如何从代码隐藏访问数据模板中的控件
本文关键字:控件 数据 访问 代码 隐藏 | 更新日期: 2023-09-27 18:35:37
我在DataTemplate
中有一个MediaElement
,但我无法从后面的代码访问它。
我在下面发布 XAML 代码:
<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>
</Grid>
代码隐藏:
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;
}
你们谁能告诉我怎么做?
您应该能够使用 FrameworkTemplate.FindName
方法访问您的控件...首先,从ListBoxItem
之一获取ContentPresenter
:
ContentPresenter contentPresenter = FindVisualChild<ContentPresenter>(yourListBoxItem);
然后从ContentPresenter
获取DataTemplate
:
DataTemplate yourDataTemplate = contentPresenter.ContentTemplate;
然后从DataTemplate
获取MediaElement
:
MediaElement yourMediaElement = yourDataTemplate.FindName("vidList", contentPresenter)
as MediaElement;
if (yourMediaElement != null)
{
// Do something with yourMediaElement here
}
有关详细信息,请参阅 MSDN 上的FrameworkTemplate.FindName
方法页。
事件处理程序中有发件人,它是ListBoxItem,MediaElement是ListBoxItem.Content
var mediaElement = ((ListBoxItem)sender).Content as MediaElement;
if (mediaElement != null) ...