How to stop HttpClient.GetAsync(uri) from hanging?

Question

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• C# asynchronous method - help needed 3 answers

I have the following code that I'm using to call a uri:

var uri = string.Format("Helpers/ProfileList/Online/?locationId=0&skip=0&take={0}", numProfiles);
HttpResponseMessage response = await client.GetAsync(uri);
response.EnsureSuccessStatusCode();

The uri is pointing at a custom web api uri (which I can debug and follow through). However, when the last return statement in the api has been called, nothing seems to happen. It should go to the response.EnsureSuccessStatusCode(); line, but it's not. It just seems to be hanging.

Answer 1

My spidey-sense tells me that further up your call stack your code is blocking on a returned task, e.g., Task.Wait or Task<T>.Result. By default, this will cause a deadlock that I explain on my blog.

To fix it, replace Task.Wait and Task<T>.Result with await.