DotNetZip ExtractProgress错误？

ExtractProgressEventArgs.EntriesTotal

ExtractProgressEventArgs.EntriesExtracted

public static void UnZip(string zipFile, string destination)
{
    using(ZipFile zip = ZipFile.Read(zipFile))
    {                
        zip.ExtractProgress += new EventHandler<ExtractProgressEventArgs>(zip_ExtractProgress);

        foreach (ZipEntry entry in zip)
        {
            entry.Extract(destination, ExtractExistingFileAction.OverwriteSilently);                    
        }
        Console.WriteLine(\"DONE\");
    }
}

static void zip_ExtractProgress(object sender, ExtractProgressEventArgs e)
{
    if(e.EventType == ZipProgressEventType.Extracting_AfterExtractEntry)
        Console.WriteLine(String.Format(\"{0} : {1} / {2} = {3}%\", e.CurrentEntry.FileName, e.EntriesTotal, e.EntriesExtracted, ((double)e.EntriesTotal / (double)e.EntriesExtracted) * 100.00));
}