c# - .NET FileSystemWatcher 检测 NTFS 安全变化

Question

.NET FileSystemWatcher 的 Changed 事件 MSDN documentation说:

The Changed event is raised when changes are made to the size, system attributes, last write time, last access time, or security permissions of a file or directory in the directory being monitored.

但是，当我尝试使用此类来捕获目录或文件的 NTFS 安全更改时，Changed 事件永远不会触发。

有没有办法不用轮询就可以做到这一点？

Answer 1

FileSystemWatcher 会监视安全权限更改。
当您设置 FileSystemWatcher.NotifyFilter 时，您需要包含 NotifyFilters.Security 标志。我尝试了下面的代码，更改了 Temp 文件夹中文件的权限。 Changed 事件被触发。

public static void Main()
{
    var fileSystemWatcher = new FileSystemWatcher("C:\\Temp", "*.*");
    fileSystemWatcher.NotifyFilter = NotifyFilters.Security;
    fileSystemWatcher.Changed += fileSystemWatcher_Changed;
    fileSystemWatcher.EnableRaisingEvents = true;
    Thread.Sleep(-1);
}

private static void fileSystemWatcher_Changed(object sender, FileSystemEventArgs e)
{
}