如何保存子实体中的EntityFramework 4？ [英] How do I save a child entity in EntityFramework 4?

问题描述

我的订单和联系之间的1-1的关系。即Contact.OrderId引用订单，也是一个PK。

所以，我有一个现有订单，并添加新的联系人，以它像这样...

  order.Contact =新联系（）{EmailAddress的=你好};
    context.Orders.Attach（订单）;
    context.SaveChanges（）;
 

  

一个参照完整性约束冲突发生了：定义参照约束的属性值是不是本金和依赖对象的关系之间是一致的。

。

那我做错了吗？

解决方案

刚刚产生的子实体，设置它的 OrderIdReference 属性，你应该是好去。

I have a 1-1 relationship between Orders and Contact. i.e. Contact.OrderId references Orders and is also a PK.

So I have an existing Order and I add a new Contact to it like so...

    order.Contact = new Contact() { EmailAddress = "hello" };
    context.Orders.Attach(order);
    context.SaveChanges();

A referential integrity constraint violation occurred: The property values that define the referential constraints are not consistent between principal and dependent objects in the relationship.

So what am I doing wrong?

解决方案

Just generate your child entity, set its OrderIdReference property and you should be good to go.

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