类型定义存在于两个库 [英] Type definition exists in two libraries

问题描述

我建立一个ASP.NET Web窗体使用.NET 4.5的网站。

I am building an ASP.NET Web Forms web site using .NET 4.5.

错误...

The type 'System.ComponentModel.DataAnnotations.Schema.ForeignKeyAttribute' exists in both 'f:\Projects\web sites\RC1Iteration05\packages\EntityFramework.5.0.0\lib\net40\EntityFramework.dll' and 'c:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.5\System.ComponentModel.DataAnnotations.dll'

我曾尝试使用别名库...

I have tried to alias the libraries using ...

csc /r:EF_DataAnnotations="f:\Projects\web sites\RC1Iteration05\packages\EntityFramework.5.0.0\lib\net40\EntityFramework.dll" /r:CM_DataAnnotations="c:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.5\System.ComponentModel.DataAnnotations.dll"

但这只是导致未指定源文件，因为按照指示（的这里和放大器; 这里）。

我也注意到，错误是引用了net40文件夹，而不是net45文件夹中的EF DLL。我想如果我用了net45的版本问题会自行解决，但我不知道该如何改变这种状况的参考。我改变了targetFramework属性到的EntityFramework包中的文件packages.config，但没有任何区别。

I did notice that the error was referencing the EF dll in the net40 folder rather than the net45 folder. I figure if I used the net45 version the problem would resolve itself, however I do not know how to change that reference. I changed the "targetFramework" attribute to the EntityFramework package in the packages.config file, but that did not make any difference.

我有点由于两个方案的卡似乎并没有做任何事情。

I am a bit stuck since both of the solutions did not seem to do anything.

我环顾四周，发现了一些在这里的帖子，其中乡亲处理类似的问题，但没有收到任何回应。我希望有一个人在那里谁可以帮助！

I looked around and found a number of posts here where folks have dealt with similar issues but have received no responses. I am hoping that there is someone out there who can help!

感谢

摹

推荐答案

当你发现，你正在使用的.NET 4.5的.NET 4.0版本的实体框架。结果
这是行不通的。

As you noticed, you're using the .Net 4.0 version of Entity Framework on .Net 4.5.
That won't work.

从的NuGet重新安装EF，它应该工作正常。

Re-install EF from NuGet and it should work fine.

这篇关于类型定义存在于两个库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！