C#中Winform的Treeview节点"正在展开..."的效果
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。http://p.blog.csdn.net/images/p_blog_csdn_net/jinjazz/355056/o_tree.JPG
代码如下
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;namespace WindowsApplication11{ public partial class Form1 : Form { //用于控制线程的方法 public class ThreadStartInfo { public TreeNode node=null; //模拟载入数据 publicvoid LoadNode() { System.Threading.Thread.Sleep(5000); string[] str = new string[] { "jinjazz", "csdn" ,"sina","google","yahoo","nba","fifa"}; this.AddNode(node, str); } delegate void dAddNode(TreeNode node, string[] str); //添加节点 void AddNode(TreeNode node, string[] str) { if (this.node.TreeView.FindForm().InvokeRequired) { this.node.TreeView.FindForm().Invoke(new dAddNode(AddNode), new object[] { node, str }); } else { node.Nodes.Clear(); foreach (string strNode in str) { node.Nodes.Add(strNode); } } } } public Form1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { //添加根节点 this.treeView1.Nodes.Add(new TreeNode("root")); this.treeView1.AfterSelect += new TreeViewEventHandler(treeView1_AfterSelect); } void treeView1_AfterSelect(object sender, TreeViewEventArgs e) { if (e.Node.Tag==null||e.Node.Tag.ToString() == "") { ThreadStartInfo s = new ThreadStartInfo(); s.node = e.Node; //已经载入过的就不要载入了。 s.node.Tag = 1; new System.Threading.Thread(new System.Threading.ThreadStart(s.LoadNode)).Start(); e.Node.Nodes.Add("正在载入.."); } } }}
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