Xamarin MvvmCross 从另一个视图模型调用命令处理程序

Question

I have two view models: ListItemViewModel and ListViewModel . My ListViewModel contains many ListItemViewModel objects, when I try to delete one item, I'm binding DeleteCommand in ListItemViewModel like this:

public IMvxCommand DeleteCommand => new MvxCommand(DeleteCommandHandler);

The problem is that DeleteCommandHandler is in ListViewModel ... How can I call handler from another view model?

UPDATE 1

Got the question why do I need this. The reason of my question is that in handler I will need to make an API call which requires dependency injection, but my ListItemViewModel must have default empty constructor because of automapper, so all the business logic I want to move to "parent view model" which is ListViewModel

Answer 1

Try using messaging services to communicate b/w different viewmodels. In your case, the DeleteCommandHandler will trigger in ListItemViewModel and then will pass a message to ListViewModel sending details of item deleted.

Refer to the link on how to implement Messaging.