Question

WPF中如何使用代码操作数据模板生成的控件

Answer 1

有一个Listbox，里面的Item是通过数据模板生成的，如下所示：<BorderMargin="15"BorderBrush="Aqua"BorderThickness="2"Padding="8"CornerRadius="5"<StackPanel<ListBoxName="myListBox" ItemTemplate ="{StaticResourcemyDataTemplate}" IsSynchronizedWithCurrentItem="True"<ListBox.ItemsSource<BindingSource="{StaticResourceInventoryData}"XPath="Books/Book"/</ListBox.ItemsSource</ListBox<ButtonMargin="10"Click="DataTemplateFindElement" GettextoftextBlockinDataTemplate</Button</StackPanel</Border Listbox使用的数据模板如下：<DataTemplatex:Key="myDataTemplate"<TextBlockName="textBlock"FontSize="14"<TextBlock.Text<BindingXPath="Title"/</TextBlock.Text</TextBlock</DataTemplate 使用下面的代码就可以获取数据模板里面TextBlock中的内容了。 ListBoxItemmyListBoxItem=(ListBoxItem)(myListBox.ItemContainerGenerator.ContainerFromItem(myListBox.Items.CurrentItem)); ContentPresentermyContentPresenter=FindVisualChild<ContentPresenter (myListBoxItem); DataTemplatemyDataTemplate=myContentPresenter.ContentTemplate; TextBlockmyTextBlock=(TextBlock)myDataTemplate.FindName("textBlock" ,myContentPresenter); MessageBox.Show("ThetextofthenamedTextBlockintheDataTemplateoftheselectedlistitem:"+myTextBlock.Text); 上面代码调用的函数如下：privatechildItemFindVisualChild<childItem

Answer 2

函数如下：

private childItem FindVisualChild<childItem>(DependencyObject obj) where childItem : DependencyObject
{
for (int i = 0; i < VisualTreeHelper.GetChildrenCount(obj); i++)
{
DependencyObject child = VisualTreeHelper.GetChild(obj, i);
if (child != null && child is childItem)
return (childItem)child;
else
{
childItem childOfChild = FindVisualChild<childItem>(child);
if (childOfChild != null)
return childOfChild;
}
}
return null;
}