Question

我在另一个应用程序中使用了media元素来播放具有相同实现的视频，并且它按预期工作但每当我将控件放入我的Avalon dock数据模板时，我收到此错误消息“名称'VideoControl'不存在于VideoControl.Play()上的当前上下文，即使在同一个应用程序中，我将控件置于Avalon停靠栏标签之外，按预期工作。

<DockPanel Name="df"  Grid.Row="2" FlowDirection="LeftToRight" LastChildFill="True"  SnapsToDevicePixels="True" WindowChrome.ResizeGripDirection="TopLeft">
    <avalonDock:DockingManager x:Name="dockManager" AnchorablesSource="{Binding Tools}" DocumentsSource="{Binding Files}" ActiveContent="{Binding ActiveDocument, Mode=TwoWay, Converter={StaticResource ActiveDocumentConverter}}" DockPanel.Dock="Left" Grid.Row="2" BorderBrush="Black" BorderThickness="1">
        <avalonDock:DockingManager.LayoutItemTemplateSelector>
            <localController:PanesTemplateSelector>
                <localController:PanesTemplateSelector.PreviewViewTemplate>
                    <DataTemplate>
                        <StackPanel>
                            <MediaElement Canvas.Left="20" Canvas.Top ="40" x:Name= "VideoControl" LoadedBehavior="Manual" UnloadedBehavior="Stop" ></MediaElement>
                            <Button Height="23" HorizontalAlignment="Left" Margin="15,0,0,13" Name="PlayButton" VerticalAlignment="Bottom" Width="75" Click="PlayClick">Play</Button>
                            <Button Height="23" HorizontalAlignment="Left" Margin="103,0,0,13" Name="PauseButton" VerticalAlignment="Bottom" Width="75" Click="PauseClick">Pause</Button>
                            <Button Height="23" Margin="191,0,186,13" Name="StopButton" VerticalAlignment="Bottom"  Click="StopClick">Stop</Button>
                        </StackPanel>
                    </DataTemplate>
                </localController:PanesTemplateSelector.PreviewViewTemplate>
            </localController:PanesTemplateSelector>
        </avalonDock:DockingManager.LayoutItemTemplateSelector>
    </avalonDock:DockingManager>
</DockPanel>

C＃Class：

public class PanesTemplateSelector : DataTemplateSelector
{
    public DataTemplate PreviewViewTemplate
    {
        get;
        set;
    }
    #endregion
    #region Template Selection
    public override System.Windows.DataTemplate SelectTemplate(object item, System.Windows.DependencyObject container)
    {
        //Creates a new collection of layout content
        var itemAsLayoutContent = item as LayoutContent;

        if (item is PreviewViewModel)
            return PreviewViewTemplate;

        //Returns selected template
        return base.SelectTemplate(item, container);
    }
    #endregion
}

Answer 1

这不是预期的行为吗？按名称访问datatemplate中的控件很棘手。使用

or

检索您的控件

如何访问avalon dock数据模板中的名称标签

1 个答案: