How can I resolve this error: Loading the include file 'EF.Utility.CS.ttinclude' returned a null or empty string

问题:

How can I resolve these errors:

1. Loading the include file 'EF.Utility.CS.ttinclude' returned a null or empty string.
2. Value does not fall within the expected range.

Tools Used: VS 2012, Entity Framework 5.0.0, T4MVCExtensions 3.5.0, .NET Framework 4.5

I've been using EF and T4 templates in a project within a large MVC solution without incident. Now, when I right-click on the edmx diagram, EF responds with the message: Value does not fall within the expected range. When I compile the EF project it responds with these messages:

1. Loading the include file 'EF.Utility.CS.ttinclude' returned a null or empty string. The transformation will not be run. C:\Projects\NSAForms\NSAForms\NSAFormsEDM\NSAFormsEntities.tt
2. Failed to resolve include text for file:C:\Projects\NSAForms\NSAForms\NSAFormsEDM\EF.Utility.CS.ttinclude C:\Projects\NSAForms\NSAForms\NSAFormsEDM\NSAFormsEntities.tt

Every table in the database has a primary key. I'm struck by how suddenly this issue appeared. Does anyone have some suggestions how to resolve this issue?

Thanks in advance,

Arnold

回答1:

In VS 2012, the EF.Utility.CS.ttinclude file will only be installed if the Microsoft Web Developer Tools or Microsoft SQL Server Data Tools component is selected.

回答2:

I had very similar issue and I tried with VS2012 and VS2013.

After reinstalling Entity Framework 6 Tools for Visual Studio 2012 http://www.microsoft.com/en-us/download/confirmation.aspx?id=40762 every thing went back to normal.

回答3:

Reinstalling Entity Framework 6 Tools for Visual Studio 2012 http://www.microsoft.com/en-us/download/confirmation.aspx?id=40762 work for me

回答4:

Visual Studio 2017

was getting the same error but only in a test project. after reviewing the test project and the other project successfully referencing that file i found that adding the following to the app.config of the failing project resolved my issue

  <configSections>     <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->     <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />   </configSections>   <entityFramework>     <defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">       <parameters>         <parameter value="mssqllocaldb" />       </parameters>     </defaultConnectionFactory>   <connectionStrings> 

回答5:

Had this issue with a recent install of VS2017 Enterprise after already having this functionality working in Professional.
The solution for me was to:

1. Open the Visual Studio Installer program and "Modify" my Enterprise installation.
2. Select "ASP.NET and web development" under the Web & Cloud section
3. Click "Modify" in bottom right

It's probably worth noting that I already had EF6 installed and did not need to re-install it to get this to work.

After completing those steps and firing up Visual Studio, the error went away and I was able to generate my classes successfully. Hope this helps!

回答6:

For VS2017, I ended up adding EF6.Utility.CS.ttinclude to model's folder. This resolved my issue with MySql and EF.

File can be found: C:\Program Files (x86)\Microsoft Visual Studio 14.0\Common7\IDE\Extensions\Microsoft\Entity Framework Tools\Templates\Includes\EF6.Utility.CS.ttinclude

UPDATE To avoid doing the above, removing the entities completely then adding back in fixed the issue.

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