异步加载树节点

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Threading;
using System.Windows.Forms;

namespace FormCallBackTest
{
    public partial class Form1 : Form
    {
        //声明委托已实现回调机制 
        private delegate void CallBackTest();
        private CallBackTest callBackTest;

        public delegate void DelegateDone();//定义一个委托
        public DelegateDone GetDelegateHandler; //声明委托

        public Form1()
        {
            InitializeComponent();

            //初始化回调
            GetDelegateHandler = new DelegateDone(ThdFunc); //绑定需要回调的函数 
        }
        private void button1_Click(object sender, EventArgs e)
        {
            Thread th1 = new Thread(new ThreadStart(DoWork));//创建线程
            th1.IsBackground = true;//后台线程
            th1.Start();//启动线程 
        }

        private void ThdFunc()
        {
            List<string> listTest = new List<string>();

            GetData(ref listTest);//获取数据
            InitTreeInfo(listTest);//构建树节点
        }
        private void GetData(ref List<string> listTest)
        {
            listTest.Clear();
            for (int i = 0; i < 1000000; i++)
            {
                listTest.Add("测试数据" + i);
            }
        }
        private void InitTreeInfo(List<string> listTest)
        {
            for (int i = 0; i < listTest.Count; i++)
            {
                TreeNode SubNode = new TreeNode();
                SubNode.Name = Convert.ToString(i + 1);
                SubNode.Text = listTest[i];
                this.Invoke((MethodInvoker)delegate()
                {
                    treeView1.Nodes.Add(SubNode);
                });//防止跨线程
            }
        }
        void DoWork()
        {
            callBackTest = new CallBackTest(GetDelegateHandler);
            CallBack(callBackTest);
        }
        //使用委托 
        private void CallBack(CallBackTest Delegate)
        {
            Delegate();
        }

    }
}
   源码下载地址：https://files-cdn.cnblogs.com/files/yc1224/%E5%BC%82%E6%AD%A5%E5%8A%A0%E8%BD%BD%E6%A0%91%E8%8A%82%E7%82%B9.zip