如何从代码数据模板中访问控制的背后？

问题描述：

您好我有一个的MediaElement 在的DataTemplate ，但我无法从代码访问它的后面。

Hi I have a MediaElement within the DataTemplate but I am unable to access it from the code behind.

我张贴下面的XAML代码：

I am posting xaml code below:

<Grid>
<Grid.ColumnDefinitions>
    <ColumnDefinition Width="605*"/>
    <ColumnDefinition Width="151*"/>
</Grid.ColumnDefinitions>
<GroupBox Header="My Videos" Height="177" VerticalAlignment="Top" Margin="5,320,5,0" Grid.ColumnSpan="2">
    <ListBox x:Name="VideoList" ItemsSource="{Binding Videos }" Width="auto" Height=" auto" Margin="0,0,0,0" Grid.ColumnSpan="2" >
        <DataTemplate x:Name="DTVideos">
            <ListBoxItem Name="lbivid1" BorderThickness="2"  Width="240" Selected="lbivid_Selected" >
                <MediaElement Name="vidList" Height="150" Width="150" Source="{Binding SourceUri}" Position="00:00:05" LoadedBehavior="Pause" ScrubbingEnabled="True"/>
            </ListBoxItem>
        </DataTemplate>
        <ItemsControl.ItemsPanel>
            <ItemsPanelTemplate>
                <StackPanel Orientation="Horizontal" Margin="0,0,0,0"/>
            </ItemsPanelTemplate>
        </ItemsControl.ItemsPanel>
    </ListBox>
</GroupBox>     
<GroupBox Header="Preview" Height="320" Width="400" VerticalAlignment="Top" DockPanel.Dock="Left">
    <MediaElement x:Name="videoPreview" HorizontalAlignment="Left" Height="300" VerticalAlignment="Top" Width="388"/>
</GroupBox>

后面的代码：

 private void lbivid_Selected(object sender, RoutedEventArgs e)
 {   
    imagePreview.Visibility = Visibility.Hidden;   
    string urlStr = (VidList.Source).ToString();          
    Uri temp = new Uri(UrlStr);
    videoPreview.Source = temp;                         
 }

能否你们谁能告诉我怎样才能做到呢？

Can anyone of you please tell me how can it be done?

答

您应的能够使用访问您的控制 FrameworkTemplate.FindName 方法...首先，获得 ContentPresenter 从 ListBoxItem的取值之一：

You should be able to access your control using the FrameworkTemplate.FindName method... first, get the ContentPresenter from one of the ListBoxItems:

ContentPresenter contentPresenter = FindVisualChild<ContentPresenter>(yourListBoxItem);

然后获得的DataTemplate 从 ContentPresenter ：

DataTemplate yourDataTemplate = contentPresenter.ContentTemplate;

然后获得的MediaElement 从的DataTemplate ：

MediaElement yourMediaElement = yourDataTemplate.FindName("vidList", contentPresenter) 
as MediaElement;
if (yourMediaElement != null)
{
    // Do something with yourMediaElement here
}

请参见 FrameworkTemplate.FindName 方法在MSDN上获得更多信息。

Please see the FrameworkTemplate.FindName Method page on MSDN for more information.

如何从代码数据模板中访问控制的背后？

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