EntityFramework Code使用自定义鉴别器进行第一次继承 [英] EntityFramework Code First inheritance with custom discriminator
问题描述
我正在尝试在EntityFramework代码中映射以下继承
I'm trying to map the following inheritance in EntityFramework Code First
public class Member
{
public string ProjectName { get; set; }
public string AssemblyName { get; set; }
public string NamespaceName { get; set; }
public string TypeName { get; set; }
public string Signature { get; set; }
public string DisplayName { get; set; }
public MemberType Type { get; set; }
public string Summary { get; set; }
public bool IsStatic { get; set; }
public bool IsInherited { get; set; }
//public virtual Type ParentType { get; set; } // ignore this
}
public class Field : Member
{
public string ValueType { get; set; }
public bool IsReadOnly { get; set; }
public bool IsVolatile { get; set; }
}
public enum MemberType
{
Constructor,
Field,
Method,
Operator,
Property
}
正如您可以从代码中猜到的那样,我计划添加成员的更多子类(名为构造函数,方法,运算符和属性),但首先我想让Field一个正常工作。
As you can probably guess from the code, in time I plan to add more subclasses of Member (named Constructor, Method, Operator and Property), but first I'd just like to get the Field one to work properly.
我的映射代码看起来像这样
My mapping-code looks like this
modelBuilder.Entities<Member>().Configure(config =>
{
config.HasKey(m => new { m.ProjectName, m.AssemblyName, m.NamespaceName, m.TypeName, m.Signature });
config.Property(m => m.DisplayName).IsRequired();
config.ToTable("Members");
});
modelBuilder.Entities<Field>().Configure(config =>
{
config.HasKey(f => new { f.ProjectName, f.AssemblyName, f.NamespaceName, f.TypeName, f.Signature });
});
modelBuilder.Entity<Member>()
.Map<Field>(m =>
{
m.ToTable("Fields");
m.Requires("Type").HasValue((int)Service.DataTypes.MemberType.Field).IsRequired();
}); // note: realy not certain about this one
我想要的是生成两个表。一个名为成员,一个名为Fields,并在成员 -class中使用
类型
-property作为一个歧视者,我相信我只是在这里做一些非常愚蠢的事情,但是我无法为我的生活找出如何做到这一点。因为使用当前的代码,它会在Fields表格中生成一个名为Type的列,您显然不需要这个列,因为这是一个常数。
What I would like, is to generate two tables. One named "Members", and one named "Fields", and use the Type
-property in the Member
-class as a discriminator, and I'm sure I'm just doing something really stupid here, but I cannot for the life of me figure out how to do it. Because with the current code, it generates a column in the "Fields" table named "Type", which you obviously wouldn't need as that'd be a constant.
所以我只是想知道,有人可以告诉我,我做错了什么?
So I'm just wondering, could somebody please tell me what on earth I'm doing wrong?
推荐答案
有没有打字错误?你的类有一个字段Valuetype Not Type。
Is there a typo there ? Your Class has a field Valuetype Not Type.
我从来没有尝试过使用JUST 1映射,尝试用第二个表来确保。
I have never tried with with JUST 1 mapping, try with a second table to make sure.
modelBuilder.Entity<Member>()
.Map<Field>(m =>
{
m.ToTable("Fields");
m.Requires("ValueType").HasValue((int)Service.DataTypes.MemberType.Field).IsRequired();
})
.Map<SECONDTYPE>(m =>
{
m.Requires("ValueType").HasValue(42);
});
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