Question

我正在编写一个wp7应用程序，我对eventtrigger有一个问题。我有一个包含此ItemTemplate的列表框：

            <DataTemplate>
                <Grid Name="templatePanel"  Width="200" Height="200" Margin="10">
                    <Grid.Triggers>
                        <EventTrigger RoutedEvent="Grid.Tap" >
                            <EventTrigger.Actions>
                                <BeginStoryboard>
                                    <Storyboard>
                                        <DoubleAnimation Storyboard.TargetName="templatePanel"
                                 Storyboard.TargetProperty="Opacity"
                                 From="0"
                                 To="1"
                                 Duration="0:0:5"/>
                                    </Storyboard>
                                </BeginStoryboard>
                            </EventTrigger.Actions>
                        </EventTrigger>
                    </Grid.Triggers>
                <!--SOME KIND OF CONTENT-->
                </Grid>
            </DataTemplate>

当我运行我的应用时，它会因使用此StackTrace而出现未指定的错误而崩溃：

 at MS.Internal.XcpImports.CheckHResult(UInt32 hr)
   at MS.Internal.XcpImports.UIElement_Measure(UIElement element, Size availableSize)
   at System.Windows.UIElement.Measure(Size availableSize)
   at Microsoft.Phone.Controls.WrapPanel.MeasureOverride(Size constraint)
   at System.Windows.FrameworkElement.MeasureOverride(IntPtr nativeTarget, Double inWidth, Double inHeight, Double& outWidth, Double& outHeight)
   at MS.Internal.XcpImports.MeasureNative(IntPtr element, Single inWidth, Single inHeight)
   at MS.Internal.XcpImports.UIElement_Measure(UIElement element, Size availableSize)
   at System.Windows.UIElement.Measure(Size availableSize)
   at System.Windows.Controls.ScrollContentPresenter.MeasureOverride(Size constraint)
   at System.Windows.FrameworkElement.MeasureOverride(IntPtr nativeTarget, Double inWidth, Double inHeight, Double& outWidth, Double& outHeight)
   at MS.Internal.XcpImports.MeasureNative(IntPtr element, Single inWidth, Single inHeight)
   at MS.Internal.XcpImports.UIElement_Measure(UIElement element, Size availableSize)
   at System.Windows.UIElement.Measure(Size availableSize)
   at System.Windows.Controls.ScrollViewer.MeasureOverride(Size constraint)
   at System.Windows.FrameworkElement.MeasureOverride(IntPtr nativeTarget, Double inWidth, Double inHeight, Double& outWidth, Double& outHeight)
   at MS.Internal.XcpImports.MeasureOverrideNative(IntPtr element, Single inWidth, Single inHeight, Single& outWidth, Single& outHeight)
   at MS.Internal.XcpImports.FrameworkElement_MeasureOverride(FrameworkElement element, Size availableSize)
   at System.Windows.FrameworkElement.MeasureOverride(Size availableSize)
   at System.Windows.FrameworkElement.MeasureOverride(IntPtr nativeTarget, Double inWidth, Double inHeight, Double& outWidth, Double& outHeight)
   at MS.Internal.XcpImports.MeasureOverrideNative(IntPtr element, Single inWidth, Single inHeight, Single& outWidth, Single& outHeight)
   at MS.Internal.XcpImports.FrameworkElement_MeasureOverride(FrameworkElement element, Size availableSize)
   at System.Windows.FrameworkElement.MeasureOverride(Size availableSize)
   at System.Windows.FrameworkElement.MeasureOverride(IntPtr nativeTarget, Double inWidth, Double inHeight, Double& outWidth, Double& outHeight)
   at MS.Internal.XcpImports.MeasureOverrideNative(IntPtr element, Single inWidth, Single inHeight, Single& outWidth, Single& outHeight)
   at MS.Internal.XcpImports.FrameworkElement_MeasureOverride(FrameworkElement element, Size availableSize)
   at System.Windows.FrameworkElement.MeasureOverride(Size availableSize)
   at Microsoft.Phone.Controls.PhoneApplicationFrame.MeasureOverride(Size availableSize)
   at System.Windows.FrameworkElement.MeasureOverride(IntPtr nativeTarget, Double inWidth, Double inHeight, Double& outWidth, Double& outHeight)

但如果我设置

<EventTrigger RoutedEvent="Grid.Loaded" >

应用不崩溃！

为什么会这样？提前谢谢！

Answer 1

Silverlight仅支持Loaded（RoutedEvent）。引自MSDN：

在XAML中，您将其指定为字符串。在代码中，传递标识符（a RoutedEvent值。）Silverlight中唯一支持的值是加载/ FrameworkElement.LoadedEvent。

WP7应用程序在eventtrigger中崩溃并出现未指定的错误

1 个答案: