WPF ListBox 获取listBoxItem

1.已知item的DataContext,获取ListBoxItem

1）ItemContainerGenerator.ContainerFromItem

var selectedItem = DocumentsControl.ItemContainerGenerator.ContainerFromItem(object itemModel)

注：如果开户了VirtualizingPanel.IsVirtualizing="True"，不在当前显示范围内的Item是获取不了的。

2）ItemContainerGenerator.ContainerFromItem

var selectedItem = DocumentsControl.ItemContainerGenerator.ContainerFromIndex(int index)

3.模板中的控件获取ListBoxItem

var item = DocumentsControl.ContainerFromElement(element) as ListBoxItem;

4.也可以用VisualHelper获取