如何使用 FileSystemWatcher 同步兩個文件夾操作

Question

所以，我有一個任務：
實時同步2個目錄的內容
給定 2 個目錄的路徑，監聽目錄 1 的變化並與目錄 2 同步操作。這意味着當我在目錄 1 中創建一個新文件時，相同的文件應該在目錄 2 中，當我刪除或修改文件時也會發生同樣的情況.Dir1 可能有嵌套文件夾。
我有這個起點：

public class Program2
{
    public static void Main(string[] args)
    {
        string sourcePath = @"C:\Users\artio\Desktop\FASassignment\root\dir1";
        string destinationPath = @"C:\Users\artio\Desktop\FASassignment\root\dir2";

        var source = new DirectoryInfo(sourcePath);
        var destination = new DirectoryInfo(destinationPath);

        using var sourceWatcher = new FileSystemWatcher(sourcePath);

        sourceWatcher.NotifyFilter = NotifyFilters.Attributes
                             | NotifyFilters.CreationTime
                             | NotifyFilters.DirectoryName
                             | NotifyFilters.FileName
                             | NotifyFilters.LastAccess
                             | NotifyFilters.LastWrite
                             | NotifyFilters.Security
                             | NotifyFilters.Size;

        sourceWatcher.Changed += OnChanged;
        sourceWatcher.Created += OnCreated;
        sourceWatcher.Deleted += OnDeleted;
        sourceWatcher.Renamed += OnRenamed;
        sourceWatcher.Error += OnError;

        sourceWatcher.Filter = "*.txt";
        sourceWatcher.IncludeSubdirectories = true;
        sourceWatcher.EnableRaisingEvents = true;

        Console.WriteLine("Press enter to exit.");
        Console.ReadLine();
    }

    private static void OnChanged(object sender, FileSystemEventArgs e)
    {
        if (e.ChangeType != WatcherChangeTypes.Changed)
        {
            return;
        }

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

    private static void OnCreated(object sender, FileSystemEventArgs e)
    {
        string value = $"Created: {e.FullPath}";
        Console.WriteLine(value);
    }

    private static void OnDeleted(object sender, FileSystemEventArgs e) =>
        Console.WriteLine($"Deleted: {e.FullPath}");

    private static void OnRenamed(object sender, RenamedEventArgs e)
    {
        Console.WriteLine($"Renamed:");
        Console.WriteLine($"    Old: {e.OldFullPath}");
        Console.WriteLine($"    New: {e.FullPath}");
    }

    private static void OnError(object sender, ErrorEventArgs e) =>
        PrintException(e.GetException());

    private static void PrintException(Exception? ex)
    {
        if (ex != null)
        {
            Console.WriteLine($"Message: {ex.Message}");
            Console.WriteLine("Stacktrace:");
            Console.WriteLine(ex.StackTrace);
            Console.WriteLine();
            PrintException(ex.InnerException);
        }
    }
}   

在onCreated事件中，我添加了這一行：
File.Copy(e.FullPath, 目的地);

如果它在主目錄中，它會創建文件，但如果它在嵌套文件夾中，則會引發錯誤。 然后我嘗試在事件中添加此代碼：

FileInfo destFile = new FileInfo(destinationFolder + srcFile.FullName.Replace(sourceFolder, ""));

if (!Directory.Exists(destFile.DirectoryName) && createFolders)
{
    Directory.CreateDirectory(destFile.DirectoryName);
}

//Check if src file was modified and modify the destination file
if (srcFile.LastWriteTime > destFile.LastWriteTime || !destFile.Exists)
{
    File.Copy(srcFile.FullName, destFile.FullName, true);
} 

