多线程 ui 进度条

using System;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            Task.Run(() =>
            {
                for (int i = 0; i <= 100; i++)
                {
                    Thread.Sleep(50); // 模拟耗时操作
                    UpdateProgressBar(i);
                }
            });
        }
        private void UpdateProgressBar(int i)
        {
            if (progressBar1.InvokeRequired)
            {
                progressBar1.Invoke(
                new Action<int>(UpdateProgressBar), i
                );
            }
            else
            {
                progressBar1.Value = i;
            }
        }
    }
}