public async Task GetAllUnknownPointByServiceAsync()
        {
            var service           = new UnknownPointService();
            var listUnknownPoints = await service.GetAllUnknownPoints(Token.tokenCurrent);

            ListUnknownPoints = new ObservableCollection <UnknownPoint>(listUnknownPoints);
        }
        public async Task DeleteUnknownPointAsync()
        {
            var service    = new UnknownPointService();
            int resultCode = await service.DeleteUnknownPointById((int)SelectedUnknownPoint.IdUnknownPoint, Token.tokenCurrent);

            if (resultCode == Constants.CODE_SUCCESS)
            {
                ListUnknownPoints.Remove(SelectedUnknownPoint);
            }
            else
            {
                var messageDialog = new Windows.UI.Popups.MessageDialog("L'élément à supprimer est introuvable");
                await messageDialog.ShowAsync();
            }
            _navigationService.NavigateTo("ListUnknownPoint");
        }