Duplicate AssemblyVersion Attribute

Question

I have a project that generates following error on compilation:

error CS0579: Duplicate \'AssemblyVersion\' attribute

I have che

Answer 1

I have also run into this issue in the past, so I am going to assume that your build process provides assembly information separately to providing versioning. And that causes a duplication as your project also has that info in the AssemblyInfo.cs file. So remove the file and I think it should work.

Answer 2

In my case, some temporary *.cs files generated during compilation got accidentally added to the project.

The files were from the obj\Debug directory, so they definitely shouldn't have been added to the solution. A *.cs wildcard went a little crazy and added them incorrectly.

Deleting these files fixed the problem.

Answer 3

This issue is a reference conflict which is mostly peculiar to VS 2017.

I solved this same error by simply commenting out lines 7 -14 as well as Assembly version codes at the bottom of the page on AssemblyInfo.cs

It removed all the duplicate references and the project was able to build again.

Answer 4

I had to delete the whole repo and clone a fresh copy to get it to work.

I tried deleting all the files mentioned above but it didn't work.

Answer 5

In my case, there where a subfolder in a project that was a project folder it self:

• file system:

  • c:\projects\webapi\wepapi.csproj
  • c:\projects\webapi\tests\wepapitests.csproj

• solution

  • webapi (folder and project)
    • tests (folder)
  • tests (folder and project)

Then i had to remove the subfolder "tests" from the "webapi" project.

Answer 6

Yet another solution when upgrading core to VS2017 is to remove them in the properties\assemblyinfo.cs file.

Since they now are stored in the project.