EntityFrameworkCore with SQLite on Xamarin returns System.NotImplemented - xamarin

Question

I created Xamarin.Forms Windows UWP and Android application with shared project.
To both(UWP and Android) I imported latest stable NuGet packages:
Microsoft.EntityFramework version 1.0.0, Microsoft.EntityFramework.Sqlite version 1.0.0 and Xamarin.Forms 2.3.1.114.
On shared project I created very simple data model:
public class User
{
public int Id { get; set; }
public string UserName { get; set; }
public string Password { get; set; }
public string Notes { get; set; }
}
and very simple data context:
public class DataDbContext: DbContext
{
public static string DatabasePathName;
public DataDbContext()
: base()
{
}
public DataDbContext(DbContextOptions options)
: base(options)
{
}
public DbSet<User> Users { get; set; }
protected override void OnConfiguring(
DbContextOptionsBuilder optionsBuilder)
{
optionsBuilder.UseSqlite(
String.Format("Filename={0}", DataDbContext.DatabasePathName));
base.OnConfiguring(optionsBuilder);
}
}
(The model uses, according to docs.efproject.net, an implicit definition of the field Id as the key and autoincrement.)
Now I initialize database: First set the platform dependent property DatabasePathName and second I'll add three User items to each. I assume that the values of these records will later be read from Resources. At this point, it is just I enter as literals. Records are saved by SaveChanges() method(both UWP and Android returns 3 (saved records)).
Now, if I run Windows UWP application and retrive these records by:
List<User> users = dbContext.Users.ToList();
and everything is as it should be. I read the records, so do I get a value which I put in a TextBlock control.
But if I use the same code in Xamarin Android Application, this code throws System.NotImplementedException exception.
I don't know why. Thank you for the advice.

Answer 1

There are still a few known issues with Xamarin's implementation of the .NET Standard. See aspnet/Microsoft.Data.Sqlite#255 for more details. We'll keep that issue up-to-date as Xamarin lights up.