C# async/await strange behavior in console app

Question

I built some async/await demo console app and get strange result. Code:

class Program
{
    public static void BeginLongIO(Action act)
    {
        Console.         


        

Answer 1

Short answer is that LongIOAsync() is blocking. If you run this in a GUI program you will actually see the GUI freezes briefly - not the way async/await is supposed to work. Therefore the entire thing falls apart.

You need to wrap all the long running operations in a Task then directly await on that Task. Nothing should block during that.