使用await GetResponseAsync（）时出现死锁(Deadlock when using await GetResponseAsync())

 我已经使用visual studio 2015中的控制台应用程序成功将json数据拉入字符串。现在我已经尝试复制这个用于wpf，但我发现我不能使用.GetResponse（）而且我必须使用GetResponseAsync （）代替。 谷歌搜索了一段时间后，我想我理解async / await的观点，但我似乎陷入了僵局。 所以这是我目前的代码： 
 
 这是从Web API提取返回数据并返回JSON字符串的异步方法。 或者在本例中为Task<String> 。 
 
public async static Task<String> GetTrola(string station)
        {
            var url = "http://www.trola.si/" + station;

            string text;

            HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
            request.Accept = "application/json";

            var answer = (HttpWebResponse)(await request.GetResponseAsync());

            using (var sr = new StreamReader(answer.GetResponseStream()))
            {
                text = sr.ReadToEnd();
            }
            return text;
        }
 
 然后我在按钮单击事件中调用该函数，如下所示： 
 
string station = textBox.Text.ToString();
string output = GetJson.Trola.GetTrola(station).Result;
var myObject = JsonConvert.DeserializeObject<Result>(output);
 
 但我认为问题出在GetData函数中，特别是这一行： 
 
var answer = (HttpWebResponse)(await request.GetResponseAsync());
 
 我不知道为什么会发生这种情况，因为我等待使用await关键字的请求？ 我还缺少别人的东西？ 

I've successfully pulled json data into a string using a console application in visual studio 2015. Now I've tried to replicate this for wpf, but I've found I can't use .GetResponse() and I have to use GetResponseAsync() instead. After googling for a while I think I understand the point of async/await but I seem to be stuck in a deadlock. So here is my current code:
 
This is the async method that pulls the return data from a web API and returns a JSON string. Or in this case a Task<String>.
 
public async static Task<String> GetTrola(string station)
        {
            var url = "http://www.trola.si/" + station;

            string text;

            HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
            request.Accept = "application/json";

            var answer = (HttpWebResponse)(await request.GetResponseAsync());

            using (var sr = new StreamReader(answer.GetResponseStream()))
            {
                text = sr.ReadToEnd();
            }
            return text;
        }
 
I then call the function in a button click event, like this:
 
string station = textBox.Text.ToString();
string output = GetJson.Trola.GetTrola(station).Result;
var myObject = JsonConvert.DeserializeObject<Result>(output);
 
But I think the problem is in the GetData function in particular this line:
 
var answer = (HttpWebResponse)(await request.GetResponseAsync());
 
I don't know why it happens, since i awaited the request with the await keyword? Something else I'm missing?

原文：https://stackoverflow.com/questions/34466272