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TreeView的CheckBoxs的第三种状态，怎么点击node前的“+”的时候图标不变

码拜
从网上找了一个有TreeView的CheckBoxs的第三种状态（有部分子结点被选中）的代码，实现的时候发现，在点击node前的+的时候，图片也改变了，怎么让他不改变呢？
开始的时候，是下图

点击 子2 前的“+”，就变成了下面

怎么才能在点击节点的“+”的时候，node的图片不变？
代码如下： 
//规则1：取消选定
//规则1.1：检查能否有子节点，需清除全部子节点的选定状态；
//规则1.2：检查能否有父节点，如有，则根据兄弟节点的选定状态修改父节点的选定状态
//规则2：选定
//规则2.1：检查能否有子节点，设置全部子节点为选定状态
//规则2.2：检查能否有父节点，如有，则根据兄弟节点的选定状态修改父节点的选定状态
//我们用ImageIndex等于0、1、2分别代表该节点未选中、选中、子节点部分选中三种状态
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace TreeView
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        /// <summary>
        /// 选中节点之后，选中节点的全部子节点
        /// </summary>
        /// <param name="currNode"></param>
        /// <param name="state"></param>
        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 Form1_Load(object sender, EventArgs e)
        {
            this.treeView1.ImageList = imageList1;
            treeView1.ImageIndex = 1;
            treeView1.SelectedImageIndex = 1;
            if (treeView1.Nodes.Count > 0)
            {
                if (treeView1.SelectedNode != null)
                {
                    //this.treeView1.ImageList = imageList1;
                    //TreeNode newNode = new TreeNode("Parent");
                    //treeView1.SelectedNode.Nodes.Add(newNode);
                    //this.treeView1.SelectedNode.ImageIndex = 0;
                    //this.treeView1.SelectedNode.SelectedImageIndex = 1;
                    //this.setChildNodeCheckedState(this.treeView1.SelectedNode, true);
                }
            }
            else
            {
                TreeNode node = new TreeNode();
                node.Text = "根";
                this.treeView1.Nodes.Add(node);
                TreeNode node1 = new TreeNode();
                node1.Text = "子1";
                treeView1.Nodes[0].Nodes.Add(node1);
                TreeNode node2 = new TreeNode();
                node2.Text = "子2";
                treeView1.Nodes[0].Nodes.Add(node2);
                TreeNode node21 = new TreeNode();
                node21.Text = "子21";
                node2.Nodes.Add(node21);
                TreeNode node3 = new TreeNode();
                node3.Text = "子3";
                treeView1.Nodes[0].Nodes.Add(node3);
            }
        }
        private void treeView1_NodeMouseDoubleClick(object sender, TreeNodeMouseClickEventArgs e)
        {
            //if (e.Node.ImageIndex == 1)
            //{
            //    e.Node.SelectedImageIndex = 0;
            //    e.Node.ImageIndex = 0;
            //    SetNodeImg11(e.Node);
            //    SetNodeImg12(e.Node);
            //}
            //else
            //{
            //    e.Node.SelectedImageIndex = 1;
            //    e.Node.ImageIndex = 1;
            //    SetNodeImg21(e.Node);
            //    SetNodeImg22(e.Node);
            //}
        }
        private void treeView1_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e)
        {
            if (e.Node.ImageIndex == 1)
            {
                e.Node.SelectedImageIndex = 0;
                e.Node.ImageIndex = 0;
                SetNodeImg11(e.Node);
                SetNodeImg12(e.Node);
            }
            else
            {
                e.Node.SelectedImageIndex = 1;
                e.Node.ImageIndex = 1;
                SetNodeImg21(e.Node);
                SetNodeImg22(e.Node);
            }
        }
        //设置节点选定状态：规则.1：检查能否有子节点，需清除全部子节点的选定状态；
        private void SetNodeImg11(TreeNode tn)
        {
            foreach (TreeNode t in tn.Nodes)
            {
                t.SelectedImageIndex = 0;
                t.ImageIndex = 0;
                if (t.Nodes.Count != 0)
