WinForm 中TreeView 控件的使用实例

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            treeView1.Nodes.Clear();
            TreeNode tree = new TreeNode("根节点");
            treeView1.Nodes.Add(tree);
        }

        /// <summary>
        /// 添加子节点的方法
        /// </summary>
        public void addChildCode()
        {
            //首先判断是否选中节点中的位置
            if (treeView1.SelectedNode == null)
            {
                MessageBox.Show("请选择一个节点！", "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            else
            {
                if (textBox1.Text != "")
                {
                    //创建一个节点对象并初始化
                    TreeNode tmp = new TreeNode(textBox1.Text);
                    //在TreeView组件中加入子节点
                    treeView1.SelectedNode.Nodes.Add(tmp);
                    treeView1.SelectedNode = tmp;
                    treeView1.ExpandAll();
                }
                else
                {
                    MessageBox.Show("textbox组件必须填写节点名称！", "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Information);
                    return;
                }
            }
        }

        /// <summary>
        /// 添加兄弟节点的方法
        /// </summary>
        public void addParent()
        {
            try
            {
                if (treeView1.SelectedNode == null)
                {
                    MessageBox.Show("请选择一个节点！", "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Information);
                }
                else
                {
                    if (textBox1.Text != null)
                    {
                        //创建一个节点对象并且初始化
                        TreeNode tmp = new TreeNode(textBox1.Text);
                        //在TreeView 组件中加入兄弟节点
                        treeView1.SelectedNode.Parent.Nodes.Add(tmp);
                        treeView1.ExpandAll();
                    }
                    else
                    {
                        MessageBox.Show("textbox组件必须填写节点名称！", "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Information);
                        return;
                    }
                }
            }
            catch
            {
                TreeNode rmp = new TreeNode("根节点");
                treeView1.Nodes.Add(rmp);
            }
        }

        /// <summary>
        /// 判断鼠标点击事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void treeView1_MouseDown(object sender, MouseEventArgs e)
        {
            //获取是否是鼠标右键点击
            if (e.Button == MouseButtons.Right)
            {
                contextMenuStrip1.Show(this, new Point(e.X, e.Y));
            }
        }

        /// <summary>
        /// 展开下一节点
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_Click(object sender, EventArgs e)
        {
            treeView1.SelectedNode.Expand();
        }

        /// <summary>
        /// 展开全部节点
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button2_Click(object sender, EventArgs e)
        {
            //定位根节点
            treeView1.SelectedNode = treeView1.Nodes[0];
            //展开组件中的所有节点
            treeView1.SelectedNode.ExpandAll();
        }

        /// <summary>
        /// 折叠全部节点
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button3_Click(object sender, EventArgs e)
        {
            //定位根节点
            treeView1.SelectedNode = treeView1.Nodes[0];
            //收缩组件中的所有节点
            treeView1.SelectedNode.Collapse();
        }

        /// <summary>
        /// 点击快捷菜单中的“加入子节点”菜单项，则调用用户自定义的addChildCode()方法
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void 加入子节点ToolStripMenuItem_Click_1(object sender, EventArgs e)
        {
            addChildCode();
        }

        /// <summary>
        /// 点击快捷菜单中的“加入兄弟节点”菜单项，则调用用户自定义的addParent()方法
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void 加入兄弟节点ToolStripMenuItem_Click_1(object sender, EventArgs e)
        {
            addParent();
        }

        /// <summary>
        /// 点击快捷菜单中的“删除节点”菜单项，则删除节点
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void 删除节点ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (treeView1.SelectedNode.Nodes.Count == 0)
            {
                treeView1.SelectedNode.Remove();
            }
            else
            {
                MessageBox.Show("请先删除此节点中的子节点！", "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
        }


        
    }
}