C#中Winform的Treeview节点“正在展开...”的效果

C#中Winform的Treeview节点“正在展开...”的效果2011-07-04 csdn博客 jinjazz比较简单的做法，增加一个子节点提示．然后开线程请求真实的子节点，完毕后替换提示节点。

代码如下

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01.using System;02.using System.Collections.Generic;03.using System.ComponentModel;04.using System.Data;05.using System.Drawing;06.using System.Text;07.using System.Windows.Forms;08.09.namespace WindowsApplication1110.{11.public partial class Form1 : Form12.{13.14.//用于控制线程的方法15.public class ThreadStartInfo16.{17.public TreeNode node=null;18.19.//模拟载入数据20.publicvoid LoadNode（）21.{22.System.Threading.Thread.Sleep（5000）;23.string[] str = new string[] { "jinjazz", "csdn" ,"sina","google","yahoo","nba","fifa"};24.this.AddNode（node, str）;25.}26.delegate void dAddNode（TreeNode node, string[] str）;27.28.//添加节点29.void AddNode（TreeNode node, string[] str）30.{31.if （this.node.TreeView.FindForm（）.InvokeRequired）32.{33.this.node.TreeView.FindForm（）.Invoke（new dAddNode（AddNode）, new object[] { node, str }）;34.}35.else36.{37.node.Nodes.Clear（）;38.foreach （string strNode in str）39.{40.node.Nodes.Add（strNode）;41.}42.}43.44.}45.}46.47.public Form1（）48.{49.InitializeComponent（）;50.}51.52.private void Form1_Load（object sender, EventArgs e）53.{54.//添加根节点55.this.treeView1.Nodes.Add（new TreeNode（"root"））;56.this.treeView1.AfterSelect += new TreeViewEventHandler（treeView1_AfterSelect）;57.}58.59.void treeView1_AfterSelect（object sender, TreeViewEventArgs e）60.{61.if （e.Node.Tag==null||e.Node.Tag.ToString（） == ""）62.{63.ThreadStartInfo s = new ThreadStartInfo（）;64.s.node = e.Node;65.//已经载入过的就不要载入了。66.s.node.Tag = 1;67.new System.Threading.Thread（new System.Threading.ThreadStart（s.LoadNode））.Start（）;68.e.Node.Nodes.Add（"正在载入.."）;69.}70.}71.}72.}