空的值的复杂类型

本文介绍了空的值的复杂类型的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

对于只可空性实体框架的复杂类型，这是为什么这样的事情如下要求复杂类型被实例化：

For a complex type in entity framework with only nullable properties, why is that for something like the following requires the complex type be instantiated:

[ComplexType] public class Address { public string Address1 { get; set; } } public class Customer { [Key] public int CustomerId {get;set;} public Address Address {get;set;} }

更具体地说，如果你不声明和地址类型，你会得到一个不可为空的会员会籍空值：'地址'。按照这个问题。

More specifically, if you don't declare and address type, you get a "Null value for non-nullable member. Member: 'Address'." As per this question.

只要在复杂类型的所有属性都是空的，那为什么实体框架需要地址的实例？由于地址1是空的，为何不能只是假设，并创建表中的行（和列Address_Address1）和空值，如果我创造了地址的实例，一个空地址1？

As long as all the properties in the complex type are nullable, why is it that entity framework requires an instance of Address? Since Address1 is nullable, why can it not just assume that and create the table (and column Address_Address1) and null value in the row as if I had created an instance of Address with a null Address1?

还是有我可以申请获得一个属性/流利的设置？

Or is there an attribute/fluent setting I can apply to achieve that?

推荐答案

即使属性是空的，包含它们的类不是。你可以有 Address.Address1 为空，但地址本身有被实例化。

Even if the properties are nullable, the class containing them isn't. You can have Address.Address1 as null, but Address itself has to be instantiated.