blocks|key|2911768|text|找到解决方案。在某些情况下(随机地)，由entity+framework生成的代码中出现了混淆。这显然是一个已知的错误，在未来的版本中应该会有一个修复。同时，解决方法是将efm移到解决方案中的单独类中。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2911769|entityMap^0|K|G|2D|3|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

Solution found. It appears in some cases (randomly) there is a mix up in the code generated by the <code>entity framework</code>. This is apparently a known bug and a fix should be coming in future releases. In the mean time the way around this is to move the <code>efm</code> to a separate class within the solution.

blocks|key|3126098|text|我刚刚安装了EF4.1，并试图将DbContext与EMDX结合起来--当我试图传回一个视图时，我得到了同样的错误--这就是为什么我最终来到了这里……我认为解决这一问题的方法是在解决方案中将功能分离到单独的asemblies中。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3126099|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Well I just installed EF 4.1 and tried to combine DbContext with a EMDX - When I tried to pass back a view I got the same error - that's why I ended up here... I think the way around this is to separate the functionality out into separate asemblies in the solution...

blocks|key|3126110|text|使用Visual+Studio+12，该问题仍未得到解决。作为一种替代的解决方法，我使用早于实体模型的“老式”数据类设置了第二个SQL数据模型-它们仍然存在并且仍然有效。使用Add+-+New+Item+-+(Data+Category)+-+LINQ+To+SQL+Classes，打开ServerExplorer，找到服务器和数据库，然后将其拖放到data+classes窗格中。老派-但当不需要实体模型的全部功能时，它很方便地克服了这个非常不方便的问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3126111|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Using Visual Studio 12, the issue has still not been resolved. As an alternative workaround, I set up the second SQL data model using "old fashioned" Data Classes that pre-date entity models - they're still there and they still work. Use Add - New Item - (Data Category) - LINQ To SQL Classes, open the ServerExplorer, locate the server and database, then drag and drop it onto the data classes pane. Old school - but conveniently overcomes this highly inconvenient issue when the full functionality of entity models is not needed.

blocks|key|3126125|text|通过将EntityFramework更新到最新版本(6.0)+http://nuget.org/packages/EntityFramework/解决了此问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3126126|安装后，重新生成模型，它将正常工作;)|3126127|entityMap|0|LINK|mutability|MUTABLE|url|http://nuget.org/packages/EntityFramework/^0|V|16|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]]|C|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]]]

Solved this by updating EntityFramework to the latest version (6.0)
<a href="http://nuget.org/packages/EntityFramework/">http://nuget.org/packages/EntityFramework/</a>.

After installing it regenerate the models and it will work ;)

blocks|key|243997|text|我删除了edmx模型，删除了实体包，重新安装了Entity+5.0并正常工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|243998|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I removed the edmx models, removed the Entity package, re-install the entity 5.0 and works.

blocks|key|242659|text|一种可能的解释是，如果您先使用数据库方法，而忘记添加实体类，则会出现此错误。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|242660|即(来自下面链接的指南)|242661|242662|右键单击模型的设计器图面。|ordered-list-item|242663|从上下文菜单中选择添加代码生成项。|242664|在打开的添加新项对话框中，从左侧已安装的模板类型列表中选择数据。|242665|选择ADO.NET+DbContext生成器，然后单击添加按钮。|242666|<+Code+>G29|242667|我通常使用朱莉·勒曼的指南；https://msdn.microsoft.com/en-us/library/jj206878(v=vs.113).aspx|offset|length|242668|entityMap|0|LINK|mutability|MUTABLE|url|https://msdn.microsoft.com/en-us/library/jj206878(v=vs.113).aspx^0|0|0|0|0|0|0|0|0|E|1S|0|0^^$0|@$1|2|3|4|5|6|7|11|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|12|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|13|8|@]|9|@]|A|$]]|$1|E|3|F|5|G|7|14|8|@]|9|@]|A|$]]|$1|H|3|I|5|G|7|15|8|@]|9|@]|A|$]]|$1|J|3|K|5|G|7|16|8|@]|9|@]|A|$]]|$1|L|3|M|5|G|7|17|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|18|8|@]|9|@]|A|$]]|$1|P|3|Q|5|6|7|19|8|@]|9|@$R|1A|S|1B|1|1C]]|A|$]]|$1|T|3|-4|5|6|7|1D|8|@]|9|@]|A|$]]]|U|$V|$5|W|X|Y|A|$Z|10]]]]

One possible explanation is that if you use the database first approach and forget to add the Entity classes, you will get this error.

i.e. (from the guide linked below)

<ol>
<li>Right click on the model’s designer surface.</li>
<li>From the context menu, choose Add Code Generation Item.</li>
<li>In the Add New Item dialog that opens, select Data from the list of installed templates types on the left.</li>
<li>Choose the ADO.NET DbContext Generator then click the Add
button.</li>
</ol>

