C#•2y ago

✅ ObjectDisposedException without explicit trace

Hello, I'm getting exception at different moment, but I don't really understand what is happening.
The stacktrace does not target any lines of my program, how can I find where the issue is ?
Thanks !

LDamiOP•4/25/24, 11:26 AM

It's a .NET 6.0 console app

TeBeCo•4/25/24, 11:29 AM

show the full code

TeBeCo•4/25/24, 11:29 AM

can't guess randomly stuff

LDamiOP•4/25/24, 11:32 AM

That is the weird part, it crashes at different moment, it's not easy to show. I'll try to crash it again to show

TeBeCo•4/25/24, 11:34 AM

or just share the code now, on where it thrown before

TeBeCo•4/25/24, 11:34 AM

that's works too

TeBeCo•4/25/24, 11:34 AM

TeBeCo•4/25/24, 11:35 AM

code looks small

TeBeCo•4/25/24, 11:35 AM

$paste

TTeBeCo $paste

MODiX•4/25/24, 11:35 AM

If your code is too long, you can post to https://paste.mod.gg/ and copy the link into chat for others to see your shared code!

LDamiOP•4/25/24, 11:35 AM

It was the SafeHandle.cs file, it's a Microsoft one

TeBeCo•4/25/24, 11:35 AM

no i mean your code

TeBeCo•4/25/24, 11:36 AM

what is YOUR code that runs .. and eventually something throw

TeBeCo•4/25/24, 11:36 AM

show the code from your console app

LDamiOP•4/25/24, 11:42 AM

The exception is thrown here:
(but that is not my code)

LDamiOP•4/25/24, 11:43 AM

Oh I think I got it

LDamiOP•4/25/24, 11:43 AM

I try to open a file that might by already opened by another program

TeBeCo•4/25/24, 11:44 AM

you're not supposed to debug that code

TeBeCo•4/25/24, 11:44 AM

that's why I was asking for .. YOUR code

TeBeCo•4/25/24, 11:44 AM

assume the Runtime / BCL code is very rarly bugged

TeBeCo•4/25/24, 11:45 AM

meaning that the context that matter is generally your code calling this

LDamiOP•4/25/24, 11:47 AM

The fact is that I didn't know where the execution was stopped, it's a big program, and there was no indication (nothing in the stacktrace) to say "it stopped here in your code"

LDamiOP•4/25/24, 11:48 AM

but anyway, thanks for your help !

LDamiOP•4/25/24, 11:51 AM

That is not solve, the exception was thrown again, I don't know why !
To explain: I develop a game mode for a multiplayer game, I try to make a NPC script. I thought it was crashing because the NPC needs a file and I didn't put a try catch on the file reader.
Now the same exception is thrown before the file reading, that is a nonsense

LDamiOP•4/25/24, 11:54 AM

It seems to have thrown the exception here this time:

becquerel•4/25/24, 3:59 PM

are you using multithreading in any way

becquerel•4/25/24, 4:00 PM

in particular are you trying to work with the same file from multiple threads or something

TeBeCo•4/25/24, 4:33 PM

the error is an object disposed exception

TeBeCo•4/25/24, 4:33 PM

i suspect a static car somewhere or shared car over thread yeah

LDamiOP•4/25/24, 5:56 PM

I'm not really sure if I use multithreading, I use a wrapper (originally the multiplayer game modes are scripted in C++, and I use a wrapper to create a .dll that is used by the server)
I don't know exactly how it works, but it worked well for a long time, I might be doing something wrong

TTeBeCo i suspect a static car somewhere or shared car over thread yeah

LDamiOP•4/25/24, 5:56 PM

what do you mean by car ?

TeBeCo•4/25/24, 5:56 PM

var

TeBeCo•4/25/24, 5:57 PM

any call to .Dispose anywhere i your code ?

LDamiOP•4/25/24, 5:57 PM

Yes maybe, but how can I see what var is causing the issue ?

TeBeCo•4/25/24, 5:57 PM

or using (){}

LDamiOP•4/25/24, 6:00 PM

There are a lot of .Dispose(), but usually the exception is thrown on the line where I try to access the variable. Example:

Vehicle veh = new();
veh.Dispose();
TeleportPlayerTo(veh.Position); // Exception should be thrown here

Vehicle veh = new();
veh.Dispose();
TeleportPlayerTo(veh.Position); // Exception should be thrown here

TeBeCo•4/25/24, 6:04 PM

well yeah obviously

TeBeCo•4/25/24, 6:04 PM

i'm gonna ask a stupid question but can you explain what you think dispose does

TeBeCo•4/25/24, 6:05 PM

and in what state the object is after being disposed

TeBeCo•4/25/24, 6:05 PM

and given all that if you think that instance is still usable after being disposed

LDamiOP•4/25/24, 6:07 PM

I don't really know what is a disposed object, I understand I can use it to delete objects in the game. I haven't find a way to make a disposed object usable again, so I just recreate it again with the newnew statement

TeBeCo•4/25/24, 6:08 PM

yes you absolutely should never try to reused a disposed object

TeBeCo•4/25/24, 6:08 PM

that's your bug

TeBeCo•4/25/24, 6:08 PM

hence the name of the exception ObjectDisposedException

LDamiOP•4/25/24, 6:08 PM

Ok, I have understood that, and I think I have not make that in my code (or by mistake maybe)

TeBeCo•4/25/24, 6:09 PM

that's why i'm asking you to look in you code for .Dispose and using(){}

TeBeCo•4/25/24, 6:09 PM

because using(){} calls dispose

LDamiOP•4/25/24, 6:09 PM

But, what object is Disposed ? How can I see that ? the exception seems to be thrown at different moment

TTeBeCo because using(){} calls dispose

LDamiOP•4/25/24, 6:09 PM

Good to know !

LLDami But, what object is Disposed ? How can I see that ? the exception seems to be th...

TeBeCo•4/25/24, 6:10 PM

can't tell

✅ ObjectDisposedException without explicit trace

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