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Cannot access a disposed object

Cannot access a disposed object

Like rkimble has said, you don’t need to call dispose after close. Just call close.

as i know, ya you are right that close already doing the job of dispose but this dispose job doesn’t clear actually the memory, rite?

so is needed to call dispose() to clear all the memory.

i doing this because i need to make sure that all unnecessaries memory to be clear.

so i not very sure that if i didn’t displose after close will cause any issue to my program.

Thanks Matt.

The form’s close event automatically calls dispose.

From MSDN: «When a form is closed, all resources created in the form are closed, and the form is disposed.»

The only time I can think of, when you would call dispose, is if you initialize a form, it was never used, and you have code in the Closed event, and you don’t want it to fire. Then you would call dispose, but you would not call close.

the close already doing the job of dispose but this dispose job doesn’t clear actually the memory, rite?

No. Calling Close will always clear the memory. No need to call dispose.

What you mean that i should never to catch an exception for disposed form?

I mean that closing a form should never throw the exception. Something is wrong. Closing a form, or disposing a form should never cause an exception. Why put code in a try block if it will never throw an exception? There is some overhead involved with using a try block.

I think that the exception you are getting is that somewhere in your code, you are calling dispose, and then calling close.

You can’t call close on a disposed form.

Do a search for «Name_Of_Form.Dispose», and comment out all the lines, and see if it fixes the problem.

Edit: Did you step thru the program, like rkimble said? that’s the best way to find out where the problem is occuring. Problem might also be that form needs to be initialized again, because it was already closed, as someone has pointed out.

Create the object when any event fires like this.

Private Sub btnPrint_Click( ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnPrint.Click

Dim frmViewReportForm As New frmViewReport

yes, i already tried to comment out all the lines that related with dispose method. But as you mention calling Close() already will do the dispose, so the error still occur.

and in other test case i found that maybe is because i already closing the child form in parent form, so when program back to the child form then due to the object already dispose so the error occur. is it will happen? but as i mention that this situation didn’t occur any error in vs2003 but just in vs2005.

so. i also don know how to fix this.

«because i already closing the child form in parent form»

If you closed the child form from the parent form, then the form can’t be used again. It must be re-initialized before you use it again.

, so when program back to the child form then due to the object already dispose so the error occur.

If you know where the exception is being thrown, find the code where the program «goes back to the child form». Place this before that code, using the names of your Form and Form variable:

If NameOfChild.IsDisposed Then

NameOfChild = New ChildForm1

‘ ^^^ Place before the code that causes ObjectDisposedException.

If you don’t know where the exception is happening—have you made a break point, and stepped through the project yet? It is easy to do, and can show where the exception is being thrown. To make a break point, locate a line of code to make a break point on, click on the margin on left side of the line of code, and a red dot will appear, indicating a breakpoint. You should put the breakpoint at the beginning of the method that you think is causing the exception. Then run the project, and the project will pause on the break point, and highlight it with a yellow background. The break point pauses the code at that point. When paused, you can press F11, to «Walk» or «step» through the code, one line at a time. Keep pressing the F11 key, until you locate where the exception is happening.

I am not really sure if this will help you or not. To get better help, please post the code that is causing the exception.

PC System.ObjectDisposedException: Cannot Access a disposed object

Phaeton

Terrarian

Is anyone getting this error today? I ran Terraria yesterday without issue, and not I’m getting this error. The title of this thread is actually a very short version of the error I’m getting. If I start Terraria 6 or 7 times, it finally starts.

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Kazzymodus

Moderator

I don’t think this is a global issue, I suspect it applies to your system specifically.

Could you post the entire error, please?

Grumpy Squid

Duke Fishron

Could you delete your config.json located in DocumentsMy GamesTerraria?

This will reset your settings to default. Then see if you can launch Terraria.

Phaeton

Terrarian

I don’t think this is a global issue, I suspect it applies to your system specifically.

Could you post the entire error, please?

You’re probably right. Now that I think about it, I hadn’t played Terraria since the latest Windows update, which was a few days ago. I researched this error, and someone else had this problem after a Windows update. I don’t know if the two are related, but I figured I would mention it, regardless.

Deleting the Config.json file had no affect on this error.

Here’s a screenshot of the error —

Phaeton

Terrarian

It’s not an issue with the stock Terraria. It has to do with the tModLoader version.

I should have specified that in the original post, so my apologies for not doing that. If you’d like to delete this post, feel free to do so.

