Can't add reference to project, Visual studio

Question

I have created a project container In Visual studio. In this container, I have added three projects: A class library, a ASP .NET MVC Application and a Unit Test application.

Now, Im trying to add references between this projects. When Im trying to add a reference to my class library from my .NET MVC Application, I get an error that says that the reference could not be added.

Why do I get this error? Why can't I add a reference from my class library, to my mvc application?

I had an issue similar to this when i accidentally added a portable testing class. Make sure .net targets are then same. — Spaceman, Oct 09 '15 at 06:49
@Spaceman: When Im trying to view the properties of my class library, I can't see the target framework for the class library. — Bryan, Oct 09 '15 at 06:51
@Bryan Are you trying add reference to the DLL or .csproject? — kamil-mrzyglod, Oct 09 '15 at 07:19
To see the target framework, right click on the project >> Properties >> Application tab >> target framework. Anyway what error you are getting exactly?. — Yogi, Oct 09 '15 at 08:31
@Yogi: A reference to 'SportsStore.domain' could not be added — Bryan, Oct 09 '15 at 08:51
Mus I copy any dll-files? The type of class library that I add to my project Is a Class Library (Package) — Bryan, Oct 09 '15 at 09:52

score 1 · Answer 1 · edited May 23 '17 at 11:54

For future reference you really need to tell the versions on what you're using : Visual Studio?, ASP.NET MVC?, and .net Framework? as Ufuk mentioned. I'll assume you mean ASP.NET 5 vNext, as I know this has an issue.

Firstly, look at other posts: Issue adding reference to class library project in ASP.NET 5 (Core)

And secondly, if it's similar to what I experienced, there appears to be a bug in the beta7, so try adding a file reference: https://stackoverflow.com/a/32399377/2537017

(That's assuming you've removed the dnxcore50 so it can use the new class library).

score 0 · Answer 2 · answered Mar 26 '17 at 06:32

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I had such problem, and I found it's cause of post build setting on referred library project, in post build I was copying some un-managed native dll into output directory, by removing the post build event my problem solved.

answered Mar 26 '17 at 06:32

Oca Amir

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score 0 · Answer 3 · answered Apr 20 '20 at 22:58

I had a similar problem. The sibling project was not visible in the Add Reference dialog when trying to add to the related project. Through a random route, I discovered that the project I was working in had a signed assembly, while the project I was trying to add as reference was unsigned. This is not allowed, but there was no indication that there was a problem with the project in the dialog. It was simply not visible.

Can't add reference to project, Visual studio

3 Answers3