如何确定文件夹是否已完成复制c#

2023年8月15日 286次阅读

我有一个问题：如何确定文件夹是否已完成从一个位置复制到另一个位置？

目前,我的FileSystemWatcher会在复制目录中的文件后立即触发多个事件.我想要的是,当成功复制该文件夹中的所有文件时,将触发一个单独的事件.我的代码现在看起来像这样：

static void Main(string[] args)
    {
        String path = @"D:\Music";
        FileSystemWatcher mWatcher = new FileSystemWatcher();
        mWatcher.Path = path;
        mWatcher.NotifyFilter = NotifyFilters.LastAccess;
        mWatcher.NotifyFilter = mWatcher.NotifyFilter | NotifyFilters.LastWrite;
        mWatcher.NotifyFilter = mWatcher.NotifyFilter | NotifyFilters.DirectoryName;
        mWatcher.IncludeSubdirectories = true;
        mWatcher.Created += new FileSystemEventHandler(mLastChange);
        mWatcher.Changed += new FileSystemEventHandler(mLastChange);

        mWatcher.EnableRaisingEvents = true;
        Console.WriteLine("Watching path: " + path);



        String exit;
        while (true)
        {
               exit = Console.ReadLine();
               if (exit == "exit")
                   break;

        }


    }



    private static void mLastChange(Object sender, FileSystemEventArgs e)
    {
        Console.WriteLine(e.ChangeType + " " + e.FullPath);
    }

最佳答案 不幸的是,FileSystemWatcher没有告诉你文件写完的时间.所以你的选择是……

>在假设没有更多更改到来时,在上次写入后设置超时
>让编写应用程序放置一个多种类型的锁定文件,告诉任何其他程序它已完成.

在重新阅读您的问题之后……听起来您对其他应用程序没有任何控制权.

因此,您需要某种超时值来确定何时完成所有写入操作.基本上创建一个计时器,在每个filesystemwatcher事件之后重置…当它超时时,你会触发表明它完成的单个事件.

以下是如何将其添加到代码中的方法……

static void Main(string[] args)
{
    Timer.Interval = 5000; // 5 seconds - change to whatever is appropriate
    Timer.AutoReset = false;
    Timer.Elapsed += TimeoutDone;
    String path = @"D:\Music";
    FileSystemWatcher mWatcher = new FileSystemWatcher();
    mWatcher.Path = path;
    mWatcher.NotifyFilter = NotifyFilters.LastAccess;
    mWatcher.NotifyFilter = mWatcher.NotifyFilter | NotifyFilters.LastWrite;
    mWatcher.NotifyFilter = mWatcher.NotifyFilter | NotifyFilters.DirectoryName;
    mWatcher.IncludeSubdirectories = true;
    mWatcher.Created += new FileSystemEventHandler(mLastChange);
    mWatcher.Changed += new FileSystemEventHandler(mLastChange);

    mWatcher.EnableRaisingEvents = true;
    Console.WriteLine("Watching path: " + path);
    Timer.Start();

    String exit;
    while (true)
    {
        exit = Console.ReadLine();
        if (exit == "exit")
            break;

    }
}

private static Timer Timer = new Timer();

private static void TimeoutDone(object source, ElapsedEventArgs e)
{
    Console.WriteLine("Timer elapsed!");
}

private static void mLastChange(Object sender, FileSystemEventArgs e)
{
    Console.WriteLine(e.ChangeType + " " + e.FullPath);
    if (Timer != null)
    {
        Timer.Stop();
        Timer.Start();
    }
}
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