ASP.NET Core 3 and React

Mixing asynchronous and synchronous code

An easy mistake to make is to mix asynchronous code with synchronous code. In fact, we have made this mistake in our PostAnswer action method because the method is synchronous but the call to the SignalR hub is asynchronous:

[HttpPost("answer")]public ActionResult<AnswerGetResponse>   PostAnswer(AnswerPostRequest answerPostRequest){  ...  _questionHubContext.Clients.Group(      $"Question-{answerPostRequest.QuestionId.Value}")    .SendAsync(      "ReceiveQuestion",       _dataRepository.GetQuestion(answerPostRequest.QuestionId.Value)  );  return savedAnswer;}

The code functions correctly but is suboptimal because not only is the thread that handles the request blocked from handling other requests, but we also have all of ...