c# - DotNetZip ExtractProgress 错误？

Question

ExtractProgressEventArgs.EntriesTotal 和 ExtractProgressEventArgs.EntriesExtracted 始终为零。这是一个已知的错误？请参阅下面的代码:

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));
}

Answer 1

定义的行为:

来自 http://cheeso.members.winisp.net/DotNetZipHelp/html/91d797c7-efff-99a3-2b14-6c9a9797b324.htm

EntriesExtracted Number of entries extracted so far. This is set only if the EventType is Extracting_BeforeExtractEntry or Extracting_AfterExtractEntry, and the Extract() is occurring witin the scope of a call to ExtractAll().

原因很简单:如果您在自己控制的循环中调用 Extract()，则库无法知道您计划调用它多少次，您已经调用了多少次一行，是否将前 5 次与后 5 次一起计算，依此类推。所以 DotNetZip 无法为您提供有关您完成了多少的可靠信息。

您有两个简单的解决方法:

• 使用一个 int 计数器，每次调用循环中的 Extract() 时该计数器都会递增。

• 调用 ExtractAll()，在这种情况下，它将发出 ExtractProgressEvents，其中 EntriesExtracted 值设置为一个有意义的数字。

选项 1:

    int n;
    using(ZipFile zip = ZipFile.Read(zipFile))
    {                
        zip.ExtractProgress += zip_ExtractProgress;
        n = 0;
        foreach (ZipEntry entry in zip)
        {
            n++;
            entry.Extract(destination, ExtractExistingFileAction.OverwriteSilently);                    
        }
        Console.WriteLine("DONE");
    }

选项 2:

    using(ZipFile zip = ZipFile.Read(zipFile))
    {                
        zip.ExtractProgress += zip_ExtractProgress;
        zip.ExtractAll(destination,
               ExtractExistingFileAction.OverwriteSilently);                    
        Console.WriteLine("DONE");
    }