                {
                    SetNodeImg11(t);
                }
            }
        }
        //设置节点选定状态：规则.2：检查能否有父节点，如有，则根据兄弟节点的选定状态修改父节点的选定状态
        private void SetNodeImg12(TreeNode tn)
        {
            if (tn.Parent == null)
                return;
            int Img0Num = 0;
            int Img1Num = 0;
            int Img2Num = 0;
            //统计兄弟节点中选中情况
            foreach (TreeNode t in tn.Parent.Nodes)
            {
                if (t.ImageIndex == 0)
                    Img0Num++;
                if (t.ImageIndex == 1)
                    Img1Num++;
                if (t.ImageIndex == 2)
                    Img2Num++;
            }
            //假如兄弟节点中选中和未选中都有
            if ((Img2Num != 0) || ((Img0Num != 0) && (Img1Num != 0)))
            {
                tn.Parent.SelectedImageIndex = 2;
                tn.Parent.ImageIndex = 2;
            }
            else
            {
                tn.Parent.StateImageIndex = 0;
                tn.Parent.ImageIndex = 0;
            }
            //递归
            SetNodeImg12(tn.Parent);
        }
        //设置节点选定状态：规则.1：检查能否有子节点，设置全部子节点为选定状态
        private void SetNodeImg21(TreeNode tn)
        {
            foreach (TreeNode t in tn.Nodes)
            {
                t.SelectedImageIndex = 1;
                t.ImageIndex = 1;
                if (t.Nodes.Count != 0)
                {
                    SetNodeImg21(t);
                }
            }
        }
        //设置节点选定状态：规则.2：检查能否有父节点，如有，则根据兄弟节点的选定状态修改父节点的选定状态
        private void SetNodeImg22(TreeNode tn)
        {
            if (tn.Parent == null)
                return;
            int Img0Num = 0;
            int Img1Num = 0;
            int Img2Num = 0;
            //统计兄弟节点中选中情况
            foreach (TreeNode t in tn.Parent.Nodes)
            {
                if (t.ImageIndex == 0)
                    Img0Num++;
                if (t.ImageIndex == 1)
                    Img1Num++;
                if (t.ImageIndex == 2)
                    Img2Num++;
           }
            //假如兄弟节点中选中和未选中都有
            if ((Img2Num != 0) || ((Img0Num != 0) && (Img1Num != 0)))
            {
                tn.Parent.SelectedImageIndex = 2;
                tn.Parent.ImageIndex = 2;
            }
            else if ((Img1Num == 0) && (Img2Num == 0))
            {
                tn.Parent.SelectedImageIndex = 0;
                tn.Parent.ImageIndex = 0;
            }
            else
            {
                tn.Parent.StateImageIndex = 1;
                tn.Parent.ImageIndex = 1;
            }
            //递归
            SetNodeImg22(tn.Parent);
        }
        private void treeView1_AfterCheck(object sender, TreeViewEventArgs e)
         {
        //    if (e.Node.ImageIndex == 1)
        //    {
        //        e.Node.SelectedImageIndex = 0;
        //        e.Node.ImageIndex = 0;
        //        SetNodeImg11(e.Node);
        //        SetNodeImg12(e.Node);
        //    }
        //    else
        //    {
        //        e.Node.SelectedImageIndex = 1;
        //        e.Node.ImageIndex = 1;
        //        SetNodeImg21(e.Node);
        //        SetNodeImg22(e.Node);
        //    }
        }
        private void treeView1_AfterSelect(object sender, TreeViewEventArgs e)
        {
        }
 
    }
}
解决方案

40

引用 11 楼 yuankaiwsl 的回复:

1、用这种方法，不能区分点击的是“-”或“+”还是内容
2、在NodeMouseClick事件里添加判断if(e.Node.Bounds.Contains(new Point(e.X, e.Y)))，但是这样点击图片不能实现选中不选中

改成一下代码，即可解决！

var bound = Rectangle.Union(e.Node.Bounds, new Rectangle(e.Node.Bounds.Location - new Size(19, 0), new Size(19, 15)));
if (bound.Contains(new Point(e.X, e.Y)))
{...}
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