I normally use Julie Lerman's guide; <a href="https://msdn.microsoft.com/en-us/library/jj206878(v=vs.113).aspx" rel="nofollow noreferrer">https://msdn.microsoft.com/en-us/library/jj206878(v=vs.113).aspx</a>

blocks|key|242673|text|我在同一个项目中使用两个不同的.edmx文件时也遇到了同样的问题。对于第一个.edmx+model，我使用了"Add+Code+Generation+Item"，对于第二个模型，我没有使用，项目构建正确，但是在运行时抛出了异常。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|242674|我还解决了为第二个.edmx+model生成.tt类的问题。|242675|entityMap^0|F|5|12|B|1I|Q|0|9|B|M|3|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]|$9|M|A|N|B|C]|$9|O|A|P|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Q|8|@$9|R|A|S|B|C]|$9|T|A|U|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|I|$]]

I had the same problem with 2 different <code>.edmx</code> files in the same project.
For the first <code>.edmx model</code> I had used <code>"Add Code Generation Item"</code>, for the second model I hadn't. The project was building correctly but throwing that exception on runtime.

I solved generating the <code>.tt</code> classes for the second <code>.edmx model</code> as well.

blocks|key|3126230|text|这也可以通过在visual+studio+2010中生成新的edmx来解决，这样它就可以与旧的edmx匹配。(并复制它生成的文件)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3126231|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

This can also be resolved by generating the new edmx in visual studio 2010 so it matches the older ones... (And copying over the files it generates)

blocks|key|2911983|text|我正在使用一些遗留软件，并不热衷于升级EF。对我来说，需要更改新添加的.edmx上的以下设置，以匹配项目中已存在的.edmx。我的新版本显示为"T4“，我将其更改为"Legacy+Object+Context”。我确实必须删除之前生成的.tt模板，以便构建它。否则，旧生成的文件会留在那里，新文件也会留在那里，从而导致“属性已定义”错误。感谢上面所有帮助我解决这个问题的答案！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2911984|(属性面板，在实体设计器中单击后)|2911985|📷|atomic|offset|length|2911986|​|2911987|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/ce705a925c9b6b393ea0636c6009e586.png|imageAlt^0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|U|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|V|8|@]|9|@$G|W|H|X|1|Y]]|A|$]]|$1|I|3|J|5|6|7|Z|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|10|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R|S|-4]]]]

I was working with some legacy software and was not keen on upgrading EF. For me, the below setting on my newly added .edmx needed to be changed to match the .edmx that already existed in the project. My new one said &quot;T4&quot; and I changed it to &quot;Legacy Object Context&quot;. I did have to delete the .tt templates that were generated previously in order to get it to build. Otherwise, the old generated files stay there and the new files are also there, causing &quot;property already defined&quot; errors. Thx to all the answers above that helped me figure this out!
(Properties panel, after clicking in the entity designer)
<a href="https://i.stack.imgur.com/i7DgN.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/i7DgN.png" alt="Code Generation Strategy in Properties" /></a>

I have two Entity Data models within a MVC3 project A and B.

I have recently added the new entity data model B to deal with some new functionality, the issue is that now the existing code has stopped working and I am getting the following error when trying to access code within entity model A.

The error message is: 

<blockquote>
 Could not find the conceptual model type 'project.models.Bclass'
</blockquote>

I do not understand why it is this new functionality has affected the current code seeing as entity model A has not change in any way. And functionality B is in a separate class and does not interfere with model A.

When the new code is removed from the project and entity model B is excluded then the code works as it should.

Here is some of the stacktrace from the error:

<pre><code>Exception : Could not find the conceptual model type for 'Project1.Models.CrossSession'.
Application Class - method : System.Data.Metadata.Edm.MetadataWorkspace -- GetEdmSpaceType
User : temp.user
Url : http://localhost/project1/auth/message
Stacktrace : at System.Data.Metadata.Edm.MetadataWorkspace.GetEdmSpaceType(StructuralType objectSpaceType)
 at System.Data.Entity.Internal.InternalContext.UpdateEntitySetMappings()
 at System.Data.Entity.Internal.InternalContext.TryUpdateEntitySetMappingsForType(Type entityType)
 at System.Data.Entity.Internal.InternalContext.GetEntitySetAndBaseTypeForType(Type entityType)
 at System.Data.Entity.Internal.Linq.InternalSet`1.Initialize()
 at System.Data.Entity.Internal.Linq.InternalSet`1.get_InternalContext()
</code></pre>

Could not find the conceptual model type

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我在MVC3项目A和B中有两个实体数据模型。我最近添加了新的实体数据模型B来处理一些新的功能，问题是现在现有的代码已经停止工作，当我试图访问实体模型A中的代码时，我得到了以下错误。错误消息为：找不到概念模型类型'project.models.Bclass‘我不明白为什么这个新功能会影响当前的代码，因为实体模型A没有以任...

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