Waiting for async/await inside a task

Question

I have this construct in my main(), which creates

var tasks = new List();

var t = Task.Factory.StartNew(
    async () =>
    {
         


        

Answer 1

It's discouraged to use Task.Factory.StartNew with async-await, you should be using Task.Run instead:

var t = Task.Run(
    async () =>
    {
        Foo.Fim();
        await Foo.DoBar();
    });

The Task.Factory.StartNew api was built before the Task-based Asynchronous Pattern (TAP) and async-await. It will return Task because you are starting a task with a lambda expression which happens to be async and so returns a task. Unwrap will extract the inner task, but Task.Run will implicitly do that for you.

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For a deeper comparison, there's always a relevant Stephen Toub article: Task.Run vs Task.Factory.StartNew