我怎样才能改变DataTemplate中的DayTitleTemplate在CalendarItemTemplate

当我试图更改默认的DataTemplate为DayTitleTemplate在日历，如果根元素不是文本块，应用程序崩溃。我怎样才能改变DataTemplate中的DayTitleTemplate在CalendarItemTemplate

有谁知道如何避免碰撞？

以下是用于演示目的的模板的简化版本。 （Kaxaml就绪）

<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"> 
<Grid> 
    <Calendar> 
     <Calendar.CalendarItemStyle> 
      <Style TargetType="CalendarItem"> 
       <Setter Property="Template"> 
        <Setter.Value> 
         <ControlTemplate TargetType="CalendarItem"> 
          <ControlTemplate.Resources> 
       <!-- ___________________________________________________________________ --> 
       <!-- This is the default Data template --> 
           <DataTemplate x:Key="{ComponentResourceKey ResourceId=DayTitleTemplate, TypeInTargetAssembly={x:Type CalendarItem}}"> 
            <TextBlock HorizontalAlignment="Center" Margin="0,6" VerticalAlignment="Center" FontFamily="Verdana" FontSize="9.5" FontWeight="Bold" Foreground="#FF333333" Text="{Binding}"/> 
           </DataTemplate> 
       <!-- ___________________________________________________________________ --> 
       <!-- This is a modified Data template, using this template instead of the Default, makes the XAML crash. --> 
       <!--<DataTemplate x:Key="{ComponentResourceKey ResourceId=DayTitleTemplate, TypeInTargetAssembly={x:Type CalendarItem}}"> 
        <Grid> 
         <Rectangle Stroke="Brown" StrokeThickness="0.5"/> 
         <TextBlock Foreground="#FF333333" FontWeight="Bold" FontSize="9.5" FontFamily="Verdana" HorizontalAlignment="Center" Text="{Binding}" VerticalAlignment="Center"/> 
        </Grid> 
       </DataTemplate>--> 
       <!-- ___________________________________________________________________ --> 
          </ControlTemplate.Resources> 
          <Grid x:Name="PART_Root"> 
           <Border Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" CornerRadius="1"> 
            <Border BorderBrush="White" BorderThickness="2" CornerRadius="1"> 
             <Grid> 
              <Grid.ColumnDefinitions> 
               <ColumnDefinition Width="Auto"/> 
               <ColumnDefinition Width="Auto"/> 
               <ColumnDefinition Width="Auto"/> 
              </Grid.ColumnDefinitions> 
              <Grid.RowDefinitions> 
               <RowDefinition Height="Auto"/> 
               <RowDefinition Height="*"/> 
              </Grid.RowDefinitions> 
              <Button x:Name="PART_PreviousButton" Width="28" Height="20" Grid.Column="0" Grid.Row="0" HorizontalAlignment="Left" Focusable="False"> 
              </Button> 
              <Button x:Name="PART_HeaderButton" Grid.Column="1" Grid.Row="0" HorizontalAlignment="Center" VerticalAlignment="Center" Focusable="False" FontSize="10.5" FontWeight="Bold"> 
              </Button> 
              <Button x:Name="PART_NextButton" Width="28" Height="20" Grid.Column="2" Grid.Row="0" HorizontalAlignment="Right" Focusable="False"> 
              </Button> 
              <Grid x:Name="PART_MonthView" Grid.ColumnSpan="3" Grid.Row="1" HorizontalAlignment="Center" Margin="6,-1,6,6" Visibility="Visible"> 
               <Grid.ColumnDefinitions> 
                <ColumnDefinition Width="Auto"/> 
                <ColumnDefinition Width="Auto"/> 
                <ColumnDefinition Width="Auto"/> 
                <ColumnDefinition Width="Auto"/> 
                <ColumnDefinition Width="Auto"/> 
                <ColumnDefinition Width="Auto"/> 
                <ColumnDefinition Width="Auto"/> 
               </Grid.ColumnDefinitions> 
               <Grid.RowDefinitions> 
                <RowDefinition Height="*"/> 
                <RowDefinition Height="*"/> 
                <RowDefinition Height="*"/> 
                <RowDefinition Height="*"/> 
                <RowDefinition Height="*"/> 
                <RowDefinition Height="*"/> 
                <RowDefinition Height="*"/> 
               </Grid.RowDefinitions> 
              </Grid> 
              <Grid x:Name="PART_YearView" Grid.ColumnSpan="3" Grid.Row="1" HorizontalAlignment="Center" Margin="6,-3,7,6" Visibility="Hidden"> 
               <Grid.ColumnDefinitions> 
                <ColumnDefinition Width="Auto"/> 
                <ColumnDefinition Width="Auto"/> 
                <ColumnDefinition Width="Auto"/> 
                <ColumnDefinition Width="Auto"/> 
               </Grid.ColumnDefinitions> 
               <Grid.RowDefinitions> 
                <RowDefinition Height="Auto"/> 
                <RowDefinition Height="Auto"/> 
                <RowDefinition Height="Auto"/> 
               </Grid.RowDefinitions> 
              </Grid> 
             </Grid> 
            </Border> 
           </Border> 
          </Grid> 
          <ControlTemplate.Triggers> 
           <DataTrigger Binding="{Binding DisplayMode, RelativeSource={RelativeSource FindAncestor, AncestorLevel=1, AncestorType={x:Type Calendar}}}" Value="Year"> 
            <Setter TargetName="PART_MonthView" Property="Visibility" Value="Hidden"/> 
            <Setter TargetName="PART_YearView" Property="Visibility" Value="Visible"/> 
           </DataTrigger> 
           <DataTrigger Binding="{Binding DisplayMode, RelativeSource={RelativeSource FindAncestor, AncestorLevel=1, AncestorType={x:Type Calendar}}}" Value="Decade"> 
            <Setter TargetName="PART_MonthView" Property="Visibility" Value="Hidden"/> 
            <Setter TargetName="PART_YearView" Property="Visibility" Value="Visible"/> 
           </DataTrigger> 
          </ControlTemplate.Triggers> 
         </ControlTemplate> 
        </Setter.Value> 
       </Setter> 
      </Style> 
     </Calendar.CalendarItemStyle> 
    </Calendar> 
</Grid> 
</Page>

