c# - 如何使用 FileSystemWatcher 监视父目录下特定名称的所有文件夹？

Question

我的目录结构如下所示，其中可以将 csv 文件添加到任何子目录。 (业务逻辑是订单文件先保存在“Vendor”文件夹下，审核通过后移至“Processed”文件夹。)

我只想监控名为“Processed”的文件夹。例如，如果有文件添加到“已处理”文件夹，我想得到通知并在回调方法中做一些事情。如果文件添加到“供应商”文件夹下，我想忽略它们。我应该如何配置 FileSystemWatcher 来实现这一目标？

这就是我现在得到的。

public static void Watch()
{
   FileSystemWatcher watcher = new FileSystemWatcher();
   watcher.Path = path; //here is the path of the "Order" folder;
   watcher.Created += FileSystemWatcher_Created;
   watcher.EnableRaisingEvents = true;         
}

private static void FileSystemWatcher_Created(object source, FileSystemEventArgs e)
{
   //do something when there are new files added to the watched directory
}

Answer 1

FileSystemWatcher 有一个名为 IncludeSubdirectories 的属性，当为 true 时，IncludeSubdirectories 递归遍历整个子树，而不仅仅是直接子目录。

所以一个例子是这样的(修改后的 MSDN 例子):

private static void Watch(string watch_folder)
{
    FileSystemWatcher watcher = new FileSystemWatcher();
    watcher.IncludeSubdirectories = true;
    watcher.Path = watch_folder;
    /* Watch for changes in LastAccess and LastWrite times, and
       the renaming of files or directories. */
    watcher.NotifyFilter = NotifyFilters.LastAccess | NotifyFilters.LastWrite
       | NotifyFilters.FileName | NotifyFilters.DirectoryName;

    // Add event handlers.
    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.
}

另见

• FileSystemWatcher , MSDN

更新

这是一个关于如何过滤通知以仅对基于@MickyD 评论的 Processed 文件夹使用react的小型控制台示例:

class Program
{
    static void Main(string[] args)
    {

        try
        {
            string path = Path.Combine(Directory.GetCurrentDirectory(), "Order");
            Console.WriteLine(path);
            FileSystemWatcher fileSystemWatcher = new FileSystemWatcher(path);
            fileSystemWatcher.IncludeSubdirectories = true;
            fileSystemWatcher.Changed += FileSystemWatcher_Changed;
            fileSystemWatcher.EnableRaisingEvents = true;

            Process.GetCurrentProcess().WaitForExit();
            fileSystemWatcher.Dispose();
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.Message);
        }
    }

    private static void FileSystemWatcher_Changed(object sender, FileSystemEventArgs e)
    {
        if (e.Name.Contains("Processed"))
            Console.WriteLine("Processed folder has changed");
    }
}