Question

我尝试使用ReactiveUI为附件列表实现主/详细信息。这是我的视图模型的简化版本：

public class AttachmentsViewModel : ReactiveObject, ISupportsActivation
 {
     private ReactiveList<Attachment> _attachments;
     public ReactiveList<Attachment> Attachments
     {
         get => _attachments;
         set => this.RaiseAndSetIfChanged( ref _attachments, value );
     }

     private IReactiveDerivedList<AttachmentViewModel> _attachmentViewModels;
     public IReactiveDerivedList<AttachmentViewModel> AttachmentViewModels
     {
         get => _attachmentViewModels;
         set => this.RaiseAndSetIfChanged(ref _attachmentViewModels, value );
     }

     private AttachmentViewModel _selected;
     public AttachmentViewModel Selected
     {
         get => _selected;
         set => this.RaiseAndSetIfChanged( ref _selected, value );
     }
}

在我看来，我有ListView和一组控件让用户编辑属性（例如TextBox名为AttachmentName。根据上面的视图模型，我将在视图中执行此操作：

public class AttachmentsView : IViewFor<AttachmentsViewModel>
{
    public AttachmentsView()
    {
        InitializeComponent();

        this.WhenActivated( d => {
            this.OneWayBind( ViewModel, vm => vm.AttachmentViewModels, v => v.List.ItemsSource ).DisposeWith( d );
            this.Bind( ViewModel, vm => vm.Selected, v => v.List.SelectedItem ).DisposeWith( d );

            this.Bind( ViewModel, vm => vm.Selected.Name, v => v.AttachmentName.Text ).DisposeWith( d );
        }
    }
}

所有这些都按预期工作，当我点击ListView中的某一行时，我面板中的控件会相应更改。

但是，当我取消选择当前选定的项目时，AttachmentName仍会显示旧值（而不显示任何内容）。我假设linq表达式不会触发属性更改事件，因为绑定是多个属性深度？

这有什么办法吗？也许有另一种方法来实现主 - 细节导航/编辑？

Answer 1

您可以在视图中观察SelectedItem并更改AttachmentName：

this.WhenAnyValue(x => x.ViewModel.Selected).Where(x => x == null)
    .Subscribe(selected => AttachmentName.Text == "").DisposeWith(d);

ReactiveUI - 主/详细绑定 - 取消选择当前记录

1 个答案: