WPF: Cannot create an instance of all control in a user control

Question

I use custom control in my WPF application. This custom control includes logic and resource dictionary. In my application I have login window and main window. Application first loads login window

<Application x:Class="Dest.App"
             ....
             StartupUri="Login.xaml">
</Application>

Custom control I use in my main window

<time:Calendar CloseAppointment="OnDeleteAppointment" AddAppointment="OnAddAppointment" Appointments="{Binding Path=Model}" />

Also in MainWindow I load resource dictionary from assembly

<ResourceDictionary>
  <ResourceDictionary.MergedDictionaries>
    <ResourceDictionary Source="pack://application:,,,/WpfCalendar;component/Dictionary.xaml"/>
  </ResourceDictionary.MergedDictionaries>
</ResourceDictionary>

Visual Studio loads custom control without any exceptions. But when I load application and successfully login, viewmodel of the login view calls main windows

 MainWindow mainWindow = new MainWindow();
 mainWindow.Show();

Constructor of the main window

public MainWindow()
{
   InitializeComponent();    
   m_MainViewModel = new MainViewModel();
   this.DataContext = m_MainViewModel;
}

I receive an exception

Exception

Exception details

at WpfCalendar.Logic.Calendar.FilterAppointments() in D:\development\Dental Soft\LotusScheduler\WpfScheduler\WpfCalendar\Logic\Calendar.cs:line 122 at WpfCalendar.Logic.Calendar.OnAppointmentsChanged(DependencyPropertyChangedEventArgs e) in D:\development\Dental Soft\LotusScheduler\WpfScheduler\WpfCalendar\Logic\Calendar.cs:line 109 at WpfCalendar.Logic.Calendar.OnAppointmentsChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) in D:\development\Dental Soft\LotusScheduler\WpfScheduler\WpfCalendar\Logic\Calendar.cs:line 100 at System.Windows.DependencyObject.OnPropertyChanged(DependencyPropertyChangedEventArgs e) at System.Windows.FrameworkElement.OnPropertyChanged(DependencyPropertyChangedEventArgs e) at System.Windows.DependencyObject.NotifyPropertyChange(DependencyPropertyChangedEventArgs args) at System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType) at System.Windows.DependencyObject.InvalidateProperty(DependencyProperty dp, Boolean preserveCurrentValue) at System.Windows.Data.BindingExpressionBase.Invalidate(Boolean isASubPropertyChange) at System.Windows.Data.BindingExpression.TransferValue(Object newValue, Boolean isASubPropertyChange) at System.Windows.Data.BindingExpression.Activate(Object item) at System.Windows.Data.BindingExpression.AttachToContext(AttachAttempt attempt) at System.Windows.Data.BindingExpression.MS.Internal.Data.IDataBindEngineClient.AttachToContext(Boolean lastChance) at MS.Internal.Data.DataBindEngine.Task.Run(Boolean lastChance) at MS.Internal.Data.DataBindEngine.Run(Object arg) at MS.Internal.Data.DataBindEngine.OnLayoutUpdated(Object sender, EventArgs e) at System.Windows.ContextLayoutManager.fireLayoutUpdateEvent() at System.Windows.ContextLayoutManager.UpdateLayout() at System.Windows.ContextLayoutManager.UpdateLayoutCallback(Object arg) at System.Windows.Media.MediaContext.InvokeOnRenderCallback.DoWork() at System.Windows.Media.MediaContext.FireInvokeOnRenderCallbacks() at System.Windows.Media.MediaContext.RenderMessageHandlerCore(Object resizedCompositionTarget) at System.Windows.Media.MediaContext.RenderMessageHandler(Object resizedCompositionTarget) at System.Windows.Media.MediaContext.Resize(ICompositionTarget resizedCompositionTarget) at System.Windows.Interop.HwndTarget.OnResize() at System.Windows.Interop.HwndTarget.HandleMessage(WindowMessage msg, IntPtr wparam, IntPtr lparam) at System.Windows.Interop.HwndSource.HwndTargetFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled) at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled) at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o) 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) at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs) at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam) at MS.Win32.UnsafeNativeMethods.CallWindowProc(IntPtr wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam) at MS.Win32.HwndSubclass.DefWndProcWrapper(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam) at MS.Win32.UnsafeNativeMethods.CallWindowProc(IntPtr wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam) at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam) at MS.Win32.UnsafeNativeMethods.SetWindowPos(HandleRef hWnd, HandleRef hWndInsertAfter, Int32 x, Int32 y, Int32 cx, Int32 cy, Int32 flags) at System.Windows.Window.SetupInitialState(Double requestedTop, Double requestedLeft, Double requestedWidth, Double requestedHeight) at System.Windows.Window.CreateSourceWindow(Boolean duringShow) at System.Windows.Window.CreateSourceWindowDuringShow() at System.Windows.Window.SafeCreateWindowDuringShow() at System.Windows.Window.ShowHelper(Object booleanBox) at System.Windows.Window.Show() at ViewModel.LoginingViewModel.Login(Object parameter) in D:\development\Dental Soft\Lotus\AMS\Dentist\ViewModel\LoginingViewModel.cs:line 162 at ViewModel.LoginingViewModel.b__0(Object param) in D:\development\Dental Soft\Lotus\AMS\Dentist\ViewModel\LoginingViewModel.cs:line 115 at ViewModel.CommonCommand.Execute(Object parameter) in D:\development\Dental Soft\Lotus\AMS\Dentist\Commands\CommonCommand.cs:line 59 at MS.Internal.Commands.CommandHelpers.CriticalExecuteCommandSource(ICommandSource commandSource, Boolean userInitiated) 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.UIElement.OnMouseLeftButtonUpThunk(Object sender, MouseButtonEventArgs e) at System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget) at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target) at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs) at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised) at System.Windows.UIElement.ReRaiseEventAs(DependencyObject sender, RoutedEventArgs args, RoutedEvent newEvent) at System.Windows.UIElement.OnMouseUpThunk(Object sender, MouseButtonEventArgs e) at System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget) at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target) at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs) at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised) at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args) at System.Windows.UIElement.RaiseTrustedEvent(RoutedEventArgs args) at System.Windows.UIElement.RaiseEvent(RoutedEventArgs args, Boolean trusted) at System.Windows.Input.InputManager.ProcessStagingArea() at System.Windows.Input.InputManager.ProcessInput(InputEventArgs input) at System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport) at System.Windows.Interop.HwndMouseInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawMouseActions actions, Int32 x, Int32 y, Int32 wheel) at System.Windows.Interop.HwndMouseInputProvider.FilterMessage(IntPtr hwnd, WindowMessage msg, IntPtr wParam, IntPtr lParam, Boolean& handled) at System.Windows.Interop.HwndSource.InputFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled) at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled) at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o) 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) at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs) at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam) at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg) at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame) at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame) at System.Windows.Threading.Dispatcher.Run() at System.Windows.Application.RunDispatcher(Object ignore) at System.Windows.Application.RunInternal(Window window) at System.Windows.Application.Run(Window window) at System.Windows.Application.Run() at Dentist.App.Main() in D:\development\Dental Soft\Lotus\AMS\Dentist\obj\x86\Debug\App.g.cs:line 0 at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args) at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args) at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly() at System.Threading.ThreadHelper.ThreadStart_Context(Object state) at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Threading.ThreadHelper.ThreadStart()

