I have an application that displays a few datagrids in the tabitems of a TabControl. On one of the machines on which it's deployed - and only one - switching tabs crashes the application without any warning. I have no way to debug the app on that machine. The only indication I have on the crash comes from the event viewer. Here's the exception stack trace:
Framework Version: v4.0.30319 Description: The process was terminated due to an unhandled exception. Exception Info: System.NullReferenceException Stack: at System.Windows.Controls.Primitives.DataGridColumnHeader.SetLeftGripperVisibility() at System.Windows.Controls.Primitives.DataGridColumnHeader.HookupGripperEvents() at System.Windows.FrameworkElement.ApplyTemplate() at System.Windows.FrameworkElement.MeasureCore(System.Windows.Size) at System.Windows.UIElement.Measure(System.Windows.Size) at System.Windows.Controls.DataGridCellsPanel.MeasureChild(System.Windows.UIElement, System.Windows.Size) at System.Windows.Controls.DataGridCellsPanel.GenerateChild(System.Windows.Controls.Primitives.IItemContainerGenerator, System.Windows.Size, System.Windows.Controls.DataGridColumn, Int32 ByRef, System.Windows.Size ByRef) at System.Windows.Controls.DataGridCellsPanel.GenerateChild(System.Windows.Controls.Primitives.IItemContainerGenerator, System.Windows.Size, System.Windows.Controls.DataGridColumn, System.IDisposable ByRef, Int32 ByRef, System.Windows.Size ByRef)
at System.Windows.Controls.DataGridCellsPanel.DetermineRealizedColumnsBlockList(System.Windows.Size) at System.Windows.Controls.DataGridCellsPanel.MeasureOverride(System.Windows.Size) at System.Windows.FrameworkElement.MeasureCore(System.Windows.Size)
at System.Windows.UIElement.Measure(System.Windows.Size) at System.Windows.ContextLayoutManager.UpdateLayout() at System.Windows.ContextLayoutManager.UpdateLayoutCallback(System.Object) at System.Windows.Media.MediaContext.FireInvokeOnRenderCallbacks()
at System.Windows.Media.MediaContext.RenderMessageHandlerCore(System.Object) at System.Windows.Media.MediaContext.RenderMessageHandler(System.Object) at System.Windows.Threading.ExceptionWrapper.InternalRealCall(System.Delegate, System.Object, Int32) at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(System.Object, System.Delegate, System.Object, Int32, System.Delegate) at System.Windows.Threading.Dispatcher.WrappedInvoke(System.Delegate, System.Object, Int32, System.Delegate) at System.Windows.Threading.DispatcherOperation.InvokeImpl() at System.Threading.ExecutionContext.runTryCode(System.Object) at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode, CleanupCode, System.Object) at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean) at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object) at System.Windows.Threading.DispatcherOperation.Invoke() at System.Windows.Threading.Dispatcher.ProcessQueue() at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr, Int32, IntPtr, IntPtr, Boolean ByRef) at MS.Win32.HwndWrapper.WndProc(IntPtr, Int32, IntPtr, IntPtr, Boolean ByRef) at MS.Win32.HwndSubclass.DispatcherCallbackOperation(System.Object) at System.Windows.Threading.ExceptionWrapper.InternalRealCall(System.Delegate, System.Object, Int32) at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(System.Object, System.Delegate, System.Object, Int32, System.Delegate) at System.Windows.Threading.Dispatcher.WrappedInvoke(System.Delegate, System.Object, Int32, System.Delegate) at System.Windows.Threading.Dispatcher.InvokeImpl(System.Windows.Threading.DispatcherPriority, System.TimeSpan, System.Delegate, System.Object, Int32) at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr, Int32, IntPtr, IntPtr)
at MS.Win32.UnsafeNativeMethods.DispatchMessage(System.Windows.Interop.MSG ByRef) at System.Windows.Threading.Dispatcher.PushFrameImpl(System.Windows.Threading.DispatcherFrame) at System.Windows.Application.RunInternal(System.Windows.Window) at System.Windows.Application.Run() at MyApp.App.Main()
It all happens in external code. I tries to inherit from DataGrid, override the ApplyTemplate method and putting a try catch in it. But it seems this is not allowed and the resulting control is unusable. Any suggestions on how to fix this? Thank you