Grumpy Squid

Duke Fishron

So vanilla Terraria functions correctly, but your TModLoader version does not, is this correct? You may want to try reinstalling TModLoader. We’ll get this moved to Mod Discussion so the folks there can help. If you end up not getting a reply when it’s moved consider making a post in the TModLoader thread about your issue.

I’ll part with explaining the error or at the very least how I understand this error. The are times when an XNA application must unload assets either by design or because it lost access to the display device was lost (Alt-Tabbing from fullscreen for instance unloads the assets). Which is normally fine, since the assets can be recreated when it has access to your display device again. If for some reason though, the application can not get access to the display device when it’s time to recreate and render the assets it will throw this exception.

Some common causes for Vanilla Terraria to throw this error is when Windows creates a «ghost» monitor and the application attempts to partially render on the non-existant monitor. Other times it can be a Video Driver issue.

Here’s a thread where I helped another user with this error in vanilla. Unfortunately for him he ended up having to reinstall Windows to fix the issue.

If it turns out it isn’t exclusive to the modded Terraria and you get the issue in vanilla let us know and we’ll move it back here and continue troubleshooting.

Sysprogs

Sysprogs forums › Forums › VisualGDB › «System.ObjectDisposedException: Cannot access a disposed object.»

This topic contains 2 replies, has 2 voices, and was last updated by support 1 year, 9 months ago.

I’m facing this error when creating a simple Linux project (Gnu Make, all default options) in VisualStudio 2017:

The project ends up being created but not the vgdbsettings files, so it’s a standard C++ project.

Full error text

VisualGDB version: 5.3.18.1973
—————— System.ObjectDisposedException ——————
System.ObjectDisposedException: Cannot access a disposed object.
Object name: ‘Microsoft.VisualStudio.Project.VisualC.VCProjectEngine.VCConfigurationShim’.
at Microsoft.Verify.NotDisposed(Boolean condition, Object disposedValue, String message)
at Microsoft.VisualStudio.Project.VisualC.VCProjectEngine.VCConfigurationShim. d__316.MoveNext()
— End of stack trace from previous location where exception was thrown —
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.VisualStudio.Project.VisualC.VCProjectEngine.VCConfigurationShim. d__281.MoveNext()
— End of stack trace from previous location where exception was thrown —
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.VisualStudio.Project.VisualC.VCProjectEngine.VCConfigurationShim. b__56_0>d.MoveNext()
— End of stack trace from previous location where exception was thrown —
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.VisualStudio.Project.VisualC.VCProjectEngine.ApartmentMarshaler.<>c__DisplayClass9_0 1. b__0>d.MoveNext()
— End of stack trace from previous location where exception was thrown —
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.VisualStudio.Threading.JoinableTask.CompleteOnCurrentThread()
at Microsoft.VisualStudio.Threading.JoinableTask 1.CompleteOnCurrentThread()
at Microsoft.VisualStudio.Threading.JoinableTaskFactory.Run[T](Func 1 asyncMethod, JoinableTaskCreationOptions creationOptions)
at Microsoft.VisualStudio.Project.VisualC.VCProjectEngine.ApartmentMarshaler.Invoke[TResult](Func 1 method)
at Microsoft.VisualStudio.Project.VisualC.VCProjectEngine.VCConfigurationShim.get_ConfigurationType()
at mw.get_Configurations()
at w9.h(qp1 f, IProjectEditContext a, z b, String d, String c, vq1 e)
at g8.f(LinuxWizardState e, qp1 a, String c, String b, hj1 d)
at g8.DoRunWizardOrThrowException(hj1 c, String a, String b)
at yv1`1.Execute(Object c, Int32 e, Object[]& a, Object[]& b, wizardResult& d)

Visual studio info

Microsoft Visual Studio Professional 2017
Version 15.7.4
VisualStudio.15.Release/15.7.4+27703.2035
Microsoft .NET Framework
Version 4.7.03056

Installed Version: Professional

Visual C++ 2017 00369-60000-00001-AA116
Microsoft Visual C++ 2017

ASP.NET and Web Tools 2017 15.0.40601.0
ASP.NET and Web Tools 2017

C# Tools 2.8.3-beta6-62923-07. Commit Hash: 7aafab561e449da50712e16c9e81742b8e7a2969
C# components used in the IDE. Depending on your project type and settings, a different version of the compiler may be used.

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Common Azure Tools 1.10
Provides common services for use by Azure Mobile Services and Microsoft Azure Tools.

Debugging Tools for Windows 10.0.17110.1002
Integrates the Windows Debugger functionality (http://go.microsoft.com/fwlink/?linkid=223405) in Visual Studio.

