BackgroundWorker.ReportProgress报告错误的值

public enum UpdateType {FileCount, ProcessedFiles, LineCount, ProcessedLines, StepUpdate};
public class ProgressUpdate
{
        public UpdateType UpdateType { get { } set { } }
        public string Update { get { } set { } }
}

public class BGWorkerBase : BackgroundWorker
{
    public void BackgroundWorker_ProgressChanged(object sender, ProgressChangedEventArgs e)
    {
        ProgressUpdate update;
        update = (ProgressUpdate)e.UserState;
        switch (update.UpdateType)
        {
            case UpdateType.FileCount:
                MainWindow.FrmDisplayProgress.FileCount = update.Update;
                break;

            case UpdateType.ProcessedFiles:
                MainWindow.FrmDisplayProgress.FileProgress = update.Update;
                break;

            case UpdateType.LineCount:
                MainWindow.FrmDisplayProgress.LineCount = update.Update;
                break;

            case UpdateType.ProcessedLines:
                MainWindow.FrmDisplayProgress.LineProgress = update.Update;
                MainWindow.FrmDisplayProgress.PrecentProgress = e.ProgressPercentage;
                break;

            case UpdateType.StepUpdate:
                MainWindow.FrmDisplayProgress.AddLine(update.Update);
                break;
        }
    }
}

public class TraceFile
{
    public HashSet<string> ExtractValues(HashSet<MyRegex> regexList, BackgroundWorker worker)
    {
        HashSet<string> results = new HashSet<string>();
        int rowNumber = 1;

        foreach (DataRow row in Lines.Rows)
        {
            int percentComplete = (int)(((float)rowNumber / (float)Lines.Rows.Count) * 100);
            worker.ReportProgress(percentComplete, new ProgressUpdate(UpdateType.ProcessedLines, rowNumber++.ToString()));

            // using multiple regex supports different formats for the same data type. For example - more then 1 account format
            foreach (MyRegex regex in regexList)
            {
                MatchCollection matches = regex.Matches(row[\"Text\"].ToString());
                if (matches.Count > 0)
                {
                    foreach (Match result in matches)
                        results.Add(result.ToString());
                }
            }
        }

        return results;
    }
}

case UpdateType.ProcessedLines:
                    MainWindow.FrmDisplayProgress.LineProgress = update.Update;
                    MainWindow.FrmDisplayProgress.PrecentProgress = e.ProgressPercentage;
                    break;

public HashSet<string> ExtractValues(HashSet<MyRegex> regexList, BackgroundWorker worker)
{
    HashSet<string> results = new HashSet<string>();
    int rowNumber = 0;
    DateTime startCount = DateTime.Now;
    DateTime endCount = DateTime.Now;

    foreach (DataRow row in Lines.Rows)
    {
        rowNumber++;
        TimeSpan timeSpan = endCount.Subtract(startCount);
        if ((timeSpan.Milliseconds > 50) | (rowNumber == Lines.Rows.Count))
        {
            int percentComplete = (int)(((float)rowNumber / (float)Lines.Rows.Count) * 100);
            worker.ReportProgress(percentComplete, new ProgressUpdate(UpdateType.ProcessedLines, rowNumber.ToString()));
            startCount = DateTime.Now;
        }

        // using multiple regex supports different formats for the same data type. For example - more then 1 account format
        foreach (MyRegex regex in regexList)
        {
            MatchCollection matches = regex.Matches(row[\"Text\"].ToString());
            if (matches.Count > 0)
            {
                foreach (Match result in matches)
                    results.Add(result.ToString());
            }
        }

        endCount = DateTime.Now;
    }

    return results;
}