Dear Friends,
I have a windows forms application. I hosted the the "RadTreeView" inside a windows form using an "ElementHost" control. if I click on the treeview item I got an "NullReferenceException" in the "RadTreeView_GotFocus" method. By checking the source code of the method we found the problem.
The "Application.Current" is always null for a WinForms Applicaiton. So an exception throws on the first line of the code. Since It is unhandled It crashed the application.
Is there any workaround or solution to the above problem? I have attched the exception call stack too.
RadTreeView_GotFocus Method Source
-----
private void RadTreeView_GotFocus(object sender, RoutedEventArgs e)
{
if (Application.Current.MainWindow != null)
{
Application.Current.MainWindow.MouseWheel += new MouseWheelEventHandler(this.OnRootVisualMouseWheel);
}
if (e.OriginalSource == this)
{
if (this.SelectedContainer != null)
{
this.SelectedContainer.Focus();
}
else
{
RadTreeViewItem item = base.ItemContainerGenerator.ContainerFromIndex(0) as RadTreeViewItem;
if (item != null)
{
item.Focus();
}
}
}
this.IsSelectionActive = true;
}
Steps To reproduce
1. Create a WinForms Application (Target Framework to .NET 3.5)
1a. Add a reference to these dlls (Telerik.Windows.Controls & Telerik.Windows.Controls.Navigation)
2. Add a WPF UserControl to the project. And add the following XAML.
<telerik:RadTreeView >
<telerik:RadTreeViewItem Header="Sony" >
<telerik:RadTreeViewItem Header="Vaio" />
<telerik:RadTreeViewItem Header="Bravia" />
</telerik:RadTreeViewItem>
</telerik:RadTreeView>
3. Add a "ElementHost" control to the exisiting "Form1 (Windows Form)".
4. Build the project
5. Set the child property of the ElementHost to an instance of the WPF UserControl we created.
6. Build and Run the application.
7. Click over a treeviewitem.
8. The application will crash.
Runtime Details
Windows Vista 32 bit Business Edition
VS.NET 2008 Professional With SP1
.NET Framework 3.5 SP1
Telereik Version : 2009.1.424.35 (both Telerik.Windows.Controls & Telerik.Windows.Controls.Navigation)
The exception call stack.
Telerik.Windows.Controls.Navigation.dll!Telerik.Windows.Controls.RadTreeView.RadTreeView_GotFocus(object sender = {Telerik.Windows.Controls.RadTreeView Items.Count:1}, System.Windows.RoutedEventArgs e = {System.Windows.RoutedEventArgs}) + 0x2a bytes
PresentationCore.dll!System.Windows.RoutedEventHandlerInfo.InvokeHandler(object target, System.Windows.RoutedEventArgs routedEventArgs) + 0x78 bytes
PresentationCore.dll!System.Windows.EventRoute.InvokeHandlersImpl(object source = {Sony}, System.Windows.RoutedEventArgs args = {System.Windows.RoutedEventArgs}, bool reRaised = false) + 0x1bf bytes
PresentationCore.dll!System.Windows.UIElement.RaiseEventImpl(System.Windows.DependencyObject sender = {Sony}, System.Windows.RoutedEventArgs args = {System.Windows.RoutedEventArgs}) + 0x79 bytes
PresentationCore.dll!System.Windows.UIElement.RaiseEvent(System.Windows.RoutedEventArgs e) + 0x17 bytes
PresentationCore.dll!System.Windows.UIElement.OnGotFocus(System.Windows.RoutedEventArgs e) + 0x5 bytes
PresentationFramework.dll!System.Windows.FrameworkElement.OnGotFocus(System.Windows.RoutedEventArgs e) + 0x4c bytes
PresentationCore.dll!System.Windows.UIElement.IsFocused_Changed(System.Windows.DependencyObject d, System.Windows.DependencyPropertyChangedEventArgs e) + 0xa2 bytes
WindowsBase.dll!System.Windows.DependencyObject.OnPropertyChanged(System.Windows.DependencyPropertyChangedEventArgs e) + 0x4a bytes
PresentationFramework.dll!System.Windows.FrameworkElement.OnPropertyChanged(System.Windows.DependencyPropertyChangedEventArgs e) + 0x50 bytes
WindowsBase.dll!System.Windows.DependencyObject.NotifyPropertyChange(System.Windows.DependencyPropertyChangedEventArgs args) + 0x2c bytes