JavaScript Language Service 2.0
JavaScript Language Service

Microsoft JVM Debugger 1.0
Provides support for connecting the Visual Studio debugger to JDWP compatible Java Virtual Machines

Microsoft MI-Based Debugger 1.0
Provides support for connecting Visual Studio to MI compatible debuggers

Microsoft Visual C++ Wizards 1.0
Microsoft Visual C++ Wizards

Microsoft Visual Studio VC Package 1.0
Microsoft Visual Studio VC Package

NuGet Package Manager 4.6.0
NuGet Package Manager in Visual Studio. For more information about NuGet, visit http://docs.nuget.org/.

ProjectServicesPackage Extension 1.0
ProjectServicesPackage Visual Studio Extension Detailed Info

ResourcePackage Extension 1.0
ResourcePackage Visual Studio Extension Detailed Info

Test Adapter for Boost.Test 1.0
Enables Visual Studio’s testing tools with unit tests written for Boost.Test. The use terms and Third Party Notices are available in the extension installation directory.

Test Adapter for Google Test 1.0
Enables Visual Studio’s testing tools with unit tests written for Google Test. The use terms and Third Party Notices are available in the extension installation directory.

TSVN 1.9
Control TortoiseSVN from within Visual Studio

Visual Basic Tools 2.8.3-beta6-62923-07. Commit Hash: 7aafab561e449da50712e16c9e81742b8e7a2969
Visual Basic components used in the IDE. Depending on your project type and settings, a different version of the compiler may be used.

Visual Studio Code Debug Adapter Host Package 1.0
Interop layer for hosting Visual Studio Code debug adapters in Visual Studio

Visual Studio Tools for CMake 1.0
Visual Studio Tools for CMake

VisualGDB 5.3
Allows developing and debugging Embedded, Linux, Android and other GCC/GDB-based applications with Visual Studio.

Windows Driver Kit 10.0.17110.1002
Headers, libraries, and tools needed to develop, debug, and test Windows drivers (msdn.microsoft.com/en-us/windows/hardware/gg487428.aspx)

Windows Machine Learning Generator Extension 1.0
Windows Machine Learning Visual Studio Extension Detailed Info

I was having the problem when adding a new project to an existing solution.

It worked when I created the same project in a blank environment. I then copy-pasted the .vgdbsettings files.

Thanks for the very detailed description. It looks like an internal exception in the Visual Studio Automation logic used by VisualGDB to create some project types. It used to get triggered a lot in early preview builds of VS2017, but was fixed after we filed a bug report with Microsoft. This might be another instance of it, or a completely different bug.

Не удается получить доступ к удаленному объекту — как исправить?

В проекте VB.NET WinForms я получаю исключение

Невозможно получить доступ к удаленному объекту

при закрытии формы. Это происходит очень редко, и я не могу воссоздать его по требованию. Трассировка стека выглядит следующим образом:

DbiSchedule — это управление расписанием от Dbi-tech. В форме есть таймер, который обновляет расписание на экране каждые несколько минут.

Любые идеи, что вызывает исключение и как я мог бы исправить это? или даже просто восстановить его по требованию?

Хей! Спасибо за ответы на все вопросы. Мы останавливаем Timer для события FormClosing и проверяем свойство IsDisposed в компоненте расписания, прежде чем использовать его в событии Timer Tick, но это не помогает.

Это действительно раздражающая проблема, потому что, если кто-то придумал решение, которое сработало, я бы не смог подтвердить решение, потому что я не могу воссоздать проблему вручную.

Попробуйте проверить свойство IsDisposed до доступа к элементу управления. Вы также можете проверить его на событии FormClosing, если вы используете событие FormClosed.

Мы останавливаем таймер на FormClosing, и мы проверяем Свойство IsDisposed в расписании компонента перед его использованием в таймере Tick, но это не помогает.

Вызов GC.Collect перед проверкой IsDisposed может помочь, но будьте осторожны с этим. Прочитайте эту статью Рико Мариани » Когда вызывать GC.Collect()».

Это похоже на проблему с потоками.
Гипотеза: Возможно, у вас есть основной поток и поток таймера, обращающиеся к этому элементу управления. Основной поток завершает работу, вызывая Control.Dispose(), чтобы указать, что я закончил с этим элементом управления, и больше не буду вызывать этого. Однако поток таймера все еще активен — переключение контекста на этот поток, где он может вызывать методы в том же элементе управления. Теперь контроль говорит, что я Уничтожен (уже отказался от моих ресурсов), и я больше не буду работать. Исключение ObjectDisposed.

