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using System;

using System.IO;

namespace FileMonitor

{

    public class Program

    {

        private static FileSystemWatcher s_watcher;

        public static void Main(string[] args)

        {

        // 監(jiān)視當(dāng)前目錄下所有的txt文件

            WatchFiles(".", "*.txt");

            Console.ReadLine();

            UnWatchFiles();

        }

        public static void WatchFiles(string path, string filter)

        {

            s_watcher = new FileSystemWatcher(path, filter)

            {

                IncludeSubdirectories = true

            };

            s_watcher.Created += OnFileChanged;

            s_watcher.Changed += OnFileChanged;

            s_watcher.Deleted += OnFileChanged;

            s_watcher.Renamed += OnFileRenamed;

// 啟用事件的觸發(fā)，這一點非常重要

            s_watcher.EnableRaisingEvents = true;

            Console.WriteLine("watching file changes...");

        }

        public static void UnWatchFiles()

        {

            s_watcher.Created -= OnFileChanged;

            s_watcher.Changed -= OnFileChanged;

            s_watcher.Deleted -= OnFileChanged;

            s_watcher.Renamed -= OnFileRenamed;

            s_watcher.Dispose();

            s_watcher = null;

        }

        private static void OnFileRenamed(object sender, RenamedEventArgs e) =>

            Console.WriteLine($"file {e.OldName} {e.ChangeType} to {e.Name}");

        private static void OnFileChanged(object sender, FileSystemEventArgs e) =>

            Console.WriteLine($"file {e.Name} {e.ChangeType}");

    }

}

using System;

using System.IO;

using System.Security.Permissions;

public class Watcher

{

    public static void Main()

    {

        Run();

    }

    [PermissionSet(SecurityAction.Demand, Name = "FullTrust")]

    private static void Run()

    {

        string[] args = Environment.GetCommandLineArgs();

        // If a directory is not specified, exit program.

        if (args.Length != 2)

        {

            // Display the proper way to call the program.

            Console.WriteLine("Usage: Watcher.exe (directory)");

            return;

        }

        // Create a new FileSystemWatcher and set its properties.

        using (FileSystemWatcher watcher = new FileSystemWatcher())

        {

            watcher.Path = args[1];

            // 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;

            // Only watch text files.

            watcher.Filter = "*.txt";

            // Add event handlers.

            watcher.Changed += OnChanged;

            watcher.Created += OnChanged;

            watcher.Deleted += OnChanged;

            watcher.Renamed += OnRenamed;

            // Begin watching.

            watcher.EnableRaisingEvents = true;

            // Wait for the user to quit the program.

            Console.WriteLine("Press 'q' to quit the sample.");

            while (Console.Read() != 'q') ;

        }

    }

    // Define the event handlers.

    private static void OnChanged(object source, FileSystemEventArgs e) =>

        // Specify what is done when a file is changed, created, or deleted.

        Console.WriteLine($"File: {e.FullPath} {e.ChangeType}");

    private static void OnRenamed(object source, RenamedEventArgs e) =>

        // Specify what is done when a file is renamed.

        Console.WriteLine($"File: {e.OldFullPath} renamed to {e.FullPath}");

}