代码优先 - 将实体的字段映射到同一列 [英] Code-first - Mapping entities' fields to the same column

问题描述

使用Model-first和Table-per-heirachy，我可以创建两个继承自同一基类的类，并将两个派生类中的每一个中的列映射到同一个表列，这样我就可以'重复使用'列。

Using Model-first and Table-per-heirachy, I can create two classes that inherit from the same base class, and map a column in each of the two derived classes to the same table column so that I can 're-use' columns.

如果我尝试使用Code-first，我会收到以下错误："类型中的每个属性名称必须是唯一的。已经定义了属性名称"XXX"。"

If I try that with Code-first, I get the following error: "Each property name in a type must be unique. Property name 'XXX' was already defined."

我认为这是代码优先的错误？

I assume that this is a bug in code-first?

以下是一些示例代码：

public class Parent
{
  public Guid Id { get; set; }
}
public class ChildA : Parent
{
  public Int32 ChildAProperty { get; set; }
}
public class ChildB : Parent
{
  public Int32 ChildBProperty { get; set; }
}
public class TestContext : DbContext
{
  public DbSet<Parent> Entities { get { return this.Set<Parent>(); } }

  protected override void OnModelCreating(ModelBuilder modelBuilder)
  {
    var childAConfig = modelBuilder.Entity<ChildA>();
    childAConfig.Property(p => p.ChildAProperty).HasColumnName("Property");
    var childBConfig = modelBuilder.Entity<ChildB>();
    childBConfig.Property(p => p.ChildBProperty).HasColumnName("Property");
  }
}

推荐答案

Hello Lee，

Hello Lee,

确实这看起来像个bug。我会把它归档并确保它不会丢失。谢谢你指出来了！

Indeed this looks like a bug. I'll file it and make sure it doesn't get lost. Thanks for pointing it out!

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