddd);
            //释放
            client.Dispose();
            //处理返回数据（一般用json）
            string srcString = Encoding.UTF8.GetString(responseData);
            return srcString;
        }
        public class use
        {
            public string name { get; set; }
            public string sex { get; set; }
        }

        /// <summary>
        /// Get方式请求接口
        /// </summary>
        /// <param name="apiNamespace"></param>
        /// <param name="apiName"></param>
        /// <param name="parameters"></param>
        public static string GetRequestAPI(string apiNamespace, string apiName, Dictionary<string, object> parameters)
        {
            //地址
            //string url = "https://gw.open.1688.com/openapi/param2/1/" + apiNamespace + "/" + apiName + "/";// + StaticInfo.AppKey + "?";
            string url = "http://192.168.2.237/api/" + apiNamespace + "/" + apiName + "?";
            foreach (var item in parameters)
            {
                url += item.Key + "=" + item.Value + "&";
            }
            url = url.Substring(0, url.Length - 1);
            //实例化
            WebClient client = new WebClient();
            //上传并接收数据
            Byte[] responseData = client.DownloadData(url);
            //接收返回的json的流数据，并转码
            string result = Encoding.UTF8.GetString(responseData);

            return result;
        }

        /// <summary>
        /// Get方式请求接口
        /// </summary>
        /// <param name="url">请求地址</param>
        /// <returns></returns>
        public static string GetRequestAPI(string url)
        {
            //实例化
            WebClient client = new WebClient();
            //上传并接收数据
            Byte[] responseData = client.DownloadData(url);
            //接收返回的json的流数据，并转码
            string result = Encoding.UTF8.GetString(responseData);

            return result;
        }