实体框架 6 &TPH继承:默认将同名属性映射到同一列

Entity Framework 6 amp; TPH inheritance: Map properties with the same name to same column by default(实体框架 6 amp;TPH继承:默认将同名属性映射到同一列)

问题描述

从 EF6 开始，可以在使用 Table Per Hierarchy 继承配置实体映射时执行以下操作:

As of EF6 it is possible to do something like this when configuring Entity mappings using Table Per Hierarchy inheritance:

public class MyContext : DbContext 
{
    public DbSet<Device> Devices { get; set; }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Entity<ABatteryPoweredDevice>().Property(c => c.BatteryLevel).HasColumnName("BatteryLevel");
        modelBuilder.Entity<ADifferentBatteryPoweredDevice>().Property(c => c.BatteryLevel).HasColumnName("BatteryLevel");
    }
}

BatteryLevel 不是 Device 基类的一部分 - 它是实现接口契约的派生类的属性.

BatteryLevel is not part of the Device base class- it is a property of the derived classes implemented to fulfill an interface contract.

是否可以将此设置为默认行为，而不必为每个派生类添加新映射?

Is it possible to make this the default behavior as opposed to having to add a new mapping for each derived class?

推荐答案

使用 自定义代码优先约定，从 EF6 开始提供，来解决这个问题:

Used Custom Code First Conventions, which are available from EF6 onwards, to sort this out:

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        //your code before
        modelBuilder.Properties().Configure(prop => prop.HasColumnName(prop.ClrPropertyInfo.Name));
        //your code after
    }

这会将不同派生类型中具有相同名称的属性映射到同一个表列，而无需像问题中提到的那样显式调用.

This maps properties with the same name in different derived types to the same table column without explicit calls like those mentioned in the question.

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