C#实现Treeview节点"正在载入..."效果

 public partial class FrmTreeView : Form
    {
        public FrmTreeView()
        {
            InitializeComponent();

        }

        private void FrmTreeView_Load(object sender, EventArgs e)
        {
            this.treeView1.Nodes.Add(new TreeNode("root"));
            
        }

        private void treeView1_AfterSelect(object sender, TreeViewEventArgs e)
        {
            if ( (e.Node.Tag == null || e.Node.Tag.ToString() == "") && e.Node.Text != "正在载入...")
            {
                ThreadStartInfo s = new ThreadStartInfo();

                s.node = e.Node;

                s.node.Tag = 1;//已经载入过的就不要载入了

                new System.Threading.Thread(new System.Threading.ThreadStart(s.LoadNode)).Start();

                e.Node.Nodes.Add("正在载入...");
            
            }
        }
    }
代码
 public class ThreadStartInfo
    {
        public TreeNode node = null;

        public void LoadNode()
        {
            System.Threading.Thread.Sleep(5000);

            string[] str = { "jin", "csdn", "sina", "google", "yahoo", "nba", "fifa" };

            this.AddNode(node, str);
        }

        delegate void dAddNode(TreeNode node, string[] str);

        void AddNode(TreeNode node, string[] str)
        {
            if (this.node.TreeView.FindForm().InvokeRequired)//判断是否需要主窗体线程调用
            {
                this.node.TreeView.FindForm().Invoke(new dAddNode(AddNode), new object[] { node, str });//主窗体线程调用
            }
            else
            {
                node.Nodes.Clear();

                foreach (string strNode in str)
                {
                    node.Nodes.Add(strNode);
                }
            
            }
        
        }

    }

转自:http://www.cnblogs.com/zhangtao/articles/1440759.html