WindowsBase.dll!System.Windows.DependencyObject.UpdateEffectiveValue(System.Windows.EntryIndex entryIndex = {System.Windows.EntryIndex}, System.Windows.DependencyProperty dp = {IsFocused}, System.Windows.PropertyMetadata metadata, System.Windows.EffectiveValueEntry oldEntry, ref System.Windows.EffectiveValueEntry newEntry = {System.Windows.EffectiveValueEntry}, bool coerceWithDeferredReference, System.Windows.OperationType operationType) + 0x515 bytes
WindowsBase.dll!System.Windows.DependencyObject.SetValueCommon(System.Windows.DependencyProperty dp, object value, System.Windows.PropertyMetadata metadata, bool coerceWithDeferredReference, System.Windows.OperationType operationType, bool isInternal) + 0x1eb bytes
WindowsBase.dll!System.Windows.DependencyObject.SetValue(System.Windows.DependencyPropertyKey key, object value) + 0x39 bytes
PresentationCore.dll!System.Windows.Input.FocusManager.OnFocusedElementChanged(System.Windows.DependencyObject d, System.Windows.DependencyPropertyChangedEventArgs e) + 0xf0 bytes
WindowsBase.dll!System.Windows.DependencyObject.OnPropertyChanged(System.Windows.DependencyPropertyChangedEventArgs e) + 0x4a bytes
PresentationFramework.dll!System.Windows.FrameworkElement.OnPropertyChanged(System.Windows.DependencyPropertyChangedEventArgs e) + 0x50 bytes
WindowsBase.dll!System.Windows.DependencyObject.NotifyPropertyChange(System.Windows.DependencyPropertyChangedEventArgs args) + 0x2c bytes
WindowsBase.dll!System.Windows.DependencyObject.UpdateEffectiveValue(System.Windows.EntryIndex entryIndex = {System.Windows.EntryIndex}, System.Windows.DependencyProperty dp = {FocusedElement}, System.Windows.PropertyMetadata metadata, System.Windows.EffectiveValueEntry oldEntry, ref System.Windows.EffectiveValueEntry newEntry = {System.Windows.EffectiveValueEntry}, bool coerceWithDeferredReference, System.Windows.OperationType operationType) + 0x515 bytes
WindowsBase.dll!System.Windows.DependencyObject.SetValueCommon(System.Windows.DependencyProperty dp, object value, System.Windows.PropertyMetadata metadata, bool coerceWithDeferredReference, System.Windows.OperationType operationType, bool isInternal) + 0x1eb bytes
WindowsBase.dll!System.Windows.DependencyObject.SetValue(System.Windows.DependencyProperty dp, object value) + 0x2e bytes
PresentationCore.dll!System.Windows.Input.FocusManager.SetFocusedElement(System.Windows.DependencyObject element, System.Windows.IInputElement value) + 0x2f bytes
PresentationFramework.dll!System.Windows.Input.KeyboardNavigation.UpdateFocusedElement(System.Windows.DependencyObject focusTarget = {Sony}) + 0x32 bytes
PresentationFramework.dll!System.Windows.FrameworkElement.OnGotKeyboardFocus(object sender, System.Windows.Input.KeyboardFocusChangedEventArgs e = {System.Windows.Input.KeyboardFocusChangedEventArgs}) + 0x47 bytes
PresentationCore.dll!System.Windows.Input.KeyboardFocusChangedEventArgs.InvokeEventHandler(System.Delegate genericHandler, object genericTarget) + 0x34 bytes
PresentationCore.dll!System.Windows.RoutedEventArgs.InvokeHandler(System.Delegate handler, object target) + 0x27 bytes
PresentationCore.dll!System.Windows.RoutedEventHandlerInfo.InvokeHandler(object target, System.Windows.RoutedEventArgs routedEventArgs) + 0x3e bytes
PresentationCore.dll!System.Windows.EventRoute.InvokeHandlersImpl(object source = {Sony}, System.Windows.RoutedEventArgs args = {System.Windows.Input.KeyboardFocusChangedEventArgs}, bool reRaised = false) + 0x1bf bytes
PresentationCore.dll!System.Windows.UIElement.RaiseEventImpl(System.Windows.DependencyObject sender = {Sony}, System.Windows.RoutedEventArgs args = {System.Windows.Input.KeyboardFocusChangedEventArgs}) + 0x79 bytes
PresentationCore.dll!System.Windows.UIElement.RaiseEvent(System.Windows.RoutedEventArgs args = {System.Windows.Input.KeyboardFocusChangedEventArgs}, bool trusted) + 0x35 bytes
PresentationCore.dll!System.Windows.Input.InputManager.ProcessStagingArea() + 0x311 bytes
PresentationCore.dll!System.Windows.Input.InputManager.ProcessInput(System.Windows.Input.InputEventArgs input) + 0x42 bytes
