树形框treeView演示程序

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace Tree
{
 /// <summary>
 /// Form1 的摘要说明。
 /// </summary>
 public class Form1 : System.Windows.Forms.Form
 {
  p rivate System.Windows.Forms.TreeView treeView1;
  p rivate System.Windows.Forms.Label label1;
  p rivate System.Windows.Forms.TextBox textBox1;
  p rivate System.Windows.Forms.Button button1;
  p rivate System.Windows.Forms.Button button2;
  p rivate System.Windows.Forms.Button button3;
  p rivate System.Windows.Forms.Button button4;
  p rivate System.Windows.Forms.ImageList imageList1;
  p rivate System.ComponentModel.IContainer components;

  public Form1()
  {
   //
   // Windows 窗体设计器支持所必需的
   //
   InitializeComponent();

   //
   // TODO: 在 InitializeComponent 调用后添加任何构造函数代码
   //
  }

  /// <summary>
  /// 清理所有正在使用的资源。
  /// </summary>
  protected override void Dispose( bool disposing )
  {
   if( disposing )
   {
    if (components != null)
    {
     components.Dispose();
    }
   }
   base.Dispose( disposing );
  }

  #region Windows 窗体设计器生成的代码
  /// <summary>
  /// 设计器支持所需的方法 - 不要使用代码编辑器修改
  /// 此方法的内容。
  /// </summary>
  p rivate void InitializeComponent()
  {
   this.components = new System.ComponentModel.Container();
   System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(Form1));
   this.treeView1 = new System.Windows.Forms.TreeView();
   this.imageList1 = new System.Windows.Forms.ImageList(this.components);
   this.label1 = new System.Windows.Forms.Label();
   this.textBox1 = new System.Windows.Forms.TextBox();
   this.button1 = new System.Windows.Forms.Button();
   this.button2 = new System.Windows.Forms.Button();
   this.button3 = new System.Windows.Forms.Button();
   this.button4 = new System.Windows.Forms.Button();
   this.SuspendLayout();
   //
   // treeView1
   //
   this.treeView1.ImageList = this.imageList1;
   this.treeView1.Location = new System.Drawing.Point(8, 8);
   this.treeView1.Name = "treeView1";
   this.treeView1.Nodes.AddRange(new System.Windows.Forms.TreeNode[] {
                      new System.Windows.Forms.TreeNode("中华人民共和国", new System.Windows.Forms.TreeNode[] {
                                            new System.Windows.Forms.TreeNode("北京市"),
                                            new System.Windows.Forms.TreeNode("上海市")})});
   this.treeView1.Size = new System.Drawing.Size(208, 148);
   this.treeView1.TabIndex = 0;
   this.treeView1.AfterExpand += new System.Windows.Forms.TreeViewEventHandler(this.treeView1_AfterExpand);
   this.treeView1.AfterCollapse += new System.Windows.Forms.TreeViewEventHandler(this.treeView1_AfterCollapse);
   //
   // imageList1
   //
   this.imageList1.ImageSize = new System.Drawing.Size(16, 16);
   this.imageList1.ImageStream = ((System.Windows.Forms.ImageListStreamer)(resources.GetObject("imageList1.ImageStream")));
   this.imageList1.TransparentColor = System.Drawing.Color.Transparent;
   //
   // label1
   //
   this.label1.Location = new System.Drawing.Point(224, 16);
   this.label1.Name = "label1";
   this.label1.Size = new System.Drawing.Size(104, 16);
   this.label1.TabIndex = 1;
   this.label1.Text = "树节点标签内容： ";
   //
   // textBox1
   //
   this.textBox1.Location = new System.Drawing.Point(224, 32);
   this.textBox1.Name = "textBox1";
   this.textBox1.Size = new System.Drawing.Size(128, 21);
   this.textBox1.TabIndex = 2;
   this.textBox1.Text = "罗斌";
   //
   // button1
   //
   this.button1.Location = new System.Drawing.Point(224, 56);
   this.button1.Name = "button1";
   this.button1.Size = new System.Drawing.Size(128, 23);
   this.button1.TabIndex = 3;
   this.button1.Text = "添加为根节点";
   this.button1.Click += new System.EventHandler(this.button1_Click);
   //
   // button2
   //
   this.button2.Location = new System.Drawing.Point(224, 80);
   this.button2.Name = "button2";
   this.button2.Size = new System.Drawing.Size(128, 23);
   this.button2.TabIndex = 4;
   this.button2.Text = "添加为子节点";
   this.button2.Click += new System.EventHandler(this.button2_Click);
   //
   // button3
   //
   this.button3.Location = new System.Drawing.Point(224, 104);
   this.button3.Name = "button3";
   this.button3.Size = new System.Drawing.Size(128, 23);
   this.button3.TabIndex = 5;
   this.button3.Text = "删除选中节点";
   this.button3.Click += new System.EventHandler(this.button3_Click);
   //
   // button4
   //
   this.button4.Location = new System.Drawing.Point(224, 128);
   this.button4.Name = "button4";
   this.button4.Size = new System.Drawing.Size(128, 23);
   this.button4.TabIndex = 6;
   this.button4.Text = "关闭应用程序";
   this.button4.Click += new System.EventHandler(this.button4_Click);
   //
   // Form1
   //
   this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
   this.ClientSize = new System.Drawing.Size(360, 166);
   this.Controls.Add(this.button4);
   this.Controls.Add(this.button3);
   this.Controls.Add(this.button2);
   this.Controls.Add(this.button1);
   this.Controls.Add(this.textBox1);
   this.Controls.Add(this.label1);
   this.Controls.Add(this.treeView1);
   this.MaximizeBox = false;
   this.Name = "Form1";
   this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
   this.Text = "演示树视图控件";
   this.Load += new System.EventHandler(this.Form1_Load);
   this.ResumeLayout(false);

