对于EntityType错误，找不到EF映射和元数​​据信息 [英] EF Mapping and metadata information could not be found for EntityType Error

问题描述

当我使用Entity Framework 4.0 RC时遇到异常。
我的实体框架模型封装在一个私人程序集中，名字是Procurement.EFDataProvider，我的POCO类在另一个程序集中Procurement.Core
Core（Business Logic）和EFDataProvider（Data Access）之间的关系有一个名为DataProvider的工厂

I have encountered an exception when I use Entity Framework 4.0 RC. My Entity Framework model is encapsulated in a private assembly who's name is Procurement.EFDataProvider and my POCO classes are inside of another assembly Procurement.Core The relation between Core(Business Logic)and EFDataProvider(Data Access) is with a factory named DataProvider

所以当我尝试创建一个对象集

so when I try to create an objectset

objectSet = ObjectContext.CreateObjectSet<TEntity>();

我收到错误：

找不到EntityTypeProcurement.Core.Entities.OrganizationChart的映射和元数​​据信息。

Mapping and metadata information could not be found for EntityType 'Procurement.Core.Entities.OrganizationChart'.

推荐答案

对于处理错误的任何人，我认为值得一提的是我发现导致这个（非常无益）错误的一些场景：

For anyone else dealing with the error, I think it's worth mentioning some scenarios that I've found that cause this (extremely unhelpful) error:

• 拼写错误的属性（区分大小写！）


• POCO类中缺少属性


• POCO和实体类型（例如，int而不是long）


• 枚举在POCO中（EF根据我的理解现在不支持枚举）

• Misspelled properties (case-sensitive!)
• Properties missing in the POCO class
• Type mismatches between the POCO and entity-type (e.g., int instead of long)
• Enums in the POCO (EF doesn't support enums right now as I understand)

可能还有其他原因。

HTH

这篇关于对于EntityType错误，找不到EF映射和元数​​据信息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！