Hen a asynchronous method is executed, the code runs but nothing happens other than a compiler warning. What is most likely causing the method to not return anything?

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I found this question in an assessment form:

When a asynchronous method is executed, the code runs but nothing happens other than a compiler warning. What is most likely causing the method to not return anything?

(A) The return yield statement is missing at the end of the method.
(B) The yield keyword is missing from the method.
(C) The method is missing an await keyword in its body.
(D) The wait keyword is missing from the end of the method.

What I have tried:

This is a wierd question because the question ask for a wrong behaviour of your system. I don't know what to answer because I never experienced this. For me you cannot miss the await or wait otherwise your compiler give you an error. And the yield is not used for that purpose.

So this question is really confusing. What do you think?

Posted 2-Feb-21 16:19pm

Bastien Vandamme

Updated 2-Feb-21 23:18pm

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Gerry Schmitz · Answer 1 · 2021-02-02T17:44:00

Solution 1

It's a poor question; confusing an "await" and a "missing return value"; and "executing" while "nothing happens" (?).

An async method will run synchronously (with a warning) if there is no await. (C)

Posted 2-Feb-21 17:44pm

Gerry Schmitz

Richard Deeming · Answer 2 · 2021-02-02T23:18:00

Quote:
(A) The return yield statement is missing at the end of the method.

There is no such thing in C# as return yield. There is a yield return, but that's used in an iterator method. The only time you'd see that in an async method is if you're implementing an async enumerable[^] iterator. Since the question makes no mention of that, you can rule it out.

Quote:
(B) The yield keyword is missing from the method.

As above, yield only appears in iterator methods.

Quote:
(C) The method is missing an await keyword in its body.

As Gerry said, the method will run synchronously, and you will get a compiler warning. If it calls any Task-returning methods, it will potentially return before those tasks have completed.

Quote:
(D) The wait keyword is missing from the end of the method.

There is no wait keyword in C#.

By a process of elimination, the only possible correct answer is (C).