c# - 使用 EntityTypeConfiguration 时的抽象域模型基类

Question

获取 Base 对象属性的集中映射是否有一些技巧？使用 EntityTypeConfiguration 时是否有一些抽象类的简单模式。
非常感谢任何提示。我无法声明一个类

Public class BaseEntityConfig<T> : EntityTypeConfiguration<T>

类似的问题，我无法得到工作的答案 How to create and use a generic class EntityTypeConfiguration<TEntity>和 Dynamic way to Generate EntityTypeConfiguration : The type 'TResult' must be a non-nullable value type

public  abstract class BosBaseObject
{
  public virtual Guid Id { set; get; }
  public virtual string ExternalKey { set; get; }
  public byte[] RowVersion { get; set; }
}
  public class News : BosBaseObject
{
    public String Heading { set; get; }
}


public class NewsMap : EntityTypeConfiguration<News>
{
    public NewsMap()
    {
      //Base Object Common Mappings
      // How can we use a central mapping for all Base Abstract properties  


     }
 }
// Something like this but very open to any suggestion....
public class BosBaseEntityConfig<T> : EntityTypeConfiguration<T>
{
  public void BaseObjectMap( )
    { 
        // Primary Key
        this.HasKey(t => t.Id);

        // Properties
        this.Property(t => t.Id).HasDatabaseGeneratedOption(databaseGeneratedOption: DatabaseGeneratedOption.None);

        this.Property(t => t.RowVersion)
            .IsRequired()
            .IsFixedLength()
            .HasMaxLength(8)
            .IsRowVersion();

        //Column Mappings
        this.Property(t => t.Id).HasColumnName("Id");
    }
}

Answer 1

上面的答案肯定有效，尽管这可能更清晰一些，并且在 DbContext 中注册配置时具有相同的工作原理。

public abstract class BaseEntity
{
    public int Id { get; set; }
}

public class Company : BaseEntity
{
    public string Name { get; set; }
}

internal class BaseEntityMap<T> : EntityTypeConfiguration<T> where T : BaseEntity
{
    public BaseEntityMap()
    {
        // Primary Key
        HasKey(t => t.Id);
    }
}

internal class CompanyMap : BaseEntityMap<Company>
{
    public CompanyMap()
    {
        // Properties
        Property(t => t.Name)
            .IsRequired()
            .HasMaxLength(256);
    }
}

public class AcmeContext : DbContext
{
    public DbSet<Company> Companies { get; set; }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Configurations.Add(new CompanyMap());
    }
}

上述解决方案是 Christian Williams 和我在一天清晨得出的......