c# http请求

c#httpclient可以方便的进行http请求，而且是异步的。贼溜

            var values = new Dictionary<string, string>
            {
                {"uid","uva_"+this.id.ToString() },
                { "x_pos",x},
                { "y_pos",y}
            };
            var content = new FormUrlEncodedContent(values);
            try
            {
                HttpClient client = new HttpClient();
                var response = await client.PostAsync(Global.POSTION_POST_URL, content);

                var responseString = await response.Content.ReadAsStringAsync();
                Trace.WriteLine(responseString.ToString());
            }
            catch (Exception e)
            {
                Trace.WriteLine(e.StackTrace);
                Trace.WriteLine(e.Message);
                //throw;
            }