需要有关使用 Entity Framework 4.1 Code First 和基本类型进行模型设计的建议
我需要一些关于我正在设计的模型的部分建议。正如您在我的 Rfi 实体中看到的，我有一个 BaseImpact 类型的集合。可以将多种类型的影响添加到该集合中。每种影响类型都有其自己的属性。作为示例，我创建了成本影响和进度影响。现在，这些并没有太大的不同，但你明白了。我试图弄清楚如何使用相同类型的模型，然后将映射/关系添加到数据库中。我真的希望 BaseImpact 是抽象的，但我可能需要它位于数据库中，但我不是用户。
public class Rfi
{
public ICollection<BaseImpact> Impacts { get; set; }
}
public class BaseImpact : BaseEntity
{
#region Navigation
public virtual ICollection<Comment> Comments { get; set; }
#endregion
}
public class CostImapct: BaseImpact
{
public decimal Cost { get; set; }
}
public class ScheduleImpact: BaseImpact
{
public int days { get; set; }
}
I need some advice on part of my model I am designing. As you can see in my Rfi entity, I have a collection of BaseImpact types. There will be several types of impacts that can be added to that collection. Each impact type has its own properties. As an example I created a Cost Impact and a Schedule Impact. Now, these are not very different, but you get the idea. I am trying to figure out how I can use this same type of model and then add the mappings / relationships to the database. I'd really like the BaseImpact to be abstract, but I may need it to be in the DB, but I am not usre.
public class Rfi
{
public ICollection<BaseImpact> Impacts { get; set; }
}
public class BaseImpact : BaseEntity
{
#region Navigation
public virtual ICollection<Comment> Comments { get; set; }
#endregion
}
public class CostImapct: BaseImpact
{
public decimal Cost { get; set; }
}
public class ScheduleImpact: BaseImpact
{
public int days { get; set; }
}
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参见这个 系列 帖子介绍了在 EF Code First 中对继承层次结构进行建模的不同选项。
See this series of posts on different options for modeling inheritance hierarchies in EF Code First.