C# 调用web API时异步/等待不起作用

大家好，我有一个异步Web API，我想当我点击一个按钮执行它时，剩下的过程将不会继续，直到API返回结果，下面是我的API

btnSubmit.Click += async (sender, e) =>
    {
        var jobId = txtJobID.Text;

        if (txtJobID.Text.Length <= 0)
        {
            txtJobID.RequestFocus();
            txtJobID.SetError("Job ID required", iconError);
        }
        else
        {
            var request = HttpWebRequest.Create(string.Format("http://192.168.79.174:90/api/test/" + jobId));
            request.ContentType = "application/json";
            request.Method = "GET";




            using (HttpWebResponse response = await request.GetResponseAsync() as HttpWebResponse)
            {

                if (response.StatusCode != HttpStatusCode.OK)
                    Console.Out.WriteLine("Error fetching data. Server returned status code: {0}", response.StatusCode);

                using (StreamReader reader = new StreamReader(response.GetResponseStream()))
                {
                    var content = reader.ReadToEnd();

                    dynamic arr = JsonConvert.DeserializeObject(content);

                    foreach (dynamic obj in arr)
                    {
                        tvJobID.Text = obj.JobID;
                        tvJobType.Text = obj.JobType;
                        tvDueDate.Text = obj.DueDate;
                        tvVisitTime.Text = obj.Time;
                        tvVisitStatus.Text = obj.VisitStatus;
                        tvAddress1.Text = obj.Address1;
                        tvAddress2.Text = obj.Address2;
                        tvPostCode.Text = obj.PostCode;
                        tvAuthority.Text = obj.Authority;
                    }

                    if (content == null || content == "" || content == "[]")
                    {

                        //Console.Out.WriteLine("Response contained empty body...");

                        Toast.MakeText(ApplicationContext, "Invalid Job ID or no visits for this ID. Please try again", ToastLength.Long).Show();
                    }
                    else
                    {
                        layoutController.Visibility = ViewStates.Visible;


                    }
                }
            }
        }

    };

btnSubmit.Click+=async（发送方，e）=>
{
var jobId=txtJobID.Text；
如果（txtJobID.Text.Length相当长的一段时间是多长？您期望的时间范围是什么？您是否分析了web服务以找到任何瓶颈（如果应该存在的话）？为什么使用
动态
？在运行时之前您似乎不太可能真正知道web服务将返回的对象类型。@jst将应用程序冻结7-8秒onds。我看不到任何瓶颈，我想我在错误的地方使用了async/await。我可以在其他地方使用await吗。很抱歉，我对此了解很少。感谢不要使用
HttpWebRequest
使用
HttpClient
。它有一个非常易于使用的
async
api。