映射返回null引用 [英] Mapping return null reference
问题描述
请帮助!!!
我有从学校班级到地址(1-1)班级的映射这个:
I have mapping from School class to Address (1-1) class like this:
        MapSingleType(s => new
MapSingleType(s => new
{
{
school_id = s.ID,
school_id = s.ID,
name = s.Name,
name = s.Name,
address = s.Address.ID,
address = s.Address.ID,
})。ToTable(" dbo.School");
}).ToTable("dbo.School");
但是当我尝试解析学校实例(使用LINQ)时,Address属性为null,出了什么问题?
but when I try to resolve the school instance (with LINQ), the Address property is null, what is wrong ?
谢谢。
推荐答案
你好,
您是否设置了一对一关系? 如果没有,请参阅此相关主题,了解如何设置它, http://social.msdn.microsoft.com/Forums/en-US/adonetefx/thread/89db5f94-818d-42e6-b0c4-908a88300ecd/ 。
Have you set the one-to-one relationship? If not, please refer to this related thread about how to set it, http://social.msdn.microsoft.com/Forums/en-US/adonetefx/thread/89db5f94-818d-42e6-b0c4-908a88300ecd/.
最好的问候,b
Lingzhi Sun
Best Regards,
Lingzhi Sun
这篇关于映射返回null引用的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!