PresentationCore.dll!System.Windows.Input.KeyboardDevice.ChangeFocus(System.Windows.DependencyObject focus, int timestamp) + 0x63e bytes
PresentationCore.dll!System.Windows.Input.KeyboardDevice.TryChangeFocus(System.Windows.DependencyObject newFocus, System.Windows.Input.IKeyboardInputProvider keyboardInputProvider, bool askOld, bool askNew, bool forceToNullIfFailed) + 0x12b bytes
PresentationCore.dll!System.Windows.Input.KeyboardDevice.Focus(System.Windows.DependencyObject focus, bool askOld, bool askNew) + 0xc2 bytes
PresentationCore.dll!System.Windows.Input.KeyboardDevice.Focus(System.Windows.IInputElement element) + 0x1a bytes
PresentationCore.dll!System.Windows.UIElement.Focus() + 0x1a bytes
Telerik.Windows.Controls.Navigation.dll!Telerik.Windows.Controls.RadTreeViewItem.OnHeaderMouseLeftButtonDown(object sender = {System.Windows.Controls.Grid}, System.Windows.Input.MouseButtonEventArgs e = {System.Windows.Input.MouseButtonEventArgs}) + 0x7f bytes
PresentationCore.dll!System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(System.Delegate genericHandler, object genericTarget) + 0x31 bytes
PresentationCore.dll!System.Windows.RoutedEventArgs.InvokeHandler(System.Delegate handler, object target) + 0x27 bytes
PresentationCore.dll!System.Windows.RoutedEventHandlerInfo.InvokeHandler(object target, System.Windows.RoutedEventArgs routedEventArgs) + 0x3e bytes
PresentationCore.dll!System.Windows.EventRoute.InvokeHandlersImpl(object source = {System.Windows.Controls.Grid}, System.Windows.RoutedEventArgs args = {System.Windows.Input.MouseButtonEventArgs}, bool reRaised = true) + 0x1bf bytes
PresentationCore.dll!System.Windows.UIElement.ReRaiseEventAs(System.Windows.DependencyObject sender = {System.Windows.Controls.Grid}, System.Windows.RoutedEventArgs args = {System.Windows.Input.MouseButtonEventArgs}, System.Windows.RoutedEvent newEvent) + 0x10a bytes
PresentationCore.dll!System.Windows.UIElement.CrackMouseButtonEventAndReRaiseEvent(System.Windows.DependencyObject sender, System.Windows.Input.MouseButtonEventArgs e) + 0x2e bytes
PresentationCore.dll!System.Windows.UIElement.OnMouseDownThunk(object sender, System.Windows.Input.MouseButtonEventArgs e) + 0xde bytes
PresentationCore.dll!System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(System.Delegate genericHandler, object genericTarget) + 0x31 bytes
PresentationCore.dll!System.Windows.RoutedEventArgs.InvokeHandler(System.Delegate handler, object target) + 0x27 bytes
PresentationCore.dll!System.Windows.RoutedEventHandlerInfo.InvokeHandler(object target, System.Windows.RoutedEventArgs routedEventArgs) + 0x3e bytes
PresentationCore.dll!System.Windows.EventRoute.InvokeHandlersImpl(object source = {System.Windows.Controls.TextBlock}, System.Windows.RoutedEventArgs args = {System.Windows.Input.MouseButtonEventArgs}, bool reRaised = false) + 0x1bf bytes
PresentationCore.dll!System.Windows.UIElement.RaiseEventImpl(System.Windows.DependencyObject sender = {System.Windows.Controls.TextBlock}, System.Windows.RoutedEventArgs args = {System.Windows.Input.MouseButtonEventArgs}) + 0x79 bytes
PresentationCore.dll!System.Windows.UIElement.RaiseEvent(System.Windows.RoutedEventArgs args = {System.Windows.Input.MouseButtonEventArgs}, bool trusted) + 0x35 bytes
PresentationCore.dll!System.Windows.Input.InputManager.ProcessStagingArea() + 0x311 bytes
PresentationCore.dll!System.Windows.Input.InputManager.ProcessInput(System.Windows.Input.InputEventArgs input) + 0x42 bytes
PresentationCore.dll!System.Windows.Input.InputProviderSite.ReportInput(System.Windows.Input.InputReport inputReport) + 0x62 bytes
PresentationCore.dll!System.Windows.Interop.HwndMouseInputProvider.ReportInput(System.IntPtr hwnd, System.Windows.Input.InputMode mode, int timestamp, System.Windows.Input.RawMouseActions actions, int x, int y, int wheel) + 0x2e2 bytes
