c#进度条没有更新backgroundworker

我正在尝试创建一个加密/解密GUI，我有我想要的所有功能。问题是，我试图让进度条运行，而我正在加密文件。我在网上搜索了一些文章，他们都告诉我使用backgroundWorker，这样进度条就可以在一个单独的线程上运行，而不会冻结UI界面。然而，我似乎无法让进度条显示任何内容。

public partial class Form1 : Form
{
   static string key = "";
   cSecureData ed = new cSecureData(key);
   public Form1()
    {
        InitializeComponent();
        InitializeEncryptBG();
    }
    private void InitializeEncryptBG()
    {
        encryptBG.DoWork += new DoWorkEventHandler(encryptBG_DoWork);
        encryptBG.RunWorkerCompleted += new RunWorkerCompletedEventHandler(encryptBG_RunWorkerCompleted);
        encryptBG.ProgressChanged += new ProgressChangedEventHandler(encryptBG_ProgressChanged);
    }
   private void btnEncrypt_Click(object sender, EventArgs e)
   {
        this.btnEncrypt.Enabled = false;
        this.btnDecrypt.Enabled = false;
        /*if (Rijndael.Checked == true)
        {
            ed.EncryptFile(textBox1.Text, textBox2.Text, "1");
        }
        else if (TripleDES.Checked == true)
        {
            ed.EncryptFile(textBox1.Text, textBox2.Text, "2");
        }*/
        encryptBG.RunWorkerAsync();
   }
   private void encryptBG_DoWork(object sender, DoWorkEventArgs e)
   {
        if (Rijndael.Checked == true)
        {
            ed.EncryptFile(textBox1.Text, textBox2.Text, "1");
        }
        else if (TripleDES.Checked == true)
        {
            ed.EncryptFile(textBox1.Text, textBox2.Text, "2");
        }
        FileInfo fInfo1 = new FileInfo(textBox1.Text);
        FileInfo fInfo2 = new FileInfo(textBox2.Text);
        double totSize = fInfo1.Length;
        double curSize = fInfo2.Length;
        while (curSize <= totSize)
        {
            Thread.Sleep(100);
            double percentage = curSize / totSize * 100;
            encryptBG.ReportProgress((int)percentage);
        }
   }
   private void encryptBG_ProgressChanged(object sender, ProgressChangedEventArgs e)
   {
        progressBar.Value = e.ProgressPercentage;
   }
   private void encryptBG_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
   {
        btnEncrypt.Enabled = true;
        btnDecrypt.Enabled = true;
        MessageBox.Show("Done");
   }
}

我的加密方法不在这里，因为我引用了另一个项目的方法。