C#中進度條的使用

如果在程序中直接更新進度條，是無法響應的。使用BackgroundWorker可以解決該問題。

public partial class Form1 : Form
{
    BackgroundWorker backgroundWorker1 = new backgroundWorker1;
    
    public Form1()
    {
        InitializeComponent();
        Shown += new EventHandler(Form1_Shown);
 
        backgroundWorker1.WorkerReportsProgress = true;  //允許報告進度
        backgroundWorker1.DoWork += new DoWorkEventHandler(backgroundWorker1_DoWork);  //產生新的線程來處理任務
        backgroundWorker1.ProgressChanged += new ProgressChangedEventHandler(backgroundWorker1_ProgressChanged);  //當調用ReportProgress會觸發該事件
    }
    
    void Form1_Shown(object sender, EventArgs e)
    {
        backgroundWorker1.RunWorkerAsync(); //開始異步操作
    }

    void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
    {
        //在這里進行程序任務
        for (int i = 0; i <= 100; i++)
        {
            
            backgroundWorker1.ReportProgress(i);  // 報告進度給UI線程
            System.Threading.Thread.Sleep(100);  //模擬耗時較長的任務
        }
    }
    
    //返回到UI線程，更新進度條
    void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
    {
        progressBar1.Value = e.ProgressPercentage; 
    }
}