WP7 - IsolatedStorage Errors

Question

I'm building a Windows Phone 7 application that uses isolated storage. The code works most of the time but I keep getting IsolatedStorageExceptions randomly:

{"An error occurred while accessing IsolatedStorage."}

There are no further details about the reason for the exception.  Here is the stack trace:

   at System.IO.IsolatedStorage.IsolatedStorageFile.DeleteFile(String file)
   at MyApp.Core.Data.WindowsPhoneFileRepository.DeleteFile(String name)
   at MyApp.Core.Domain.ThingService.SaveThing(Thing Thing)
   at MyApp.Core.Domain.TrackedThingService.PersistThingLocally(TrackedThing Thing)
   at MyApp.Ui.ViewModels.TrackViewModel.<.ctor>b__3(Thing Thing)
   at GalaSoft.MvvmLight.Command.RelayCommand`1.Execute(Object parameter)
   at GalaSoft.MvvmLight.Command.EventToCommand.Invoke(Object parameter)
   at System.Windows.Interactivity.TriggerAction.CallInvoke(Object parameter)
   at System.Windows.Interactivity.TriggerBase.InvokeActions(Object parameter)
   at System.Windows.Interactivity.EventTriggerBase.OnEvent(EventArgs eventArgs)
   at System.Windows.Interactivity.EventTriggerBase.OnEventImpl(Object sender, EventArgs eventArgs)
   at System.Windows.Controls.Primitives.ButtonBase.OnClick()
   at System.Windows.Controls.Button.OnClick()
   at System.Windows.Controls.Primitives.ButtonBase.OnMouseLeftButtonUp(MouseButtonEventArgs e)
   at System.Windows.Controls.Control.OnMouseLeftButtonUp(Control ctrl, EventArgs e)
   at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, String eventName)

The file exists. I place all my IsolatedStorage uses inside using blocks so I shouldn't have the file open anywhere.

What could be causing this?

How I can I get more details about the cause of the exception?

Answer 1

It should not be overlooked that the WP7 is still in Beta (you've updated from the CTP to the Beta version right?).

Consider creating a very simple application that manipulates the Isolated storage in the way your main application is to see if you can create a small Repo of the problem. Having done that send it to Microsoft so they can take a look at it.

Answer 2

I would specifically check to make sure that you've closed all readers and writers to anything within the File that you are trying to delete. I'm not saying that will definately fix it, but rather not being able to delete files that do exist tend to be caused by open files.