如何避免ViewModel中的命令混乱？

Question

我正在构建一个使用相当多命令的应用程序,它们使我的viewmodel变得混乱.MVVM对我来说是新手,很抱歉,这个问题有点愚蠢.有没有办法减少混乱？例如,在这里你可以看到杂乱的一部分..

    private void InitializeCommands()
    {
        LogoutCommand = new RelayCommand(Logout);
        OpenCommand = new RelayCommand(SetImage);
        SaveCommand = new RelayCommand(SaveImage, SaveImageCanExecute);
        UploadToFlickrCommand = new RelayCommand(UploadToFlickr);
        CropCommand = new RelayCommand(SetCropMouseEvents);
        RemoveRedEyeCommand = new RelayCommand(SetRemoveRedEyeMouseEvents);
        TextInputCropCommand = new RelayCommand(CropFromText);
        ReloadImageCommand = new RelayCommand(ReloadImage);
        FlipYCommand = new RelayCommand(FlipY);
        Rotate90RCommand = new RelayCommand(Rotate90R);
        FlipXCommand = new RelayCommand(FlipX);
        ToGrayscaleCommand = new RelayCommand(ToGrayscale);
        ToSepiaCommand = new RelayCommand(ToSepia);
        WindowClosingCommand = new RelayCommand(WindowClosing);
        EffectsViewCommand = new RelayCommand(() => CurrentToolView = new EffectsView());
        AddTextCommand = new RelayCommand(() => CurrentToolView = new AddTextView());
        ResizeCommand = new RelayCommand(() => CurrentToolView = new ResizeView());
        CropViewCommand = new RelayCommand(() => CurrentToolView = new CropView());
        RedEyeCommand = new RelayCommand(() => CurrentToolView = new RedEyeView());
        RotateViewCommand = new RelayCommand(() => CurrentToolView = new RotateView());
        ExitCommand = new RelayCommand(() => Application.Current.Shutdown());
        FullscreenCommand = new RelayCommand(() =>
                                                 {
                                                     var fs = new FullscreenView
                                                                  {FullscreenImage = CurrentImage.LoadedImage};
                                                     fs.Show();
                                                 });
        HandleDropCommand = new RelayCommand<DragEventArgs>(e => OnFileDrop(this, e));
        Messenger.Default.Register<User>(this, "UserLogin", SetUser);
        Messenger.Default.Register<FlickrAccount>(this, "AddedAccount", AddAccount);
        Messenger.Default.Register<string>(this, "INeedAUser", SendUser);
        Messenger.Default.Register<string>(this, "INeedAImage", SendImage);
    }

Answer 1

所以你有命令:

1. 文件操作(打开,保存,上传到闪烁)

2. 窗口操作(全屏,关闭)

3. 编辑(旋转,调整大小,颜色等)

考虑将相关命令分组(编写)在一个称为FileCommands的自定义类中.如果适用,创建多级层次结构.如果视图中有分层菜单,则可能需要类似的命令层次结构.

然后,为每个命令组(例如FileController)创建一个Controller,并在控制器中创建create方法,该方法将从FileCommands组中注册具有关联服务的命令.

有关如何实际实现Controller/ViewModel映射的一些想法,请参见http://waf.codeplex.com/示例应用程序(例如BookController.cs).但请注意,它不是完全相同的情况(没有将命令分成组).