Part of the resource dictionary with problem controls

<Border BorderBrush="#A5BFE1" BorderThickness="0,1,1,1" Background="White" Grid.Column="1" Grid.Row="0" >
    <TextBlock x:Name="DayHeader" HorizontalAlignment="Center" VerticalAlignment="Center">
    <TextBlock.ToolTip>
        <ToolTip>
            <StackPanel>
                <TextBlock FontWeight="Bold" Text="{x:Static Properties:Resources.CalendarSelectedDayTitle}" />
                <TextBlock Text="{x:Static Properties:Resources.CalendarSelectedDayDescription}" />
            </StackPanel>
        </ToolTip>
    </TextBlock.ToolTip>
        </TextBlock>
</Border>
<time:Scroll x:Name="scrollViewer" CustomVerticalOffset="640.0" Grid.Row="2" Grid.Column="0" Grid.ColumnSpan="2">
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="60" />
            <ColumnDefinition Width="*" />
        </Grid.ColumnDefinitions>

        <time:TimeRibbon Grid.Column="0"></time:TimeRibbon>
        <time:SchedulerDay Grid.Column="1" x:Name="Day"></time:SchedulerDay>
    </Grid>
</time:Scroll>

Constructor of the Calendar control (that throw exception)

public Calendar()
{
    DefaultStyleKeyProperty.OverrideMetadata(typeof(Calendar), new FrameworkPropertyMetadata(typeof(Calendar)));

    CommandManager.RegisterClassCommandBinding(typeof(Calendar), 
        new CommandBinding(NextDay, new ExecutedRoutedEventHandler(OnExecutedNextDay), 
            new CanExecuteRoutedEventHandler(OnCanExecuteNextDay)));

    CommandManager.RegisterClassCommandBinding(typeof(Calendar),
        new CommandBinding(PreviousDay, new ExecutedRoutedEventHandler(OnExecutedPreviousDay),
            new CanExecuteRoutedEventHandler(OnCanExecutePreviousDay)));
}

But when set in app.xaml the first window MainWindow, not LoginWindow everything works properly without any excetions!

Please advise what can be cause of the problem?

Thank you

You've got everything in here except the exact information we need to help you -- the exception details. Re-run, then click the link highlighted here i.stack.imgur.com/JDnyI.png then edit and add it to your question. — user1228
Exception details tell us 1) where the exception occurred 2) what inner exceptions there are. Without that, your question is pointless. You could throw 90% of this question away and supply the exception details and get an answer. — user1228

Federico Berasategui Federico Berasategui · Accepted Answer · 2012-10-31T20:32:46

The exception is ocurring (as per your screenshot) in your FilterAppointments class constructor. In which you're performing some actions based on your controltemplate, but the template is not yet assigned in that moment. You should override OnApplyTemplate() and move that code there instead.

WPF: Cannot create an instance of all control in a user control

1 Answers