Catel.MVVM.Views.ViewLoadManager.InvokeViewLoadEvent C# (CSharp) Метод

        protected void InvokeViewLoadEvent(IView view, ViewLoadStateEvent viewLoadStateEvent)
        {
            if (_lastInvokedViewLoadStateEvent == viewLoadStateEvent)
            {
                return;
            }

            if (view == null)
            {
                return;
            }

            EventHandler<ViewLoadEventArgs> handler;

            switch (viewLoadStateEvent)
            {
                case ViewLoadStateEvent.Loading:
                    handler = ViewLoading;
                    break;

                case ViewLoadStateEvent.Loaded:
                    handler = ViewLoaded;
                    break;

                case ViewLoadStateEvent.Unloading:
                    handler = ViewUnloading;
                    break;

                case ViewLoadStateEvent.Unloaded:
                    handler = ViewUnloaded;
                    break;

                default:
                    throw new ArgumentOutOfRangeException("viewLoadStateEvent");
            }

            if (handler != null)
            {
                handler(this, new ViewLoadEventArgs(view));
            }

            _lastInvokedViewLoadStateEvent = viewLoadStateEvent;
        }
        #endregion