Create Viewmodel from Controller / Model. Populate lists from database - wpf

Question

I'm working on my first WPF MVVM application. I created a database and wrote queries to fetch album names and song names. Now I want to fill a list in my View with the album names and a second list with corresponding songs. I'm new to c# and WPF. I'd like to know how a view model would like for my controller would look like.
My controller:
public class BandManagerController
{
private bandkramEntities _context;
public BandManagerController()
{
_context = new bandkramEntities();
}
public List<AlbumData> GetAlbumList()
{
return _context.albums
.Select(a => new AlbumData
{
AlbumID = a.AlbumID,
AlbumName = a.AlbumName,
})
.ToList();
}
public List<SongData> GetSongList(int albumID)
{
return _context.songs
.Where(s => s.AlbumID == albumID)
.Select(s => new SongData
{
SongID = s.SongID,
SongName = s.SongName
})
.ToList();
}
}
I created a helper class with the NotifyOfPropertyChange class and a song and album data class:
AlbumData.cs
public class AlbumData
{
public string AlbumName { get; set; }
public int AlbumID { get; set; }
}
SongData.cs
public class SongData
{
public string SongName { get; set; }
public int SongID { get; set; }
}
For a better overview I want to split my Viewmodel into 4 main parts.
SongViewModel.cs
public class SongViewModel : NotifyOfPropertyChange
{
public SongViewModel()
{
}
public string SongName { get; set; }
public int SongID { get; set; }
}
AlbumViewModel.cs
public class AlbumViewModel : NotifyOfPropertyChange
{
public AlbumViewModel()
{
}
public string AlbumName { get; set; }
public int AlbumID { get; set; }
}
SongListViewModel.cs
AlbumListViewModel.cs
I would like to know how 3. and 4. would have to look like to fill the album list with the album names and show corresponding songs in a second list.

Answer 1

With MVVM you would lose the controller and just have a ViewModel. There you would have your lists as such(including a notify property changed)
private ObservableCollection<SongData> _songList;
public ObservableCollection<SongData> SongList
{
get { return _songList; }
set { SetProperty(ref _songList, value, () => SongList); }
}
Then you would load this list at some point
public void LoadSongData(int albumID)
{
Using(YourContext _context = new YourContext)
{
SongList = new ObservableCollection(_context.songs
.Where(s => s.AlbumID == albumID)
.Select(s => new SongData
{
SongID = s.SongID,
SongName = s.SongName
})
.ToList());
}
}