Как решить эту проблему: перед тем, как вызывать методы/свойства элемента управления, выполните проверку с помощью

ИЛИ остановите поток таймера ДО утилизации объекта.

мы проверяем свойство IsDisposed на компонент расписания перед его использованием в событии Timer Tick, но это не помощь.

Если я понимаю, что трассировка стека, это не ваш таймер, который является проблемой, он один в самом элементе управления — это могут быть те, кто не очищается должным образом.

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Вы явно вызываете Dispose на свой контроль?

Остановка таймера не означает, что он не будет вызываться снова, в зависимости от того, когда вы остановите таймер, timer_tick все еще может быть поставлен в очередь в контуре сообщения для формы. Что произойдет, так это то, что вы получите еще один тик, которого вы, возможно, не ожидаете. Что вы можете сделать, так это в вашем timer_tick, перед запуском метода Timer_Tick проверьте свойство Enabled вашего таймера.

У меня была та же проблема, и я решил ее с помощью логического флага, который устанавливается при закрытии формы (System.Timers.Timer не имеет свойства IsDisposed). Везде на форме я запускал таймер, он проверял этот флаг. Если он был установлен, то не запускайте таймер. Вот причина:

Причина:

Я останавливался и избавлялся от таймера в закрытии формы. Я запускал таймер в событии Timer_Elapsed(). Если бы я должен был закрыть форму в середине события Timer_Elapsed(), таймер был бы немедленно уничтожен событием Form_Closing(). Это произойдет до того, как событие Timer_Elapsed() завершится, и, что более важно, до того, как оно попадет в следующую строку кода:

Как только эта строка будет выполнена, ObjectDisposedException() будет выдан с упомянутой вами ошибкой.

Решение:

Здесь таймер истекшего события:

Интересно знать, что даже при попытке запуска таймера выдается исключение ObjectDisposedException, таймер все равно запускается, вызывая его запуск даже при закрытии формы (поток останавливается только при закрытии приложения).

Emby Community

Cannot access a disposed object. Object na.

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#1Drazgo 11 Jul 2016

Running into an issue since latest two updates (may or not be related).

All of my shows are showing offline.

This is the error: Cannot access a disposed object. Object name: ‘SqliteItemRepository has been disposed and cannot be accessed.’.

I’ve googled but haven’t found a fix.

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#2Luke 11 Jul 2016

Hi there, welcome. Please provide an Emby Server log file. Please see:

for instructions. Thanks!

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#3Drazgo 12 Jul 2016

Here is the server log, let me know if you need any additional logs.

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#4Luke 12 Jul 2016

This log looks normal and contains no errors.

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#5Drazgo 12 Jul 2016

Upgraded to .63, offline message appears to be gone but the library scan is no longer moving. Please see attached logs.

I am also unable to play anything and images do not appear to be working either. I have checked the paths to everything and I can access.

Edited by Drazgo, 12 July 2016 — 11:57 PM.

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#6Happy2Play 13 Jul 2016

From another post on the exception you are receiving.

Here is the error:

Every once in a while Windows will take several minutes to release the port bindings after you shutdown Emby Server. You can run into this error if you are frantically restarting Emby Server over and over, which I’m guessing you were based on your other topic. Just wait 5 minutes and it usually clears itself up and goes away. Or reboot your computer.

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#7Drazgo 13 Jul 2016

I believe that error was a result of the update.

After the update, I clicked the restart button from the browser menu.. it took about a minute then came back with the unhandled exception error. This happened a once or twice more before coming up and displaying the current behavior.

I’ve done reboots of my nas, computer, and emby in various orders and I am still getting the same behavior unfortunately. Library scan won’t move past less than a quarter of the bar, images are not displaying for anything other than recently watched, and playback doesn’t appear to work either.

I’ve let the library scan sit all day with no result. So something isn’t communicating properly with emby it looks like.

Just now, while jumping around the menu, it wouldn’t refresh the browser. I closed that browser and opened a new one and it now is at 45% clean database.

Googling on that it looks like others have experienced a loss of images and thumbnails. should I clear cache?

Edited by Drazgo, 13 July 2016 — 08:33 AM.

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#8Drazgo 23 Jul 2016

So I was unable to resolve so I did a partial uninstall, which seemed to just wipe out everything anyway

It wiped my profiles and database, so basically its a brand new install. full scan and rebuild of db, had to create new profile, etc.

So far no issues. Thanks all to were looking into the issue. I will return if it occurs again hopefully with logs that have useful info.

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