目录修改监控

Question

我正在构建一个C#应用程序,它将监视指定的目录以进行更改和添加,并将信息存储在数据库中.

我想避免检查每个单独的文件进行修改,但我不确定我是否完全可以信任文件访问时间.

在目录中获取最近修改过的文件的最佳方法是什么？

它只会在用户询问时检查修改,它不会是一个持续运行的服务.

Answer 1

使用FileSystemWatcher对象.这是一些代码来做你想要的.

    // Declares the FileSystemWatcher object
    FileSystemWatcher watcher = new FileSystemWatcher(); 

    // We have to specify the path which has to monitor

     watcher.Path = @"\\somefilepath";     

    // This property specifies which are the events to be monitored
     watcher.NotifyFilter = NotifyFilters.LastAccess |
       NotifyFilters.LastWrite | NotifyFilters.FileName | notifyFilters.DirectoryName; 
    watcher.Filter = "*.*"; // Only watch text files.

    // Add event handlers for specific change events...

    watcher.Changed += new FileSystemEventHandler(OnChanged);
    watcher.Created += new FileSystemEventHandler(OnChanged);
    watcher.Deleted += new FileSystemEventHandler(OnChanged);
    watcher.Renamed += new RenamedEventHandler(OnRenamed);
    // Begin watching.
    watcher.EnableRaisingEvents = true;


    // Define the event handlers.
    private static void OnChanged(object source, FileSystemEventArgs e)
    {
    // Specify what is done when a file is changed, created, or deleted.
    }

    private static void OnRenamed(object source, RenamedEventArgs e)
    {
    // Specify what is done when a file is renamed.
    }

Answer 2

嗯...有趣的问题。首先，我会向您指出FileSystemWatcher类。但是，如果您想让它根据用户请求工作，那么您似乎可能需要最初存储目录信息，然后在每次用户请求时进行比较。我可能会选择 FileSystemWatcher 并存储结果。