C#•10mo ago

Can you await a Task and return Task<bool> (with a constant bool value) without the `await` keyword?

I came up with this code which does what I want:

Task myTask = ...
return myTask.ContinueWith(t => true);

Task myTask = ...
return myTask.ContinueWith(t => true);

but the problem is that the t => true part ends up being executed on a worker thread, even if myTask is completed (e.g. status is RanToCompletion). Is there a proper way to do this without checking if myTask is completed?

23 Replies

Tvde1•10mo ago

Why don't you want to use await?

br4kejet•10mo ago

Trying to reduce how much I use it because it makes the stack frames really messy

Tvde1•10mo ago

is that still a thing nowadays?

Task<bool> MethodWithoutAwait()
{
    Task sometask = DoStuff();
    return WrapInBool(someTask);
}

async Task<bool> WrapInBool(Task t)
{
    await t;
    return true;
}

Task<bool> MethodWithoutAwait()
{
    Task sometask = DoStuff();
    return WrapInBool(someTask);
}

async Task<bool> WrapInBool(Task t)
{
    await t;
    return true;
}

br4kejet•10mo ago

Still uses await though 😦

Tvde1•10mo ago

you can't avoid using await 😬 if you use ContinueWIth you get even worse problems

br4kejet•10mo ago

I guess I could just do return myTask.IsCompleted ? Task.FromResult(true) : myTask.ContinueWith(t => true)... still kinda messy though but at least it works

Tvde1•10mo ago

are you using a modern .NET version? I also like to avoid Exceptions as much as possible

br4kejet•10mo ago

.NET Standard 2.0

JakenVeina•10mo ago

that was resolved years ago, what is your tooling setup?

br4kejet•10mo ago

What's that?

JakenVeina•10mo ago

do not try and re-invent awaiting, it's not trivial whatever is giving you "messy" stack traces

br4kejet•10mo ago

You mean IDE? I'm using rider

br4kejet•10mo ago

this is what I mean by messy stack trace though

JakenVeina•10mo ago

...what would you expect it to look like? That is everything that a stack trace should be

br4kejet•10mo ago

Would prefer it without the purple lines 😛

JakenVeina•10mo ago

it shows the logical chain of calls that brought you to where you are now because those things aren't your code? that's a UI issue, there's a setting for that

br4kejet•10mo ago

Well more that it's just filler stuff that doesn't tell me much apart from that it's an async method I wish there was 😦 I think i'm just gonna switch back to async, the code just looks better apart from the stack trace

JakenVeina•10mo ago

there is in VS

JakenVeina•10mo ago

https://rider-support.jetbrains.com/hc/en-us/community/posts/360010726179-Rider-Debugger-shows-external-call-stack-frames-as-just-External-code-n-frames-

Rider Support | JetBrains

Rider Debugger shows external call stack frames as just "[External ...

At some point in the last year, the new "[External code: n frames]" format started appearing in this call stack window in the debugger. IIRC, before this, you could at least see the names of the me...

br4kejet•10mo ago

Visual studio's stack trace window is pretty much unintelligible anyway, just looks like a mush of the same colour text

reflectronic•10mo ago

the fix is to hide the purple lines, not mess up your code

reflectronic•10mo ago

or to use tools for async debugging like https://www.jetbrains.com/help/rider/Debugging_Multithreaded_Applications.html

JetBrains Rider Help

Debug multithreaded applications | JetBrains Rider

Accord•10mo ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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Programming

Can you await a Task and return Task<bool> (with a constant bool value) without the `await` keyword?