Question

My WPF test app (very simple, just one window) is using a 3rd party managed dll (say X.dll). This managed dll uses some unmanaged dll’s .
So lets say I write a small wpf app which just references X.dll. And in the window’s constructor I access something inside X.dll (ie. in some namespace in X.dll). On doing this i dont catch any exception and it seems like things are going on as expected. But upon returning the control to .NET runtime, I get an exception in Application class’s ‘DispatcherUnhandledException’ handler :

“Overflow or underflow in the arithmetic operation.”
System.ArithmeticException was unhandled
Message=”Overflow or underflow in the arithmetic operation.”
Source=”PresentationFramework”
StackTrace:

System.Windows.Window.ValidateTopLeft(Double length)
System.Windows.Window.CoerceTop(DependencyObject d, Object value)
System.Windows.DependencyObject.ProcessCoerceValue(DependencyProperty dp, PropertyMetadata metadata, EntryIndex& entryIndex, Int32& targetIndex, EffectiveValueEntry& newEntry, EffectiveValueEntry& oldEntry, Object& oldValue, Object baseValue, CoerceValueCallback coerceValueCallback, Boolean coerceWithDeferredReference, Boolean skipBaseValueChecks)
System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, OperationType operationType)
System.Windows.DependencyObject.CoerceValue(DependencyProperty dp) at System.Windows.Window.SetupInitialState(Double requestedTop, Double requestedLeft, Double requestedWidth, Double requestedHeight)
System.Windows.Window.CreateSourceWindowImpl() at System.Windows.Window.SafeCreateWindow() at System.Windows.Window.ShowHelper(Object booleanBox)
System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Boolean isSingleParameter)
System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler)

Some points:

• This only occurs in WPF app and not in winforms app.
• This does not get caught in a try-catch. only in Application’s DispatcherUnhandledException
• This does not happen if I access X.dll’s code inside the Window’s ‘Loaded’ event, only happens in constructor.

Can anyone guess the problem ?

Thanks,
Mishal

Answer 1

I am not sure of the root cause yet but the solution is here :
http://social.msdn.microsoft.com/forums/en-US/wpf/thread/a31f9c7a-0e15-4a09-a544-bec07f0f152c

Seems to be a popular bug 🙂