c# - 进度条不报告进度

Question

我可能盯着同一个代码太久了，但我似乎无法让进度条在下面的代码中工作。有人有任何提示吗？

private void doBackgroundTIFConverter(object sender, DoWorkEventArgs e)
{
    string tifFileName = (string)e.Argument;
    bm = new Bitmap(tifFileName);
    int total = bm.GetFrameCount(FrameDimension.Page);
    document.Open();
    cb = writer.DirectContent;
    for (int k = 0; k < total; ++k)
    {
        backgroundTIFConverter.ReportProgress(k / total * 100);
        bm.SelectActiveFrame(FrameDimension.Page, k);
        iTextSharp.text.Image img = iTextSharp.text.Image.GetInstance(bm, ImageFormat.Bmp);
        // scale the image to fit in the page
        img.ScalePercent(72f / img.DpiX * 100);
        img.SetAbsolutePosition(0, 0);
        cb.AddImage(img);
        document.NewPage();
    }
    bm.Dispose();
    document.Close();
}

private void progressBackgroundTIFConverter(object sender, ProgressChangedEventArgs e)
{
    splitProgressBar.Value = e.ProgressPercentage;
}

private void completedBackgroundTIFConverter(object sender, RunWorkerCompletedEventArgs e)
{
    splitButton.Enabled = true;
}


private void completedBackgroundTIFConverter(object sender, RunWorkerCompletedEventArgs e)
{
    splitButton.Enabled = true;
}

Answer 1

backgroundTIFConverter.ReportProgress(k / total * 100);

这是一个非常常见的 C# 陷阱，你会在这里得到整数除法。k / total 将始终为零。将表达式重新排序为：

backgroundTIFConverter.ReportProgress(k * 100 / total);

如果要达到 100%，则从总数中减去 1：k * 100 / (total-1)