Question

我试图将AdventureWorks 2012示例数据库映射到EF 6.1.3代码优先数据层，并坚持如何映射Employee和Person实体。员工显然应该来自Person，Person.PersonType EM，但我不知道如何使用EntityTypeConfiguration<TEntity>＆＃39;映射＆＃39来映射;类。知道了这一点，我也可以将Person映射到BusinessEntity。

Answer 1

我将解释如何使用Code First方法在Employee和Person表之间执行映射，您可以按照相同的过程来映射BusinessEntity和{{1}之间的继承}}

使用的继承映射策略是TPT（Table Per Type），我创建了一个简单的控制台应用程序，在安装了AdventureWorks2012数据库的情况下，我按照EF DataModel向导生成了代码，我将修改这些代码来映射继承，所以这是结果代码：

Person类：

Person

员工类：

public  partial class Person
{
    [Key]
    public int BusinessEntityID { get; set; }

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

    public bool NameStyle { get; set; }

    public string Title { get; set; }

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

    public string MiddleName { get; set; }

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

    public string Suffix { get; set; }

    public int EmailPromotion { get; set; }

    [Column(TypeName = "xml")]
    public string AdditionalContactInfo { get; set; }

    [Column(TypeName = "xml")]
    public string Demographics { get; set; }

}

最后是AW上下文类：

 public partial class Employee: Person
{

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

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

    [DatabaseGenerated(DatabaseGeneratedOption.Computed)]
    public short? OrganizationLevel { get; set; }

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

    [Column(TypeName = "date")]
    public DateTime BirthDate { get; set; }

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

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

    [Column(TypeName = "date")]
    public DateTime HireDate { get; set; }

    public bool SalariedFlag { get; set; }

    public short VacationHours { get; set; }

    public short SickLeaveHours { get; set; }

    public bool CurrentFlag { get; set; }

    public Guid rowguid { get; set; }

    public DateTime ModifiedDate { get; set; }
}

一个简单的测试（对我有用;））：

 public partial class AW : DbContext
{
    public AW()
        : base("name=AWConnectionString")
    {
    }

    public virtual DbSet<Employee> Employees { get; set; }

    public virtual DbSet<Person> People { get; set; }


    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {            
        modelBuilder.Entity<Person>().ToTable("Person.Person");
        modelBuilder.Entity<Employee>().ToTable("HumanResources.Employee");
    }
}

您可以参考this文章了解更多详情

如何在EF代码中映射继承的实体

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