潜移默化学会WPF（技巧篇）--具有Items元素的控件子项获取（一）

1. treeview的Item获取

var g = this.tree.ItemContainerGenerator;

TreeViewItem item = g.ContainerFromItem(this.tree.SelectedItem) as TreeViewItem;
if (item != null) item.IsExpanded = true;

2.ListBox

var g = listbox实例.ItemContainerGenerator;

ListBoxItem item = g.ContainerFromIndex(listbox实例.SelectedIndex) as ListBoxItem

3.Combobox

(comboBox1.ItemContainerGenerator.ContainerFromIndex(comboBox1.SelectedIndex) as ComboBoxItem).Content.ToString()