Should I avoid ‘async void’ event handlers?

by

The guideline is to avoid async void except when used in an event handler, so using async void in an event handler is OK.

That said, for unit testing reasons I often like to factor out the logic of all async void methods. E.g.,

public async Task OnFormLoadAsync(object sender, EventArgs e)
{
  await Task.Delay(2000);
  ...
}

private async void Form_Load(object sender, EventArgs e)
{
  await OnFormLoadAsync(sender, e);
}

More Related Contents:

  1. How and when to use ‘async’ and ‘await’
  2. If async-await doesn’t create any additional threads, then how does it make applications responsive?
  3. HttpClient.GetAsync(…) never returns when using await/async
  4. Running multiple async tasks and waiting for them all to complete
  5. How do yield and await implement flow of control in .NET?
  6. Fire and forget async method in asp.net mvc
  7. Task sequencing and re-entracy
  8. Enforce an async method to be called once
  9. Why use Async/await all the way down
  10. A reusable pattern to convert event into task
  11. Async and await – difference between console, Windows Forms and ASP.NET
  12. Different forms of the WCF service contract interface
  13. How does async works in C#?
  14. Why use async and return await, when you can return Task directly?
  15. Executing tasks in parallel
  16. Should I worry about “This async method lacks ‘await’ operators and will run synchronously” warning
  17. Proper way to start and fire-and-forget asynchronous calls?
  18. Use Task.Run() in synchronous method to avoid deadlock waiting on async method?
  19. A pattern for self-cancelling and restarting task
  20. Async always WaitingForActivation
  21. What is the correct way to cancel an async operation that doesn’t accept a CancellationToken?
  22. A pattern to pause/resume an async task?
  23. Async thread body loop, It just works, but how?
  24. Converting async/await to Task.ContinueWith
  25. Horrible performance using SqlCommand Async methods with large data
  26. How to Async Files.ReadAllLines and await for results?
  27. Async and Await with For Loop [duplicate]
  28. Await and SynchronizationContext in a managed component hosted by an unmanaged app
  29. When is the best place to use Task.Result instead of awaiting Task
  30. Timeout pattern on task-based asynchronous method in C#

Leave a Comment