How do I start in C# a function that's async from a function that isn't?

Question

I have a function that isn't async and as a result I can't use await. In that function I call a function that's async.

My coworker suggested I use:

private void Foo()
{
   var _ = BarAsync();
}

This way however has the disadvantage that I don't get notified when the function throws errors. Is there a better way to call the function? I don't care whether or not the function gets executed asyncronly.

You can synchronously block on it using `Wait` -> `BarAsync().Wait();` — Alexander Derck, Nov 29 '18 at 09:49
I'm trying to get the MS docs updated with this information. Go vote on this: https://github.com/dotnet/docs/issues/7995 — Martin Brown, Nov 29 '18 at 09:58
@AlexanderDerck : Does that allow me to receive Expection that get throw within the function? — Christian, Nov 29 '18 at 10:25

score 0 · Answer 1 · edited Nov 29 '18 at 09:53

0

var result = BarAsync()?.Result;

Or

var runningTask = BarAsync();
runningTask.Wait();
var result = runningTask?.Result;

edited Nov 29 '18 at 09:53

Liam

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answered Nov 29 '18 at 09:51

Martijn Vaandering

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this is a very bad idea in the general case - and can even cause hard deadlocks; the **only** time you should *ever* access `.Result` is if you have checked and you *know* that it has completed – Marc Gravell Nov 29 '18 at 09:53
1

@Liam both can :) – Marc Gravell Nov 29 '18 at 09:53

How do I start in C# a function that's async from a function that isn't?

1 Answers1