stream.copyto與進度條報告

Question

我想合並2個大文件，但atm我的代碼只更新1個文件復制后的進度是否有更好的方法來報告進度這是我的復制代碼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

您可以以塊的形式讀取文件。

您應該在兩者之間通知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));
        }
    }
}

Answer 2

這是我最終使用感謝帕特里克幫助了很多的代碼

            List<string> files = new List<string>();
            if (file1 != null && file2 != null)
            {
                files.Add(file1);
                files.Add(file2);
            }
            if (file3 != null)
            {
                files.Add(file3);
            }
            if (file4 != null)
            {
                files.Add(file4);
            }
                    max = files.Count;
                    MessageBox.Show("Merge Started");
                    using (Stream output = File.OpenWrite(dest))
                    {
                        foreach (string inputFile in files)
                        {
                            using (Stream input = File.OpenRead(inputFile))
                            {
                                byte[] buffer = new byte[32 * 1024];
                                int read;
                                while ((read = input.Read(buffer, 0, buffer.Length)) > 0)
                                {
                                    output.Write(buffer, 0, read);
                                    count++;
                                    // report progress back
                                    progress = count * 100 / read;
                                    backgroundWorker2.ReportProgress(Convert.ToInt32(progress));
                                }
                            }
                        }
                    }
                    MessageBox.Show("Merge Complete");