winform treeview checkbox----递归算法利用

在平常开发中，treeview的节点显示checkbox，若节点存在几级时，往往希望，选中父节点后，其子节点都要选中，如何实现勒，请看

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;



namespace SmartHome

{

    public partial class TreeViewAndCheckbox : Form

    {

        public TreeViewAndCheckbox()

        {

            InitializeComponent();

            //treeview显示checkbox

            treeView1.CheckBoxes = true;

            TreeViewUtil.ShowTreeViewInfo(treeView1);

            this.treeView1.AfterCheck += new TreeViewEventHandler(treeView1_AfterCheck);



        }





        private void TreeViewAndCheckbox_Load(object sender, EventArgs e)

        {

            treeView1.ExpandAll();

        }



        private void treeView1_AfterCheck(object sender, TreeViewEventArgs e)

        {



            if (e.Action == TreeViewAction.ByMouse)

            {

                textBox1.Text = e.Node.Text;

                if (e.Node.Checked)

                {

                    //取消节点选中状态之后，取消所有父节点的选中状态

                    setChildNodeCheckedState(e.Node, true);



                }

                else

                {

                    //取消节点选中状态之后，取消所有父节点的选中状态

                    setChildNodeCheckedState(e.Node, false);

                    //如果节点存在父节点，取消父节点的选中状态

                    if (e.Node.Parent != null)

                    {

                        setParentNodeCheckedState(e.Node, false);

                    }

                }

            }

        }

        //取消节点选中状态之后，取消所有父节点的选中状态

        private void setParentNodeCheckedState(TreeNode currNode, bool state)

        {

            TreeNode parentNode = currNode.Parent;



            parentNode.Checked = state;

            if (currNode.Parent.Parent != null)

            {

                setParentNodeCheckedState(currNode.Parent, state);

            }

        }

        //选中节点之后，选中节点的所有子节点

        private void setChildNodeCheckedState(TreeNode currNode, bool state)

        {

            TreeNodeCollection nodes = currNode.Nodes;

            if (nodes.Count > 0)

                foreach (TreeNode tn in nodes)

                {



                    tn.Checked = state;

                    setChildNodeCheckedState(tn, state);

                }

        }



        private void button1_Click(object sender, EventArgs e)

        {

            int i = 0;

            foreach (TreeNode tn in treeView1.Nodes)

            {

                if (tn.Checked)

                    i++;

                foreach (TreeNode item in tn.Nodes)

                {

                    if (item.Checked)

                    {

                        i++;

                    }

                    foreach (TreeNode nd in item.Nodes)

                    {

                        if (nd.Checked)

                        {

                            i++;

                        }



                    }



                }

                textBox2.Text = i.ToString();



            }



        }



        /// <summary>

        /// 查询treeNode节点下有多少节点被选中（递归实现，不受级数限制）

        /// </summary>

        /// <param name="tv"></param>

        /// <returns></returns>

        private int GetNodeChecked(TreeNode tv)

        {

            int x = 0;

            if (tv.Checked)

            {

                x++;  

            }

            foreach (TreeNode item in tv.Nodes)

            {

               x+= GetNodeChecked(item);



            }

            return x;



        }



        /// <summary>

        /// 查询TreeView下节点被checked的数目

        /// </summary>

        /// <param name="treev"></param>

        /// <returns></returns>

        private int GetTreeViewNodeChecked(TreeView treev)

        {

            int k = 0;

            foreach (TreeNode item in treev.Nodes)

            {

                k += GetNodeChecked(item);

            }

            return k;

        }



        private void button2_Click(object sender, EventArgs e)

        {



            textBox2.Text = GetTreeViewNodeChecked(treeView1).ToString();

        }





    }

}