在caliburn.micro上将子ViewModel共享到ShellViewmodel

时间:2019-06-16 23:31:46

标签: c# caliburn.micro

子视图模型如何与Caliburn.Micro中的父视图模型共享DataGrid.selectedItem信息?

1 个答案:

答案 0 :(得分:0)

您可以为此使用Event Aggregators。在当前方案中,您可以首先声明一个Message对象,该对象将用于在子视图模型和父视图模型之间传递信息。

public class SelectedItemChangedMessage<T>
{
    public T SelectedItem;
}

要发布消息,可以使用EventAggregator类。例如,您可以通过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 });
        }
}

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}");
        }
}