利用BackGroundWorker在Winforms控件上进行GUI操作的跨线程调用？

using System;
using System.ComponentModel;
using System.Windows.Forms;

namespace WinformsApp
{
    public partial class MainForm : Form
    {
        private BackgroundWorker worker;

        public MainForm()
        {
            InitializeComponent();

            // 创建BackgroundWorker对象
            worker = new BackgroundWorker();

            // 注册DoWork事件
            worker.DoWork += Worker_DoWork;

            // 注册ProgressChanged事件（可选）
            worker.ProgressChanged += Worker_ProgressChanged;
            worker.WorkerReportsProgress = true;

            // 注册RunWorkerCompleted事件
            worker.RunWorkerCompleted += Worker_RunWorkerCompleted;
        }

        private void Worker_DoWork(object sender, DoWorkEventArgs e)
        {
            // 在后台线程中执行耗时操作
            // 这里可以是任何需要在后台执行的任务

            // 模拟耗时操作
            System.Threading.Thread.Sleep(2000);

            // 报告进度或中间结果（可选）
            worker.ReportProgress(50, "50% completed");

            // 继续执行其他耗时操作...

            // 最后的结果将会作为e.Result传递给RunWorkerCompleted事件
            e.Result = "Operation completed";
        }

        private void Worker_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            // 在UI线程上更新进度条或显示其他反馈信息
            progressBar.Value = e.ProgressPercentage;
            statusLabel.Text = e.UserState.ToString();
        }

        private void Worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            // 在UI线程上处理操作完成后的逻辑
            if (e.Error != null)
            {
                // 处理错误情况
                MessageBox.Show("An error occurred: " + e.Error.Message);
            }
            else if (e.Cancelled)
            {
                // 处理取消情况
                MessageBox.Show("Operation was cancelled");
            }
            else
            {
                // 处理成功完成的情况
                MessageBox.Show("Operation completed: " + e.Result.ToString());
            }
        }

        private void startButton_Click(object sender, EventArgs e)
        {
            // 启动BackgroundWorker执行任务
            worker.RunWorkerAsync();
        }

        private void cancelButton_Click(object sender, EventArgs e)
        {
            // 取消BackgroundWorker的执行（可选）
            if (worker.IsBusy)
            {
                worker.CancelAsync();
            }
        }
    }
}