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一、目的：在绑定TreeView的功能中经常会遇到需要在树节点前增加勾选CheckBox框，勾选本节点的同时也要同步显示父节点和子节点状态
二、实现
三、环境
VS2022
四、示例
定义如下节点类
public partial class TreeNodeBase<T> : SelectBindable<T>, ITreeNode{public TreeNodeBase(T t) : base(t){}private bool? _isChecked = false;public bool? IsChecked{get { return _isChecked; }set{_isChecked = value;RaisePropertyChanged();RefreshParentCheckState();RefreshChildrenCheckState();}}private void RefreshParentCheckState(){if (Parent == null)return;bool allChecked = Parent.Nodes.All(l => l.IsChecked == true);if (allChecked){Parent.CheckOnlyCurrent(true);Parent.RefreshParentCheckState();return;}bool allUnChecked = Parent.Nodes.All(l => l.IsChecked == false);if (allUnChecked){Parent.CheckOnlyCurrent(false);Parent.RefreshParentCheckState();return;}Parent.CheckOnlyCurrent(null);Parent.RefreshParentCheckState();}private void RefreshChildrenCheckState(){foreach (TreeNodeBase<T> item in Nodes){item.CheckOnlyCurrent(IsChecked);item.RefreshChildrenCheckState();}}private void CheckOnlyCurrent(bool? value){_isChecked = value;RaisePropertyChanged("IsChecked");}public TreeNodeBase<T> Parent { get; set; }private ObservableCollection<TreeNodeBase<T>> _nodes = new ObservableCollection<TreeNodeBase<T>>();public ObservableCollection<TreeNodeBase<T>> Nodes{get { return _nodes; }set{_nodes = value;RaisePropertyChanged();}}public void AddNode(TreeNodeBase<T> node){node.Parent = this;Nodes.Add(node);}}其中核心方法是如下方法
分别在当前节点勾选有变化时去更新父节点和子节点的勾选状态
五、需要了解的知识点
TreeView 类 (System.Windows.Controls) | Microsoft Learn
六、源码地址
GitHub - HeBianGu/WPF-ControlDemo: 示例
GitHub - HeBianGu/WPF-ControlBase: Wpf封装的自定义控件资源库
GitHub - HeBianGu/WPF-Control: WPF轻量控件和皮肤库
七、了解更多
System.Windows.Controls 命名空间 | Microsoft Learn
https://github.com/HeBianGu
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