C# calls the Web API using RestClient

		/// <summary>
        /// Get Token        /// </summary>
        /// <returns></returns>
        public static async Task<string> GetToken()
        {
            var url = $"http://127.0.0.1/terminal-tenant/sys/login";
            var client = new RestClient(url);
            var request = new RestRequest();
             = ;
            var body = new { username = "xxx", password = "xxx" };
            ("application/json; charset=utf-8", (body), );
            IRestResponse response = (request);
            var responseContent = ;
            return responseContent;
        }

		/// <summary>
        /// Save data        /// </summary>
        /// <returns></returns>
        public async Task<string> Save(Model model, string token)
        {
            var url = $"http://127.0.0.1/terminal-tenant/app/visitor/save";
            var client = new RestClient(url);
            var request = new RestRequest();
             = ;
            ("token", token);
            ("application/json; charset=utf-8", (model), );
            IRestResponse response = (request);
            var responseContent = ;
            return responseContent;
        }

		/// <summary>
        /// Upload file        /// </summary>
        /// <param name="bt"></param>
        /// <param name="token"></param>
        /// <returns></returns>
        public async Task<string> Upload(byte[] bt, string token)
        {
            var url = $"http://127.0.0.1/terminal-tenant/tenant/common/upload";
            var client = new RestClient(url);
            var request = new RestRequest();
             = ;
            ("token", token);
            ("file", bt, "multipart/form-data");
            IRestResponse response = (request);
            var responseContent = ;
            return responseContent;
        }