另外，沒有用。 我應該怎么做才能完成這項任務？ 我正在學習 c#，我不知道所有的細節，在此先感謝！

Answer 1

我已經完成了這個任務，但在這個程序中仍然存在一個小問題，當我嘗試在 dir1 中創建一個子文件夾時，它給出了未經授權的異常，我無法訪問子文件夾路徑，我認為我沒有以好的方式組合它們，但我不知道如何修復它。現在，該程序在 dir2 中鏡像了 dir1 中的操作，沒有子文件夾。

public class Program2
{
    public static void Main(string[] args)
    {
        string sourcePath = @"C:\Users\artio\Desktop\FASassignment\root\dir1";
        string destinationPath = @"C:\Users\artio\Desktop\FASassignment\root\dir2";

        var source = new DirectoryInfo(sourcePath);
        var destination = new DirectoryInfo(destinationPath);

        using var sourceWatcher = new FileSystemWatcher(sourcePath);

        sourceWatcher.NotifyFilter = NotifyFilters.Attributes
                             | NotifyFilters.CreationTime
                             | NotifyFilters.DirectoryName
                             | NotifyFilters.FileName
                             | NotifyFilters.LastAccess
                             | NotifyFilters.LastWrite
                             | NotifyFilters.Security
                             | NotifyFilters.Size;

        sourceWatcher.Changed += OnChanged;
        sourceWatcher.Created += OnCreated;
        sourceWatcher.Deleted += OnDeleted;
        sourceWatcher.Renamed += OnRenamed;
        sourceWatcher.Error += OnError;

        sourceWatcher.IncludeSubdirectories = true;
        sourceWatcher.EnableRaisingEvents = true;
        Console.WriteLine("Press enter to exit.");
        Console.ReadLine();

    }

    private static void OnChanged(object sender, FileSystemEventArgs e)
    {
        if (e.ChangeType != WatcherChangeTypes.Changed)
        {
            return;
        }
        string destinationPath = @"C:\Users\artio\Desktop\FASassignment\root\dir2";
        var fullPath = e.FullPath;
        var name = e?.Name;
        string destination = Path.Combine(destinationPath, name);
        File.Copy(fullPath, destination, true);
        Console.WriteLine($"Changed: {e.FullPath}");
    }

    private static void OnCreated(object sender, FileSystemEventArgs e)
    {
        string value = $"Created: {e.FullPath}";

        var Destination = @"C:\Users\artio\Desktop\FASassignment\root\dir2";
        var name = e.Name;
        var fullPath = e.FullPath;
        string destination = Path.Combine(Destination, name);
        Console.WriteLine($"Copy to: {destination}");
        Thread.Sleep(1000);
        File.Copy(fullPath, destination, true);
        Console.WriteLine(value);
    }

    private static void OnDeleted(object sender, FileSystemEventArgs e)
    {
        Console.WriteLine($"Deleted: {e.FullPath}");

        var name = e.Name;
        string destinationPath = @"C:\Users\artio\Desktop\FASassignment\root\dir2";
        string destination = Path.Combine(destinationPath, name);
        File.Delete(destination);
    }

    private static void OnRenamed(object sender, RenamedEventArgs e)
    {
        Console.WriteLine($"Renamed:");
        Console.WriteLine($"    Old: {e.OldFullPath}");
        Console.WriteLine($"    New: {e.FullPath}");

        var oldFileName = Path.GetFileName(e.OldFullPath);
        var newFileName = Path.GetFileName(e.FullPath);
        var Destination = @"C:\Users\artio\Desktop\FASassignment\root\dir2";
        var oldDestinationPath = Path.Combine(Destination, oldFileName);
        var newDestinationPath = Path.Combine(Destination, newFileName);
        var info = new FileInfo(oldDestinationPath);
        info.MoveTo(newDestinationPath);
    }

    private static void OnError(object sender, ErrorEventArgs e) =>
        PrintException(e.GetException());

    private static void PrintException(Exception? ex)
    {
        if (ex != null)
        {
            Console.WriteLine($"Message: {ex.Message}");
            Console.WriteLine("Stacktrace:");
            Console.WriteLine(ex.StackTrace);
            Console.WriteLine();
            PrintException(ex.InnerException);
        }
    }
}