问是否通过重新查询或添加到集合来更新可观察集合？

EN

class ViewModel1
{
    ObservableCollection<Object> entities;

    public ViewModel1()
    {
        EventsManager.ObjectAddedEvent += new EventHandler<ObjectAddedEventArgs>(EventsManager_ObjectAddedEvent);
        entities = new ObservableCollection<Object>();
    }

    void EventsManager_ObjectAddedEvent(object sender, ObjectAddedEventArgs e)
    {
        entities.Add(e.ObjectAdded);
    }
}

class EventsManager
{
    public static event EventHandler<ObjectAddedEventArgs> ObjectAddedEvent;

    public static void RaiseObjectAddedEvent(Object objectAdded)
    {
        EventHandler<ObjectAddedEventArgs> temp = ObjectAddedEvent;
        if (temp != null)
        {
            temp(null, new ObjectAddedEventArgs(objectAdded));
        }
    }
}

class ObjectAddedEventArgs : EventArgs
{
    public Object ObjectAdded { get; protected set; }

    public ObjectAddedEventArgs(Object objectAdded)
    {
        ObjectAdded = objectAdded;
    }
}

class ViewModel2
{
    public void AddObject(Object o)
    {
        EventsManager.RaiseObjectAddedEvent(o);
    }
}