c# - Caliburn Micro-在ViewModels之间共享数据

Question

从Caliburn Micro“简单MDI”示例开始。我想实现以下目标:

我想在ViewModels之间共享类的引用。 shareme.count应该作为对所有ViewModel的引用传递。这将允许我从每个ViewModel中进行更改。

如何才能达到接近Caliburn Micro惯例的水平？

ShellViewModel.cs

public class ShellViewModel : Conductor<IScreen>.Collection.OneActive {

SharedClass _shareme;

public SharedClass shareme {
    get { return _shareme; }
    set {
        _shareme = value;
        NotifyOfPropertyChange(() => shareme);
    }
}

public ShellViewModel() {
    shareme.count = 1;
}

public void OpenTab() {
    ActivateItem(new TabViewModel {
        DisplayName = "Tab " + shareme.count++
    });
}

TabViewModel.cs

public class TabViewModel : Screen {}

AppBootstrapper.cs

    public class AppBootstrapper : BootstrapperBase {
    SimpleContainer container;

    public AppBootstrapper() {
        Initialize();
    }

    protected override void Configure() {

        container = new SimpleContainer();

        container.Singleton<IWindowManager, WindowManager>();
        container.Singleton<IEventAggregator, EventAggregator>();
        container.PerRequest<IShell, ShellViewModel>();
    }

    protected override object GetInstance(Type service, string key) {
        var instance = container.GetInstance(service, key);
        if (instance != null)
            return instance;

        throw new InvalidOperationException("Could not locate any instances.");
    }

    protected override IEnumerable<object> GetAllInstances(Type service) {
        return container.GetAllInstances(service);
    }

    protected override void BuildUp(object instance) {
        container.BuildUp(instance);
    }

    protected override void OnStartup(object sender, System.Windows.StartupEventArgs e)
    {
        DisplayRootViewFor<IShell>();
    }
}

Answer 1

还将用作您重复问题的答案。

EventAggregator不仅用于“事件”，您还可以将消息传递数据到正在监听消息或事件签名的任何或所有 View 模型。

public class ViewModelA : Screen, IHandle<ShareMeMessageA>
{
  private readonly IEventAggregator _events;
  private int _sharemecount;
  public class ViewModelA(IEventAggregator events){

       _events = events;
       _events.Subscribe(this);
  }

  //... other bits out for brevity 
  //-- EDIT -- 
  public void SomeEventClick(){
    _event.PublishOnUiThread(new ShareMeMessageB(){ ...  etc ... });
  }

  protected override void Deactivated(bool close){
    _events.Unsubscribe(this);
  }

  private void Handle(ShareMeMessageA msg)
  {
      if(msg != null)
        sharemecount = msg.Count;
  }
}

因为这只是一个示例，所以您根本不需要传递类对象，您可以传递想要的 bool ，整数，浮点数等任何类型。