The field 'App._showingExceptionDialog' is assigned but its value is never used

The field 'App._showingExceptionDialog' is assigned but its value is never used

Unreachable code detected

'NavigationBase.Orientation' is obsolete: 'Work in progress.'

Possible null reference argument for parameter 'pageService' in 'void NavigationService.SetService(IPageService pageService)'.

Dereference of a possibly null reference.

Possible null reference argument for parameter 'dataContext' in 'bool NavigationService.Navigate(Type pageType, object dataContext)'.

Dereference of a possibly null reference.

Possible null reference argument for parameter 'dataContext' in 'bool NavigationService.Navigate(string pageTag, object dataContext)'.

Possible null reference argument for parameter 'dataContext' in 'bool NavigationService.Navigate(int pageId, object dataContext)'.

Possible null reference argument for parameter 'dataContext' in 'bool NavigationService.NavigateExternal(object frameworkElement, object dataContext)'.