Entity framework 将TPT继承的代码优先模型添加到Linq Fluent API

我在将Fluent API扩展到继承类时遇到问题。我采用了TPT（每种类型的表）方法，并且每种类型的继承都有一个表。我喜欢每种类型的表，因为数据库完全规范化并且易于维护。我没有让继承的模型

ServiceCompany

使用Fluent API

var ListofServiceCompanies = db.ServiceCompanies.All()

基抽象类

public abstract class Vendor
{
    [Key]
    public int VendorID { get; set; }

    [Required]
    public string CompanyName { get; set; }

    [Required]
    public int StreetNumber { get; set; }

    [Required]
    public string StreetName { get; set; }
}

从供应商继承的ServiceCompany类

[Table("ServiceCompanies")]
public class ServiceCompany : Vendor
{
    public string ACHClaim { get; set; }

    public virtual ICollection<SubContractorCompany> SubContractorCompanies { get; set; }

    public virtual ICollection<ServiceCompanyUser> SubContractorUsers { get; set; }
}

而不是像这样

var ListofServiceCompanies = db.Vendor.SelectMany( Vendor is a ServiceComapny...etc)

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我更喜欢正确地设置实体，并使代码美观且易于使用。非常感谢您的洞察力和知识。

您可以通过调用如下扩展方法来实现这一点：

var ListofServiceCompanies = db.Vendor.OfType<Vendor>().ToList();

然后打电话：

var ListofServiceCompanies = db.ServiceCompanies.ToList();

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关于为TPT（每种类型的表）继承设置Fluent API的详细说明

public class ApplicationDbContext : IdentityDbContext<ApplicationUser>
{
     public ApplicationDbContext()
        : base("DefaultConnection", throwIfV1Schema: false)
    {
    }

    public DbSet<Vendor> Vendors { get; set; }

    public DbSet<ServiceCompany> ServiceCompanies { get; set; }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        base.OnModelCreating(modelBuilder);
        modelBuilder.Entity<ServiceCompany>().ToTable("ServiceCompanies");
    }

    public static ApplicationDbContext Create()
    {
        return new ApplicationDbContext();
    }
}

var ListofServiceCompanies = db.ServiceCompanies.ToList();