File.Copy，mscorlib.dll中发生类型为'System.IO.IOException'的未处理异常

Question

我正在使用Windows窗体中的C＃编写程序，该程序位于后台，并且需要监视对目录的更改并将这些更改自动复制到目标目录中。 该程序还将在启动时检查两个目录之间是否有任何更改，并将其复制。 理想情况下，此程序运行时，目标目录将是基本目录的副本。

这是我的代码。

    private const string GamesDirectory = "D:\\Games";
    private const string TestDirectory = "D:\\Test";

    #region Fields

    private readonly Process _launcher;

    #endregion

    #region Constructors

    /// <summary>
    /// Initialises an instance of the <see cref="GameReviewManager" /> class.
    /// </summary>
    public GameReviewManager()
    {
        InitializeComponent();

        _launcher = new Process();
        _launcher.StartInfo.FileName = "GameReviewLauncher";
        _launcher.EnableRaisingEvents = true;
        _launcher.Exited += LauncherExited;
        _launcher.Start();

        MonitorDirectory(TestDirectory);
    }

    #endregion

    #region Private Methods

    /// <summary>
    /// Handles the launcher exited event.
    /// </summary>
    /// <param name="sender">The sender.</param>
    /// <param name="e">The event.</param>
    private void LauncherExited(object sender, EventArgs e)
    {
        _launcher.Start();
    }

    private static void MonitorDirectory(string path)
    {
        FileSystemWatcher fileSystemWatcher = new FileSystemWatcher();
        fileSystemWatcher.Path = path;
        fileSystemWatcher.Created += FileSystemWatcherCreated;
        fileSystemWatcher.Renamed += FileSystemWatcherRenamed;
        fileSystemWatcher.Deleted += FileSystemWatcherDeleted;
        fileSystemWatcher.EnableRaisingEvents = true;

        //Now Create all of the directories
        foreach (string dirPath in Directory.GetDirectories(GamesDirectory, "*", SearchOption.AllDirectories))
        {
            Directory.CreateDirectory(dirPath.Replace(GamesDirectory, TestDirectory));
        }

        //Copy all the files & Replaces any files with the same name
        foreach (string newPath in Directory.GetFiles(GamesDirectory, "*", SearchOption.AllDirectories))
        {
            File.Copy(newPath, newPath.Replace(GamesDirectory, TestDirectory), false);
        }
    }

    private static void FileSystemWatcherCreated(object sender, FileSystemEventArgs e)
    {
        Console.WriteLine("File created: {0}", e.Name);
    }

    private static void FileSystemWatcherRenamed(object sender, FileSystemEventArgs e)
    {
        Console.WriteLine("File renamed: {0}", e.Name);
    }

    private static void FileSystemWatcherDeleted(object sender, FileSystemEventArgs e)
    {
        Console.WriteLine("File deleted: {0}", e.Name);
    }

    #endregion
}

当我运行程序时，出现此错误，mscorlib.dll中发生了'System.IO.IOException'类型的未处理异常

它在MonitorDirectory方法的第二个foreach循环中尝试更改的第一个文件上引发此错误。

我不确定是什么导致此错误。 如果我删除测试文件夹中的内容，然后启动程序，则不会发生该错误。

任何帮助，将不胜感激。 :)

Answer 1

File.Copy()的第三个参数必须为true以使其能够覆盖已存在的文件。

File.Copy(newPath, newPath.Replace(GamesDirectory, TestDirectory), true);