事件聚合器未在 Xamarin Forms 的 Prism 7.0 中发布

Question

我最近将我的 Xamarin 表单应用程序项目从 Prism 6.3 更新到 Prism 7.0。除了正确订阅但似乎没有发布的事件聚合器之外，一切似乎都运行良好。

这是我使用的部分代码

public ConfigureInventoryEventViewModel(IEventAggregator ea, INavigationService navigationService):base(navigationService,ea)

    {
        TappedBackCommand = new DelegateCommand(TappedBack);

        _ea.GetEvent<SetLocationEvent>().Subscribe(SetLocationDropdown,true);
    }

我正在从模态页面发布活动

public ModalPopupViewModel(IEventAggregator ea, INavigationService 
navigationService):base(navigationService,ea)
{
   ItemTappedCommand = new DelegateCommand<string>(ItemTapped);
}



private void ItemTapped(string strItem)
{
    _ea.GetEvent<SetLocationEvent>().Publish();
}

事件class：

public class SetLocationEvent:PubSubEvent
{
}

请帮忙。

Xamarin 表单 version:2.5.0.280555 Prism.forms:7.0.0396

谢谢

Answer 1

我想你忘了这个：_ea = ea

public ConfigureInventoryEventViewModel(IEventAggregator ea, INavigationService navigationService):base(navigationService,ea)
{
    _ea = ea;

    TappedBackCommand = new DelegateCommand(TappedBack);
    _ea.GetEvent<SetLocationEvent>().Subscribe(SetLocationDropdown,true);
}

public ModalPopupViewModel(IEventAggregator ea, INavigationService navigationService):base(navigationService,ea)
{
    _ea = ea;

    ItemTappedCommand = new DelegateCommand<string>(ItemTapped);
}

事件聚合器未在 Xamarin Forms 的 Prism 7.0 中发布

Event Aggregators not publishing in Prism 7.0 for Xamarin Forms

eventaggregator

xamarin.forms

prism-7