.Net Framework and .Net Core in same solution

Question

I have an application targeting .NET Framework, and now I need to develop a library in .NET Core. I plan to put both projects in the same solution and add the .NET Core library as a reference in the .NET Framework project.

Can this be done? If the answer is yes, how can this be done?

Solution

There is an article published in April 2017 on how to support both runtimes from the same solution:

https://docs.microsoft.com/en-us/dotnet/core/porting/project-structure

It boils down to 2 methods:

• Having both frameworks configured in the same project (e.g. *.csproj):

Replace existing projects with a multi-targeted .NET Core project.

• Having a separate project for each framework:

Keep existing projects and create a .NET Core project.

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We are actively discussing which way to go in pythonnet, since the project supports .NET Framework on Windows and Mono on Linux/OSX. Now we are adding cross-platform pythonnet support:

https://github.com/pythonnet/pythonnet/pull/518