C＃Backgroundworker报告2个进度条的进度？

Question

I have several large files that I'm processing and I'm using the backgroundWorker1.ReportProgress(percent) to report the progress as each file is finished. But now I want to have a second progress bar to report the progress for each individual file as it's being processed (and resets for the next file). I can use the current byte position I'm reading from and divide by the total size of the file to get the progress in percentage. But how do I pass this value to progressBar2 if there's only one ProgressChanged event?

Answer 1

One way is to use BackgroundWorker.ReportProgress(Int32, Object) and pass whatever you want, in the userState parameter.

Another is to simply know that when you've reached 100% on the first progress bar you need to increment the other bar.

Answer 2

ReportProgress has an overload which allows you to pass an extra object. You can use this to return any extra state you need.

public void ReportProgress(
    int percentProgress,
    Object userState
)

You can then read the state from ProgressChangedEventArgs.UserState .