Async wait block Main UI

Question

I am using the new async await features to upgrade from backgroundworker in C#. In the following code I am trying to replicate the execution of multiple tasks with ContinueW

Answer 1

If you're going to use the Task-based Asynchronous Pattern, then you should use the recommended guidelines. I have an MSDN article describing many of them.

In particular:

• Use Task.Run instead of the Task constructor with Task.Start.
• Use await instead of ContinueWith.
• Do not use AttachedToParent.

If you apply these changes, your code will then look like this:

try
{
  await Task.Run(() =>
  {
    Thread.Sleep(10000);

    // make the Task throw an exception
    MessageBox.Show("This is T1");
  });
  await Task.Run(() =>
  {
    Thread.Sleep(1000);
    MessageBox.Show("This is Continuation");
  });
}
catch (Exception ex)
{
  MessageBox.Show(ex.Message);
}