WPF的Treeview控件实现CheckBox

WPF的Treeview控件的一般用法书上都有介绍，就没必要多讲。这里主要说明TreeView里实现CheckBox。
首先构造一个Node类

    public class Node : INotifyPropertyChanged    {        public event PropertyChangedEventHandler PropertyChanged;        private void NotifyPropertyChanged(String info)        {            if (PropertyChanged != null)            {                PropertyChanged(this, new PropertyChangedEventArgs(info));            }        }        public Node()        {            this.IsSelected = false;            this.Nodes = new List<Node>();        }        /// <summary>        ///  节点名称        /// </summary>        public string NodeName { get; set; }                /// <summary>        /// 被删除        /// </summary>        private bool isSelected = false;        public bool IsSelected        {            set            {                this.isSelected = value;                this.NotifyPropertyChanged("IsSelected");            }            get { return this.isSelected; }        }        /// <summary>        /// 子节点集合        /// </summary>        public List<Node> Nodes { get; set; }    }    public enum NodeType    {        RootNode,//根节点        LeafNode,//叶子节点    }

接着来看一下后台数据，这里需要让TreeView的节点自动展开，并实现父节点被选，子节点全被选，父节点不选，子节点全部不选的功能（这里应该有更好的办法，我这里是用父节点的名称来判断的，对于指定的TreeView数据还好说）。

public partial class MainWindow : Window    {        public List<Node> nodeList { get; set; }        public MainWindow()        {            InitializeComponent();                    }        private List<Node> GetNodeList()        {            Node leafOneNode = new Node();            leafOneNode.NodeName = "叶子节点一";                        leafOneNode.Nodes = new List<Node>();            Node leafTwoNode = new Node();            leafTwoNode.NodeName = "叶子节点二";                        leafTwoNode.Nodes = new List<Node>();            Node leafThreeNode = new Node();            leafThreeNode.NodeName = "叶子节点三";                        leafThreeNode.Nodes = new List<Node>();            Node leafOneNode1 = new Node();            leafOneNode1.NodeName = "叶子节点1";                        leafOneNode1.Nodes = new List<Node>();            Node leafTwoNode2 = new Node();            leafTwoNode2.NodeName = "叶子节点2";                        leafTwoNode2.Nodes = new List<Node>();            Node leafThreeNode3 = new Node();            leafThreeNode3.NodeName = "叶子节点3";                        leafThreeNode3.Nodes = new List<Node>();            return new List<Node>()            {                new Node(){NodeName="根节点",Nodes=new List<Node>(){leafOneNode, leafTwoNode, leafThreeNode}},                new Node(){NodeName="根节点1",Nodes=new List<Node>(){leafOneNode1, leafTwoNode2, leafThreeNode3}}            };        }        private void ExpandTree()        {            if (this.TreeView_NodeList.Items != null && this.TreeView_NodeList.Items.Count > 0)            {                foreach (var item in this.TreeView_NodeList.Items)                {                    DependencyObject dependencyObject = this.TreeView_NodeList.ItemContainerGenerator.ContainerFromItem(item);                    if (dependencyObject != null)//第一次打开程序，dependencyObject为null，会出错                    {                        ((TreeViewItem)dependencyObject).ExpandSubtree();                    }                }            }        }        private void Window_Loaded(object sender, RoutedEventArgs e)        {            nodeList = GetNodeList();            this.TreeView_NodeList.ItemsSource = nodeList;            ExpandTree();        }        private void CheckBox_Checked(object sender, RoutedEventArgs e)        {              if((sender as CheckBox).Content.ToString()== "根节点")            {                foreach(Node item in nodeList[0].Nodes)                {                    item.IsSelected = true;                }            }            if ((sender as CheckBox).Content.ToString() == "根节点1")            {                foreach (Node item in nodeList[1].Nodes)                {                    item.IsSelected = true;                }            }        }        private void CheckBox_Unchecked(object sender, RoutedEventArgs e)        {            if ((sender as CheckBox).Content.ToString() == "根节点")            {                foreach (Node item in nodeList[0].Nodes)                {                    item.IsSelected = false;                }            }            if ((sender as CheckBox).Content.ToString() == "根节点1")            {                foreach (Node item in nodeList[1].Nodes)                {                    item.IsSelected = false;                }            }        }    }

前台的xaml代码：

<Grid>        <TreeView Name="TreeView_NodeList">            <TreeView.Resources>                <HierarchicalDataTemplate  DataType="{x:Type local:Node}" ItemsSource="{Binding Nodes,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}">                    <StackPanel Orientation="Horizontal" Margin="0,2,0,2">                        <CheckBox Content="{Binding NodeName,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" ToolTip="{Binding NodeName,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" IsChecked="{Binding IsSelected,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" Checked="CheckBox_Checked" Unchecked="CheckBox_Unchecked" ></CheckBox>                    </StackPanel>                </HierarchicalDataTemplate>            </TreeView.Resources>        </TreeView>    </Grid>

或许这里可以用Style来做，暂时解决问题先就这样，因为代码也不长。