  }
  #endregion

  /// <summary>
  /// 应用程序的主入口点。
  /// </summary>
  [STAThread]
  static void Main()
  {
   Application.Run(new Form1());
  }

  p rivate void treeView1_AfterExpand(object sender, System.Windows.Forms.TreeViewEventArgs e)
  {//处理节点展开事件
   e.Node.ImageIndex=1;
   e.Node.SelectedImageIndex=1;
  }

  p rivate void treeView1_AfterCollapse(object sender, System.Windows.Forms.TreeViewEventArgs e)
  {//处理节点收缩事件
   e.Node.ImageIndex=0;
   e.Node.SelectedImageIndex=0;

  }

  p rivate void button1_Click(object sender, System.EventArgs e)
  {//添加根节点
   TreeNode newNode=new TreeNode(this.textBox1.Text,0,0);
   this.treeView1.Nodes.Add(newNode);
   this.treeView1.Select();
  }

  p rivate void button2_Click(object sender, System.EventArgs e)
  {//添加子节点
   TreeNode selectedNode=this.treeView1.SelectedNode;
   if(selectedNode==null)
   {
    MessageBox.Show(this,"添加子节点之前必须先选中一个根节点。","提示信息",MessageBoxButtons.OK,MessageBoxIcon.Warning);
   }
   TreeNode newNode=new TreeNode(this.textBox1.Text,1,1);
   selectedNode.Nodes.Add(newNode);
   selectedNode.SelectedImageIndex=1;
   selectedNode.Expand();
   this.treeView1.Select();
  }
  p rivate void button3_Click(object sender, System.EventArgs e)
  {//删除选定的节点
   TreeNode selectedNode=this.treeView1.SelectedNode;
   if(selectedNode==null)
   {
    MessageBox.Show(this,"删除节点之前必须先选中一个节点。","提示信息",MessageBoxButtons.OK,MessageBoxIcon.Warning);
    return;
   }
   TreeNode parentNode=selectedNode.Parent;
   if(parentNode==null)
   {
    this.treeView1.Nodes.Remove(selectedNode);
   }
   else
   {
    parentNode.Nodes.Remove(selectedNode);
    if(parentNode.Nodes.Count==0)
    {
     parentNode.ImageIndex=1;
     parentNode.SelectedImageIndex=1;
    }
   }
   this.treeView1.Select();
  }

  p rivate void Form1_Load(object sender, System.EventArgs e)
  {//初始化示例节点
   TreeNode RootNode=new TreeNode("中华人民共和国",0,0);
   this.treeView1.Nodes.Add(RootNode);
   this.treeView1.Select();   
   TreeNode SubNode1=new TreeNode("北京市",1,1);
   RootNode.Nodes.Add(SubNode1);
   TreeNode SubNode2=new TreeNode("上海市",1,1);
   RootNode.Nodes.Add(SubNode2);
   TreeNode SubNode3=new TreeNode("天津市",1,1);
   RootNode.Nodes.Add(SubNode3);
   TreeNode SubNode4=new TreeNode("重庆市",1,1);
   RootNode.Nodes.Add(SubNode4);
   TreeNode SubNode5=new TreeNode("渝中区",1,1);
   SubNode4.Nodes.Add(SubNode5);
   TreeNode SubNode6=new TreeNode("长寿区",1,1);
   SubNode4.Nodes.Add(SubNode6);
   SubNode6.SelectedImageIndex=1;
   SubNode6.Expand();   
  }

  p rivate void button4_Click(object sender, System.EventArgs e)
  {//关闭应用程序
   this.Close();
  }
 }
}