MyDarling/Models/MyDarlingRepository.cs

using Microsoft.EntityFrameworkCore;

namespace MyDarling.Models
{
    public class MyDarlingRepository : IRepository
    {
        private DataContext DbContext { get; }
        public MyDarlingRepository(IServiceProvider provider)
        {
            DbContext = provider.CreateScope().ServiceProvider.GetRequiredService<DataContext>();
        }

        public IQueryable<UnderwearBundle> Bundles => DbContext.UnderwearBundles.Include(b => b.Figures);

        public void Add(UnderwearBundle b)
        {
            DbContext.UnderwearBundles.Add(b);
            DbContext.SaveChanges();
        }

        public void Remove(UnderwearBundle b)
        {
            DbContext.UnderwearBundles.Remove(b);
            DbContext.SaveChanges();
        }

        public void Save()
        {
            DbContext.SaveChanges();
        }
    }
}