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ArgumentNullException when displaying WPF window

Posted By:      Posted Date: September 08, 2010    Points: 0   Category :WPF
We have recently upgrade our code base from .net 3.5 to .net 4.0. On one particular machine we are able to semi-reliably get the following exception in our application: System.ArgumentNullException: Value cannot be null. Parameter name: d    at MS.Internal.Data.ElementObjectRef.GetObject(DependencyObject d, ObjectRefArgs args)    at MS.Internal.Data.ObjectRef.GetDataObject(DependencyObject d, ObjectRefArgs args)    at System.Windows.Data.BindingExpression.MS.Internal.Data.IDataBindEngineClient.VerifySourceReference(Boolean lastChance)    at MS.Internal.Data.DataBindEngine.Task.Run(Boolean lastChance)    at MS.Internal.Data.DataBindEngine.Run(Object arg)    at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)    at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler) Basically we have a WPF window, with a particular view model as the DataContext. That view model has an observable collection which is then displayed using an ItemsControl. The code below is vastly simplified, for obvious reasons, but I'll try to describe it as clearly as possible. class MyOuterViewModel { public ObservableCollection<InnerViewModel> InnerItems { get; private set ; } pri

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