C# 文件/文件夹监视器

发布于 2024-10-03 04:44:15 字数 291 浏览 1 评论 0 原文

我已经设法使用 FileSystemWatcher 查看文件和文件夹的更改。

我的问题是我无法区分文件和文件夹。文件和文件夹可能具有相同的路径名。

对于删除事件，我什至无法使用肮脏的解决方法来测试 File.Exists(path) 或 Directory.Exists(path)，因为调用该方法时文件/文件夹已被删除。

也许这个对象有我需要的信息，但我没有找到它：

FileSystemEventArgs e

我只想知道更改的项目是文件还是文件夹。

原文

I already managed to see file and folder changes with the FileSystemWatcher.

My problem is that I can't make a difference between files and folder. It's possible that a file and a folder have the same path names.

For the delete event I even can't use a dirty workarround with testing File.Exists(path) or Directory.Exists(path) because the file/folder is already deleted when the method is called.

Maybe this object has the info I need but I didn't found it:

FileSystemEventArgs e

I only want to know if the changed item was a file or a folder.

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友欢 2024-10-10 04:44:15

假设它位于 NTFS 卷上，我认为您可以通过查看更改日记。特别是 FSCTL_READ_USN_JOURNAL 控制代码并查找在 FileAttributes 的 USN_RECORD 查看它是否是 FILE_ATTRIBUTE_DIRECTORY。

您可以在此处找到一个示例（使用 C++，但也可以转换为 C#，或者只是编写一个小型 C++ dll 以从您的应用程序调用）：遍历变更日志记录的缓冲区

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许久 2024-10-10 04:44:15

您可以测试它是否有目录属性：

var attributes = File.GetAttributes(@"c:\somepath");
if ((attributes & FileAttributes.Directory) == FileAttributes.Directory)
{
    // it's a directory
}
else
{
    // it's a file
}

当然，如果它已经被删除了，这将不起作用，你将无法判断类型。

You could test whether it has the Directory attribute:

var attributes = File.GetAttributes(@"c:\somepath");
if ((attributes & FileAttributes.Directory) == FileAttributes.Directory)
{
    // it's a directory
}
else
{
    // it's a file
}

Of course if it has already been deleted this won't work and you won't be able to tell the type.

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一萌ing 2024-10-10 04:44:15

我找到了一个干净且始终有效的解决方案：

观察者的标准设置是针对文件和文件夹的。这在我看来毫无意义，因为我无法找出更改后的对象的类型。

可以创建两个文件观察器。一种用于文件，一种用于文件夹。然后您只需更改默认设置，如下所示：

// for file
fileSysWatchFile.NotifyFilter = NotifyFilters.FileName | NotifyFilters.LastWrite;
// for folder
fileSysWatchDir.NotifyFilter = NotifyFilters.DirectoryName | NotifyFilters.LastWrite;

I've found a solution which is clean and always works:

The standard setting of a watcher is for files and folders. This makes no sense in my eyes since I can't find out which type the changed object had.

It's possible to create two filewatchers. One for files and one for folders. Then you just have to change the default settings as follows:

// for file
fileSysWatchFile.NotifyFilter = NotifyFilters.FileName | NotifyFilters.LastWrite;
// for folder
fileSysWatchDir.NotifyFilter = NotifyFilters.DirectoryName | NotifyFilters.LastWrite;

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