C#中进度条的使用

如果在程序中直接更新进度条，是无法响应的。使用BackgroundWorker可以解决该问题。

public partial class Form1 : Form
{
    BackgroundWorker backgroundWorker1 = new backgroundWorker1;
    
    public Form1()
    {
        InitializeComponent();
        Shown += new EventHandler(Form1_Shown);
 
        backgroundWorker1.WorkerReportsProgress = true;  //允许报告进度
        backgroundWorker1.DoWork += new DoWorkEventHandler(backgroundWorker1_DoWork);  //产生新的线程来处理任务
        backgroundWorker1.ProgressChanged += new ProgressChangedEventHandler(backgroundWorker1_ProgressChanged);  //当调用ReportProgress会触发该事件
    }
    
    void Form1_Shown(object sender, EventArgs e)
    {
        backgroundWorker1.RunWorkerAsync(); //开始异步操作
    }

    void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
    {
        //在这里进行程序任务
        for (int i = 0; i <= 100; i++)
        {
            
            backgroundWorker1.ReportProgress(i);  // 报告进度给UI线程
            System.Threading.Thread.Sleep(100);  //模拟耗时较长的任务
        }
    }
    
    //返回到UI线程，更新进度条
    void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
    {
        progressBar1.Value = e.ProgressPercentage; 
    }
}