Question

WPF MVVM模式下 TreeView 怎么只展开一个节点.其余节点关闭

Answer 1

先定义了一个类 public class TreeViewIconsItem : TreeViewItem { ImageSource iconSource; TextBlock textBlock; Image icon; public TreeViewIconsItem() { StackPanel stack = new StackPanel(); //　 设置StackPanel中的内容水平排列 stack.Orientation = Orientation.Horizontal; Header = stack; icon = new Image(); icon.Source = iconSource; //　 向StackPanel对象中添加一个图标对象 stack.Children.Add(icon); //　 创建用于添加文本信息的TextBlock对象 textBlock = new TextBlock(); //　 向StackPanel对象中添加文本信息 stack.Children.Add(textBlock); } //　 用于设置或获得节点中的图标对象 public ImageSource Icon { set { iconSource = value; icon.Source = iconSource; icon.Width = 16; icon.Height = 16; } get { return iconSource; } } //　 用于设置或获得节点中的文本信息 public string HeaderText { set { textBlock.Text = value; } get { return textBlock.Text; } } }　加载数据时：TreeViewIconsItem tvii = new TreeViewIconsItem();tvii.HeaderText = s;TreeViewIconsItem tviiSub = new TreeViewIconsItem();tviiSub.HeaderText = friend[1];tvii.Items.Add(tviiSub);treeview1.Items.Add(tvii);