Lấy UIElement trong 1 DataTemplate

1 . Code XAML :

<ListBox Name="ListBox_Test" Height="200">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Name="StackPanel_Template">
<TextBlock Text="{Binding Path = Name}"/>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>

2 . Code C# để lấy TextBlock

ListBoxItem item = (ListBoxItem )ListBox_Test.ItemContainerGenerator.ContainerFromIndex(ListBox_Test.SelectedIndex);
if (item == null)
return;
DataTemplate data = item.ContentTemplate;

UIElement content = VisualTreeHelper.GetChild(item, 0) as UIElement;
ContentPresenter presenter = (ContentPresenter)(VisualTreeHelper.GetChild(content, 0));

if (presenter == null)
return;
StackPanel obj = data.FindName("StackPanel_Template", presenter) as StackPanel;

Tham khảo : từ anh Khánhtl - FalconSoftware