PresentationCore.dll!System.Windows.Interop.HwndMouseInputProvider.FilterMessage(System.IntPtr hwnd = 591552, int msg = 513, System.IntPtr wParam = 1, System.IntPtr lParam = 589869, ref bool handled = false) + 0x4e1 bytes
PresentationCore.dll!System.Windows.Interop.HwndSource.InputFilterMessage(System.IntPtr hwnd = 591552, int msg = 513, System.IntPtr wParam = 1, System.IntPtr lParam = 589869, ref bool handled = false) + 0x75 bytes
WindowsBase.dll!MS.Win32.HwndWrapper.WndProc(System.IntPtr hwnd = 591552, int msg = 513, System.IntPtr wParam = 1, System.IntPtr lParam = 589869, ref bool handled = false) + 0xbe bytes
WindowsBase.dll!MS.Win32.HwndSubclass.DispatcherCallbackOperation(object o) + 0x7a bytes
WindowsBase.dll!System.Windows.Threading.ExceptionWrapper.InternalRealCall(System.Delegate callback = {Method = {System.Object DispatcherCallbackOperation(System.Object)}}, object args = {MS.Win32.HwndSubclass.DispatcherOperationCallbackParameter}, bool isSingleParameter = true) + 0x8a bytes
WindowsBase.dll!System.Windows.Threading.ExceptionWrapper.TryCatchWhen(object source = {System.Windows.Threading.Dispatcher}, System.Delegate callback, object args, bool isSingleParameter, System.Delegate catchHandler = null) + 0x4a bytes
WindowsBase.dll!System.Windows.Threading.Dispatcher.WrappedInvoke(System.Delegate callback, object args, bool isSingleParameter, System.Delegate catchHandler) + 0x44 bytes
WindowsBase.dll!System.Windows.Threading.Dispatcher.InvokeImpl(System.Windows.Threading.DispatcherPriority priority, System.TimeSpan timeout, System.Delegate method, object args, bool isSingleParameter) + 0x91 bytes
WindowsBase.dll!System.Windows.Threading.Dispatcher.Invoke(System.Windows.Threading.DispatcherPriority priority, System.Delegate method, object arg) + 0x40 bytes
WindowsBase.dll!MS.Win32.HwndSubclass.SubclassWndProc(System.IntPtr hwnd = 591552, int msg = 513, System.IntPtr wParam = 1, System.IntPtr lParam = 589869) + 0xdc bytes
[Native to Managed Transition]
[Managed to Native Transition]
> System.Windows.Forms.dll!System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(int dwComponentID, int reason = -1, int pvLoopData = 0) Line 2106 + 0x8 bytes C#
System.Windows.Forms.dll!System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(int reason = -1, System.Windows.Forms.ApplicationContext context = {System.Windows.Forms.ApplicationContext}) Line 3377 + 0x1b bytes C#
System.Windows.Forms.dll!System.Windows.Forms.Application.ThreadContext.RunMessageLoop(int reason, System.Windows.Forms.ApplicationContext context) Line 3261 + 0xa bytes C#
System.Windows.Forms.dll!System.Windows.Forms.Application.Run(System.Windows.Forms.Form mainForm) Line 1466 C#
WinAppCS.exe!WinAppCS.Program.Main() Line 18 + 0x1d bytes C#
[Native to Managed Transition]
[Managed to Native Transition]
mscorlib.dll!System.AppDomain.ExecuteAssembly(string assemblyFile, System.Security.Policy.Evidence assemblySecurity, string[] args) Line 931 + 0x1f bytes C#
Microsoft.VisualStudio.HostingProcess.Utilities.dll!Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly() + 0x2b bytes
mscorlib.dll!System.Threading.ThreadHelper.ThreadStart_Context(object state) Line 61 + 0xffffffe3 bytes C#
mscorlib.dll!System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state) Line 355 + 0xd bytes C#
mscorlib.dll!System.Threading.ThreadHelper.ThreadStart() Line 88 + 0xffffffe4 bytes C#
3 Answers, 1 is accepted
Rank 1
System.Windows.
Application app = new System.Windows.Application();
I am not sure whether it was the corret way of to solve the problem :(
We are aware of this issue. The problem is already fixed and the change will be reflected in the next Q2 release which is scheduled for the beginning of July.
As a workaround for now creating an instance of System.Windows.Application() is the way you can prevent this exception happens.
Kind regards,
Boryana
the Telerik team
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Rank 1
-
prakash