Home/ Questions/Q 6075203
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-23T10:28:06+00:00

I have a T4 template to generate C# classes for the entities backing my

  • 0

I have a T4 template to generate C# classes for the entities backing my .edmx model. The template starts with this header:

<#@ template language="C#" debug="false" hostspecific="true"#>
<#@ include file="EF.Utility.CS.ttinclude"#>
<#@ output extension=".cs"#>

Attempting to build the project results in these errors

error CS0234: The type or namespace name 'Design' does not exist in the namespace 'System.Data.Entity'...
error CS0246: The type or namespace name 'EnvDTE' could not be found (are you missing a using directive...
error CS0234: The type or namespace name 'VisualStudio' does not exist in the namespace 'Microsoft'...

How can I fix this?

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    It turns out than, based on a VS Extensibility thread, the reason for the problem was
    the Clarius Visual T4 extension. It reset this node in the .csproj
    file to

    <Compile Include="SomeModel.tt">
  <Generator>TextTemplatingFileGenerator</Generator>
  <LastGenOutput>SomeModel.cs</LastGenOutput>
</Compile>

    from

    <None Include="SomeModel.tt">
  <Generator>TextTemplatingFileGenerator</Generator>
  <LastGenOutput>SomeModel.cs</LastGenOutput>
</None>

    The solution is to manually change the node to None in the .csproj file. Changing it
    back via the Visual Studio properties editor for the .tt file does not work.
    Finally, disabling the extension prevents this from happening again.

    • 0