每个System.ComponentModel.DataAnnotations属性的目的是什么？ [英] What is the purpose of each of the System.ComponentModel.DataAnnotations attributes?

问题描述

我想提出一个MVC 3应用程序使用实体框架4波苏斯。我想诠释我所有的实体的尽可能多的。我有一个问题，但是我无法找到每个属性的含义好的文档。有些是pretty的直线前进，如 [必需] 或 [StringLength（...）] 。有了这样属性[公会] 不过，我不是100％肯定。难道我把它放在一个导航属性​​？在一个外键的财产？只有在多对多的关系？为 thisKey 此对象或主键此对象中的外键？

I am making an MVC 3 application using entity framework 4 with POCOs. I want to annotate all my entitys as much as possible. I am having a problem however that I cannot find good documentation on the meaning of every attribute. Some are pretty straight forward, like [Required] or [StringLength(...)]. With attributes like [Association] however, I am not 100% sure. Do I put it on a navigation property? On a foreign key property? Only on many to many relations? Is thisKey the primary key of this object or the foreign key in this object?

我找不到任何很好的资源，其中列出了所有这些特性具有很好的解释和例子。

I cannot find any good resource which lists all these properties with a good explanation and examples.

有关协会，MSDN只是说：指定的实体成员重新presents数据关系，比如一个外键关系
和thisKey：对协会的thisKey侧键值的属性名称的逗号分隔的列表。

For association, MSDN just says:"Specifies that an entity member represents a data relationship, such as a foreign key relationship."
and "thisKey: A comma-separated list of the property names of the key values on the thisKey side of the association."

我得到一个答案，关于属性的一个更具体的问题：
协会：<一href="http://stackoverflow.com/questions/5389603/how-do-i-use-system-componentmodel-dataannotations-associationattribute">How我用System.ComponentModel.DataAnnotations.AssociationAttribute

I got an answer to a more specific question about one of the attributes:
Association: How do I use System.ComponentModel.DataAnnotations.AssociationAttribute

推荐答案

在AssociationAttribute做一个导航属性​​没有为实体框架code-第一。它可能看起来像它，但它确实创造了分贝只是EF的惯例为基础的逻辑。

The AssociationAttribute does nothing for entity framework code-first on a navigation property. It may seem like it does, but it's really just EF's convention-based logic for creating the db.

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