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

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
– Alexander Derck, Commented Nov 29, 2018 at 9:49
I'm trying to get the MS docs updated with this information. Go vote on this: github.com/dotnet/docs/issues/7995 — Martin Brown
– Martin Brown, Commented Nov 29, 2018 at 9:58
@AlexanderDerck : Does that allow me to receive Expection that get throw within the function? — Christian
– Christian, Commented Nov 29, 2018 at 10:25

Liam · Accepted Answer · 2018-11-29 09:53:16Z

0

var result = BarAsync()?.Result;

Or

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

edited Nov 29, 2018 at 9:53

Liam

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answered Nov 29, 2018 at 9:51

Martijn Vaandering

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2 Comments

Marc Gravell Over a year ago

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 Over a year ago

@Liam both can :)

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