public Abnormal_event() { InitializeComponent(); Abnormal_event_ViewModel abnormal_Event_ViewModel = new Abnormal_event_ViewModel(); List <string> event_categorys = abnormal_Event_ViewModel.Selectevent_category(); List <string> Application_unit_names = abnormal_Event_ViewModel.SelectApplication_unit_name(); this.cbb_category.ItemsSource = event_categorys; this.cbb_application_unit.ItemsSource = Application_unit_names; }