EF Core 2.1.1 种子数据不适用于 override double

Question

你能告诉我为什么在我的数据库中我在 Seed method 之后得到 0 值吗？这是它的样子：

public static void Seed(this ModelBuilder modelBuilder)
    {
        int countOfWorkers = 10;

        for (int i = 0; i < countOfWorkers; i++)
        {
            modelBuilder.Entity<Driver>().HasData(
            new Driver
            {
                // 10 same workers
                Id = i + 1,
                FarmId = 1,
                FirstName = "name" + i,
                LastName = "lastname" + i,
                UsdPerHour = 7.2,
                HoursPerDay = 8,
                DaysOfWork = 31
            });
        }
    }

还有我的Models类:

public abstract class Worker
{
    [Key]
    public int Id { get; set; }

    [ForeignKey("Farm")]
    public int FarmId { get; set; }
    public Farm Farm { get; set; }

    public string FirstName { get; set; }
    public string LastName { get; set; }

    public virtual double UsdPerHour { get; set; }
    public virtual int HoursPerDay { get; set; }
    public virtual int DaysOfWork { get; set; }

    public virtual double CountBaseSalary() => throw new NotImplementedException();
}

public class Driver : Worker
{
    public Driver() => BaseSalary = CountBaseSalary();

    public override double UsdPerHour { get; set; }
    public override int HoursPerDay { get; set; }
    public override int DaysOfWork { get; set; }

    public override double CountBaseSalary() => UsdPerHour* HoursPerDay *DaysOfWork;

}

我正在使用 EF Core 2.1.1。我做错了什么，我得到了 Driver 属性的 0's 值？如果需要，我可以添加更多信息。

我的DbContext:

public class FarmDbContext : DbContext
{
    public FarmDbContext(DbContextOptions<FarmDbContext> options) : base(options) { }

    public DbSet<Farm> Farms { get; set; }
    public DbSet<Worker> Workers { get; set; }

    protected override void OnModelCreating(ModelBuilder builder)
    {
        builder.Entity<Driver>();
        builder.Seed();
        base.OnModelCreating(builder);
    }
}

Answer 1

如果所有 Worker 都有 UsdPerHour, HoursPerDay, DaysOfWork 那么您不需要 Driver 中指定的那些字段，它们将被继承。

如果只有 Driver 需要这些字段，则应将它们从基础 class Worker 中删除。

EF Core 2.1.1 种子数据不适用于 override double

EF Core 2.1.1 Seed data not working with override double

c#

asp.net-core

entity-framework-core

seeding