这是堆栈跟踪我得到（对不起我的系统在日本，这是一个正常的NullReferenceException）。我只是将xaml粘贴到全新的WPF应用程序项目中。我不使用任何自动化或其他任何东西。

System.NullReferenceException はハンドルされませんでした。 
    Message=オブジェクト参照がオブジェクト インスタンスに設定されていません。 
    Source=PresentationCore 
    StackTrace: 
     場所 System.Windows.Automation.Peers.AutomationPeer.EnsureChildren() 
     場所 System.Windows.Automation.Peers.AutomationPeer.UpdateChildrenInternal(Int32 invalidateLimit) 
     場所 System.Windows.Automation.Peers.AutomationPeer.UpdateChildren() 
     場所 System.Windows.Automation.Peers.AutomationPeer.UpdateSubtree() 
     場所 System.Windows.Automation.Peers.AutomationPeer.UpdateSubtree() 
     場所 System.Windows.ContextLayoutManager.fireAutomationEvents() 
     場所 System.Windows.ContextLayoutManager.UpdateLayout() 
     場所 System.Windows.UIElement.UpdateLayout() 
     場所 System.Windows.Interop.HwndSource.Process_WM_SIZE(UIElement rootUIElement, IntPtr hwnd, WindowMessage msg, IntPtr wParam, IntPtr lParam) 
     場所 System.Windows.Interop.HwndSource.LayoutFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled) 
     場所 MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled) 
     場所 MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o) 
     場所 System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs) 
     場所 MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler) 
     場所 System.Windows.Threading.Dispatcher.InvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs) 
     場所 MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam) 
     場所 MS.Win32.UnsafeNativeMethods.ShowWindow(HandleRef hWnd, Int32 nCmdShow) 
     場所 System.Windows.Window.ShowHelper(Object booleanBox) 
     場所 System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs) 
     場所 MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler) 
     場所 System.Windows.Threading.DispatcherOperation.InvokeImpl() 
     場所 System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(Object state) 
     場所 System.Threading.ExecutionContext.runTryCode(Object userData) 
     場所 System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData) 
     場所 System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state) 
     場所 System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx) 
     場所 System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) 
     場所 System.Windows.Threading.DispatcherOperation.Invoke() 
     場所 System.Windows.Threading.Dispatcher.ProcessQueue() 
     場所 System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled) 
     場所 MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled) 
     場所 MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o) 
     場所 System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs) 
     場所 MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler) 
     場所 System.Windows.Threading.Dispatcher.InvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs) 
     場所 MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam) 
     場所 MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg) 
     場所 System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame) 
     場所 System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame) 
     場所 System.Windows.Threading.Dispatcher.Run() 
     場所 System.Windows.Application.RunDispatcher(Object ignore) 
     場所 System.Windows.Application.RunInternal(Window window) 
     場所 System.Windows.Application.Run(Window window) 
     場所 System.Windows.Application.Run() 
    InnerException:

来源

2011-05-11 Vicro

你的样品XAML（网格，棕色中风等）与VS2010 SP1 .NET4，86我的机器上不会崩溃。工作正常。 – 2011-05-11 03:39:04

你碰巧修复了上述异常吗？如果是这样，你可以发布解决方案吗？ – Luke 2011-06-17 00:21:23

我无法修复它，我不得不使用其他设计。 – Vicro 2011-06-17 02:38:48

我有一个类似的问题，以下文章帮助我：http://social.msdn.microsoft.com/Forums/ar/wpf/thread/0ee9954d-0df5-4d61-8dc9-eb50c7a5be99。

你的情况，你会改变：

x:Key="{ComponentResourceKey ResourceId=DayTitleTemplate, TypeInTargetAssembly={x:Type CalendarItem}}"

到

x:Key="{x:Static CalendarItem.DayTitleTemplateResourceKey}"

来源

2011-10-27 17:50:24 Friggers

不幸的是我不能再测试它了，我不再工作了，而且我的开发环境也不同。我看起来像是正确的答案，非常感谢。 – Vicro 2011-10-28 01:22:49

我怎样才能改变DataTemplate中的DayTitleTemplate在CalendarItemTemplate

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