[英]Shared Child ViewModel To ShellViewmodel on caliburn.Micro
子ViewModel如何将共享DataGrid.selectedItem信息共享给Caliburn.Micro中的父ViewModel?
You can make use of Event Aggregators for the purpose. 您可以使用事件聚合器来实现此目的。 In your current Scenario, you could start by declaring a Message object which would be used to pass the information between the Child and Parent View Models. 在当前的场景中,您可以首先声明一个Message对象,该对象将用于在Child和Parent View Models之间传递信息。
public class SelectedItemChangedMessage<T>
{
public T SelectedItem;
}
To publish the message, you can use EventAggregator class. 要发布消息,可以使用EventAggregator类。 For example, you could do the following from ChildViewModel. 例如,您可以从ChildViewModel执行以下操作。
public class ChildViewModel
{
private IEventAggregator _eventAggregator;
public ChildViewModel(IEventAggregator eventAggregator)
{
_eventAggregator = eventAggregator;
}
public void Change()
{
_eventAggregator.PublishOnUIThread(new SelectedItemChangedMessage<string>(){ SelectedItem = selectedItem });
}
}
And then, in your ParentViewModel, you would need to subscribe to EventAggregator 然后,在您的ParentViewModel中,您需要订阅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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