Question

我有一个抽象类Person。

public abstract class Person : Entity
{
    public string PassportFirstName { get; set; }
    public string PassportLastName { get; set; }
    public string InternationalFirstName { get; set; }
    public string InternationalLastName { get; set; }
    public PersonSocialIdentity SocialIdentity { get; set; }
    public PersonContactIdentity ContactIdentity { get; set; }

    public DateTime ? BirthDate { get; set; }

    protected Person()
    {

    }
}

来自Person的派生具体课程包括Employee和Student

public class Employee : Person
{
    public Employee() : base()
    {
    }
}

由继承链接的配置类：

public abstract class PrincipalEntityConfiguration<T>
    : EntityTypeConfiguration<T> where T : Entity
{
    protected PrincipalEntityConfiguration()
    {
        HasKey(p => p.Id);
        Property(p => p.Id).HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);
    }
}

public abstract class PersonConfiguration<T> : PrincipalEntityConfiguration<Person> where T : Person
{
    protected PersonConfiguration()
    {
        HasRequired(p=>p.ContactIdentity).WithRequiredPrincipal();
        HasRequired(p=>p.SocialIdentity).WithRequiredPrincipal();
    }
}

public class EmployeeConfiguration : PersonConfiguration<Employee>
{
    public EmployeeConfiguration()
    {
        ToTable("Employees");
    }
}

他们在上下文中被调用：

protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Configurations.Add(new EmployeeConfiguration());
        modelBuilder.Configurations.Add(new StudentConfiguration());
        base.OnModelCreating(modelBuilder);
    }

我得到了一个例外：

类型＆＃39; EMIS.Entities.Domain.University.Person＆＃39;的配置。已被添加。要引用现有配置，请使用Entity（）或ComplexType（）方法。

显然，它发生的原因是在上下文中有双重称为人员配置。我该如何解决这个问题？

Answer 1

使用EntityTypeConfiguration<Employee>代替PersonConfiguration<Employee>：

public class EmployeeConfiguration : EntityTypeConfiguration<Employee>
{
    public EmployeeConfiguration()
    {
       ToTable("Employees");
    }
}

实体框架继承配置出错

1 个答案: