C#中Winform的Treeview節點“正在展開...”的效果

比較簡單的做法，增加一個子節點提示．然後開線程請求真實的子節點，完畢後替換提示節點。

代碼如下

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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 WindowsApplication11
10.{
11.    public partial class Form1 : Form
12.    {
13.
14.        //用於控制線程的方法
15.        public class ThreadStartInfo
16.        {
17.            public TreeNode node=null;
18.
19.            //模擬載入數據
20.            public  void 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.            //添加節點
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.                else
36.                {
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.            //添加根節點
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.                //已經載入過的就不要載入了。
66.                s.node.Tag = 1;
67.                new System.Threading.Thread(new System.Threading.ThreadStart(s.LoadNode)).Start();
68.                e.Node.Nodes.Add("正在載入..");
69.            }
70.        }
71.    }
72.}