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[英]How to access ShellViewModel in an Caliburn.Micro application?
[英]Shared Child ViewModel To ShellViewmodel on caliburn.Micro
子ViewModel如何將共享DataGrid.selectedItem信息共享給Caliburn.Micro中的父ViewModel?
您可以使用事件聚合器來實現此目的。 在當前的場景中,您可以首先聲明一個Message對象,該對象將用於在Child和Parent View Models之間傳遞信息。
public class SelectedItemChangedMessage<T>
{
public T SelectedItem;
}
要發布消息,可以使用EventAggregator類。 例如,您可以從ChildViewModel執行以下操作。
public class ChildViewModel
{
private IEventAggregator _eventAggregator;
public ChildViewModel(IEventAggregator eventAggregator)
{
_eventAggregator = eventAggregator;
}
public void Change()
{
_eventAggregator.PublishOnUIThread(new SelectedItemChangedMessage<string>(){ SelectedItem = selectedItem });
}
}
然后,在您的ParentViewModel中,您需要訂閱EventAggregator
public class ShellViewModel:Screen, IHandle<SelectedItemChangedMessage<string>>
{
private IEventAggregator _eventAggregator;
public ShellViewModel(IEventAggregator eventAggregator)
{
_eventAggregator = eventAggregator;
_eventAggregator.Subscribe(this);
}
public void Handle(SelectedItemChangedMessage<string> message)
{
Debug.WriteLine($"Item Changed, current selection : {message}");
}
}
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