C#•2y ago

✅ Awaiting a method exits program

I don't why but awaiting this method will result in the code exiting with only ever reaching Checkpoint A. While this has let me to believe that there was some error in the method I'm calling I added a debug message. This debug message is also never displayed before the program exits. Same applies when creating a list of tasks and awaiting them with Task.WhenAll(). Is there anything super simple I'm missing?

foreach (var link in outstanding)
                {
                    Console.WriteLine("Checkpoint A");
                    docs.Add(await Scraper.ScrapFromLinkAsync(link));
                    Console.WriteLine("Checkpoint B");
                }

foreach (var link in outstanding)
                {
                    Console.WriteLine("Checkpoint A");
                    docs.Add(await Scraper.ScrapFromLinkAsync(link));
                    Console.WriteLine("Checkpoint B");
                }

26 Replies

phaseshift•2y ago

Use the debugger. Sounds like there is an exception being thrown $debug

MODiX•2y ago

https://docs.microsoft.com/en-us/visualstudio/get-started/csharp/tutorial-debugger?view=vs-2022

Tutorial: Debug C# code - Visual Studio (Windows)

Learn features of the Visual Studio debugger and how to start the debugger, step through code, and inspect data in a C# application.

Jona4PlayOP•2y ago

That is the weird part though. No exception thrown. It just exits out and never calls the method its supposed to

333fred•2y ago

There is probably an exception being thrown. Debug->Windows->Exceptions, check the box for all managed exceptions, and try again

Jona4PlayOP•2y ago

You mean this?

Jona4PlayOP•2y ago

Still no exception thrown with these changes

Anton•2y ago

you probably aren't awaiting the task of the method that this code is in try doing a try catch around that scraper and you'll see the exception

Jona4PlayOP•2y ago

try
                    {
                        docs.Add(await Scraper.ScrapFromLinkAsync(link));
                    }
                    catch (Exception)
                    {
                        throw;
                    }

try
                    {
                        docs.Add(await Scraper.ScrapFromLinkAsync(link));
                    }
                    catch (Exception)
                    {
                        throw;
                    }

Still no luck with this

phaseshift•2y ago

That is kinda pointless

Jona4PlayOP•2y ago

It is, but it was upon the suggestion

phaseshift•2y ago

You'll need to show more code

Jona4PlayOP•2y ago

Was about to

phaseshift•2y ago

Particularly the entire async stack Please no async void

Jona4PlayOP•2y ago

It isnt 😅

Jona4PlayOP•2y ago

This is the method in Question.

message.txt

phaseshift•2y ago

$code

MODiX•2y ago

To post C# code type the following: ```cs // code here ``` Get an example by typing $codegif in chat If your code is too long, post it to: https://paste.mod.gg/

Jona4PlayOP•2y ago

and this is the main stack. cant use the code format as its to long

message.txt

phaseshift•2y ago

Then use a paste site

Jona4PlayOP•2y ago

ok sure

Jona4PlayOP•2y ago

https://pastebin.com/RaT2WyMc

Pastebin

Main: private static async void RunScraper() { //Called RunScra...

Pastebin.com is the number one paste tool since 2002. Pastebin is a website where you can store text online for a set period of time.

Jona4PlayOP•2y ago

It is ugly code still but I'll save refactoring for last

phaseshift•2y ago

async void... First thing I see is async void You been telling porkies I need to head out for a bit

Jona4PlayOP•2y ago

bruh. Youre so right i am awaiting it in main but it obvously doesnt do anything

phaseshift•2y ago

Yup You can't await it async Task, yes

Jona4PlayOP•2y ago

well huuuuge thanks to you. That might be the dumbest mistake I ever got stuck on for a whole day Closing the threat then. Have a great day

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✅ Awaiting a method exits program