c# - 带有进度条报告的 stream.copyto

Question

我想合并 2 个大文件但是 atm 我的代码只在复制 1 个文件后更新进度有没有更好的方法来报告进度这是我的复制代码 atm

 max = files.Count;
 MessageBox.Show("Merge Started");
 using (Stream output = File.OpenWrite(dest))
   {
      foreach (string inputFile in files)
        {
          using (Stream input = File.OpenRead(inputFile))
            {
              input.CopyTo(output);
              count++;
              progress = count * 100 / max;
              backgroundWorker2.ReportProgress(Convert.ToInt32(progress));
            }
        }
  }
MessageBox.Show("Merge Complete");

Answer 1

您可以分块读取文件。

你应该通知中间的BackgroundWorker。

using (Stream output = File.OpenWrite(dest))
{
    foreach (string inputFile in files)
    {
        using (Stream input = File.OpenRead(inputFile))
        {
            byte[] buffer = new byte[16 * 1024];

            int read;
            while ((read = input.Read(buffer, 0, buffer.Length)) > 0)
            {
                output.Write(buffer, 0, read);

                // report progress back
                progress = (count / max + read / buffer.Length /* part of this file */) *  100;
                backgroundWorker2.ReportProgress(Convert.ToInt32(progress));
            }

            count++;
            progress = count * 100 / max;
            backgroundWorker2.ReportProgress(Convert.ToInt32(progress));
        }
    }
}