I have tried everything I could think of and everything I found on the web and have not had any luck, still a blank page.

here is my xaml file;

<ListView x:Name="AutoView" ItemsSource="{Binding AutoData}" SelectedItem="{Binding SelectedItem}" SeparatorVisibility="None"  Grid.Row="1" Grid.ColumnSpan="6" BackgroundColor="Purple">
        <ListView.ItemTemplate>
            <DataTemplate>
                <ViewCell>
                    <ViewCell.View>
                        <Grid>
                            <Grid.RowDefinitions>
                                <RowDefinition Height="27"/>
                            </Grid.RowDefinitions>
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="65"/>
                                <ColumnDefinition Width="5"/>
                                <ColumnDefinition Width="55"/>
                                <ColumnDefinition Width="65"/>
                                <ColumnDefinition Width="60"/>
                                <ColumnDefinition Width="36"/>
                            </Grid.ColumnDefinitions>
                            <Label Grid.Column="0" Grid.Row="0" FontSize="Medium" TextColor="White" Text="{Binding Year}" HorizontalTextAlignment="Center"/>
                            <Label Grid.Column="2" Grid.Row="0" FontSize="Medium" TextColor="White" Text="{Binding Name}" HorizontalTextAlignment="Start" Grid.ColumnSpan="2"/>
                            <Switch x:Name="{Binding Id}" IsToggled="{Binding IsChecked, Mode=TwoWay}" Toggled="Handle_Toggled" Grid.Column="6" Grid.Row="0" Grid.ColumnSpan="2"/>
                        </Grid>
                    </ViewCell.View>
                </ViewCell>
            </DataTemplate>
        </ListView.ItemTemplate>
    </ListView>
</Grid>

My code in my view model looks like this, I have changed it multiple times but this is where it is at now.

    public ObservableCollection<AutoWithSwitch> MyList = new ObservableCollection<AutoWithSwitch>();
    public ObservableCollection<AutoWithSwitch> AutoData = new ObservableCollection<AutoWithSwitch>(); //{ get { return MyList; } }
    private IPopupNavigation _popup { get; set; }
    private PopupPage _modalPage;

    public event PropertyChangedEventHandler PropertyChanged;

    public UpdateCarsViewModel()
    {
        //Analytics.TrackEvent("Top of Constructor in UpdateCarsViewModel");
        GetDisplayData();
        Sort.SortOrder(MyList, i => i.Year, false);

        _popup = PopupNavigation.Instance;
        _modalPage = new PopupPage();
    }

    public void GetDisplayData()
    {
        MileageItemRepository repository = new MileageItemRepository();
        var response = repository.GetAuto2();

        //MyList.Clear();
        foreach (var item in response)
        {
            Analytics.TrackEvent("Car Data GetDisplayData: carId "   item.Id   " Name = "   item.CarDesc   " Year = "   item.CarYear);
            
            AutoData.Add(new AutoWithSwitch
            {
                Id = item.Id,
                Year = item.CarYear,
                Name = item.CarDesc,
                IsChecked = item.IsDefault
            });
            
            Analytics.TrackEvent("In GetDisplayData in UpdateCarsViewModel CarYear = "   item.CarYear);
        }
        //AutoData = MyList;
    }

As you can see I have logging in there and I can see the car information being retrieved from the DB table, it just will not display.

CodePudding user response：

Per your code snippets, ListView controls is binding to AutoData of type ObservableCollection and the data in side of list view will be binding to the properties of the class AutoWithSwitch to the four properties: Id,Year,Name and IsChecked. So you should claim and use the AutoData with set and get property like below:

public class UpdateCarsViewModel : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;

    private ObservableCollection<AutoWithSwitch> mylist;
    public ObservableCollection<AutoWithSwitch> AutoData
    {
        get { return mylist; }
        set { mylist = value; }
    }
    public UpdateCarsViewModel()
    {
        GetDisplayData();
    }

    public void GetDisplayData()
    {
        //get data logic 
        AutoData = new ObservableCollection<AutoWithSwitch>()
        {
            new AutoWithSwitch()
            {
                Id = "1",
                Year = "2022",
                Name = "Steve_Jobs",
                IsChecked = false
            }
        };
    }
  }
}

Note:Make sure you can successfully retrieve data from below,

MileageItemRepository repository = new MileageItemRepository();
var response = repository.GetAuto2();

CodePudding user response：

This was helpful and aswered my question. Hope this is what you meant by answering that it was helpful.