如何知道目录中是否没有进一步的更改？C#

using System;
using System.IO;

class Program
{
    static void Main()
    {
        // 监视的目录路径
        string path = "C:\\目录路径";

        // 创建一个新的FileSystemWatcher对象
        FileSystemWatcher watcher = new FileSystemWatcher();
        
        // 设置要监视的目录
        watcher.Path = path;

        // 监视所有文件和子目录的更改
        watcher.IncludeSubdirectories = true;

        // 只监视文件的更改
        watcher.NotifyFilter = NotifyFilters.FileName | NotifyFilters.LastWrite;

        // 添加事件处理程序
        watcher.Changed += OnChanged;
        watcher.Created += OnChanged;
        watcher.Deleted += OnChanged;
        watcher.Renamed += OnRenamed;

        // 开始监视
        watcher.EnableRaisingEvents = true;

        // 等待用户退出程序
        Console.WriteLine("Press 'q' to quit the sample.");
        while (Console.Read() != 'q') ;
    }

    // 文件或目录更改事件处理程序
    private static void OnChanged(object source, FileSystemEventArgs e)
    {
        // 输出更改的文件或目录路径
        Console.WriteLine($"File or Directory: {e.FullPath} {e.ChangeType}");
    }

    // 文件或目录重命名事件处理程序
    private static void OnRenamed(object source, RenamedEventArgs e)
    {
        // 输出重命名前后的文件或目录路径
        Console.WriteLine($"File or Directory renamed: {e.OldFullPath} to {e.FullPath}");
    }
}