private async Task GetCarsAsync()
        {
            LoadingVisibility = Visibility.Visible;
            Cars.Clear();

            RestRequest request  = new RestRequest("cars", RestSharp.DataFormat.Json);
            var         response = await Client.ExecuteAsync <List <Car> >(request);


            //await Task.Delay(2500);

            LoadingVisibility = Visibility.Hidden;

            response.Data?.ForEach(car => {
                car.DeleteCommand = new RelayCommand(e => {
                    var req = new RestRequest("cars/{id}", Method.DELETE);
                    req.AddParameter("id", car.CarId, ParameterType.UrlSegment);
                    Client.Execute(req);
                    RefreshInfosWithTask();
                }, e2 => true);
                car.UpdateCommand = new RelayCommand(e => {
                    var putRequest      = new RestRequest("cars/" + car.CarId, Method.PUT);
                    CarToSend carToSend = new CarToSend {
                        Name = car.Name
                    };
                    carToSend.setType(car.Typ);
                    putRequest.AddJsonBody(carToSend);
                    Client.Execute(putRequest);
                    RefreshInfosWithTask();
                }, e2 => true);
                car.updateType();
                Cars.Add(car);
            });
        }
 public CarViewModel()
 {
     RefreshCars = new RelayCommand(e => RefreshInfosWithTask(), e2 => true);
     AddCar      = new RelayCommand(e =>
     {
         var request = new RestRequest("cars", Method.POST, RestSharp.DataFormat.Json);
         var cts     = new CarToSend {
             Name = CarToAdd.Name
         };
         cts.setType(CarToAdd.Typ);
         request.AddJsonBody(cts);
         Client.Execute(request);
         RefreshInfosWithTask();
     });
     RefreshInfosWithTask();
 }