Service Reference client bug?

Question

Hi i have a WPF application that uses a service reference to a web service...

Now i have a GUI component that tracks the progress of this...

But i seem to have some sort of bug here, it only occurs on some machines and not often.. I start a call with MethodNameAsync and display the progress bar until the matching Completed event occurs.

some times i call 3 different async methods in a row but only the two of them get their Completed event raised so the GUI will be locked and the application has to be restarted.

After being totally frustrated a few weeks i found the event AppDomain.CurrentDomain.FirstChanceException, so i hooked up to it and started logging all FirstChanceExceptions..

Before the second event is raised a System.Net.Sockets.SocketException "An invalid argument was supplied" is thrown and after that a System.ObjectDisposedException "Cannot access a disposed object." is thrown both are first chance exceptions..

i guess my wcf client forgets about the third method call when this happens but my loading indicator does not..

So is this a known bug or am i missing some thing?

Edit code as requested:

mCheckInService = New CheckInServiceClient()
AddHandler mCheckInService.GetPersonActivitiesCompleted, AddressOf CheckInService_GetPersonActivitiesCompleted
AddHandler mCheckInService.GetPersonArticlesCompleted, AddressOf CheckInService_GetPersonArticlesCompleted
AddHandler mCheckInService.GetPersonImageCompleted, AddressOf CheckInService_GetPersonImageCompleted


Dim workItem As WorkItem = Context.WorkDisplayService.AddWorkItem(Me, Resources.Label.DownloadingPersomImage)
mCheckInService.GetPersonImageAsync(Context.Session, person, workItem)

workItem = Context.WorkDisplayService.AddWorkItem(Me, "Hämtar aktiviteter")
mCheckInService.GetPersonActivitiesAsync(Context.Session, Person, workItem)

workItem = Context.WorkDisplayService.AddWorkItem(Me, Resources.Label.DownloadingPersonArticles)
mCheckInService.GetPersonArticlesAsync(Context.Session, person, workItem)


Private Sub CheckInService_GetPersonActivitiesCompleted(ByVal sender As Object, ByVal e As GetPersonActivitiesCompletedEventArgs)
    Dim workItem As WorkItem = CType(e.UserState, WorkItem)
    If (Context.WorkDisplayService.FinishWorkItem(Me, workItem)) Then

Private Sub CheckInService_GetPersonArticlesCompleted(ByVal sender As Object, ByVal e As GetPersonArticlesCompletedEventArgs)
    Logger.Trace("CheckInService_GetPersonArticlesCompleted()")
    Dim workItem As WorkItem = CType(e.UserState, WorkItem)
    If (Context.WorkDisplayService.FinishWorkItem(Me, workItem)) Then

Private Sub CheckInService_GetPersonImageCompleted(ByVal sender As Object, ByVal e As GetPersonImageCompletedEventArgs)
    Logger.Trace("CheckInService_GetPersonImageCompleted()")
    Dim workItem As WorkItem = CType(e.UserState, WorkItem)
    If (Context.WorkDisplayService.FinishWorkItem(Me, workItem)) Then

Its GetPersonActivitiesAsync that never gets completed..

Edit:

Fix this temporary by not using async methods and instead using a thread that will call them one by one.. now this is not a elegant solution, i should be able to use the async methods...

show some codes plz, how do you crate Proxy, how do you call methods and etc. — Arsen Mkrtchyan, Aug 16 '11 at 11:55

score 1 · Answer 1 · answered Aug 16 '11 at 12:06

1

The clue here is "Cannot access a disposed object".

What sometimes happens with callback code is that the code that should be listening for the callback has been disposed, so when the callback comes back, nobody is listening.

answered Aug 16 '11 at 12:06

Shiraz Bhaiji

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ok, this sounds all good but i get no chase to react to this as its only thrown as a first chance exception and handled by the proxy?.. – Peter Aug 16 '11 at 12:55
System.ObjectDisposedException Cannot access a disposed object. Objektname: System.Net.Sockets.NetworkStream. vid System.Net.Sockets.NetworkStream.UnsafeBeginWrite(Byte[] buffer, Int32 offset, Int32 size, AsyncCallback callback, Object state) I have no access to the networkstream... – Peter Aug 16 '11 at 13:02

Service Reference client bug?

1 Answers1