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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?

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  • I don't know whether this can be done; my guess is "no." But if you're using source control of some sort, you could copy the library to a separate directory in source control, check it out, modify the project type, and pull that project into your solution, then keep the two projects in sync via source control... Commented Oct 10, 2016 at 13:32
  • It is not possible to reference a xproj from a csproj directly. You have possiblty to Deploy the xproj as a NuGet package and use the NuGet package in your csproj. Commented Oct 10, 2016 at 13:40
  • Every time I modify the code of the library I have to build it, create the NuGet package, unintall the current version and than install the new one in the .Net Framework project, right ? Commented Oct 10, 2016 at 13:47
  • .NET Standard provide common platform for Asp.Net Core, Asp.Net Framework and Xamarin. Some helpful links Intoducing .Net Standard [Msdn .Net Standard][2] [2]: learn.microsoft.com/en-us/dotnet/standard/net-standard Commented Jul 28, 2017 at 22:44

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

https://learn.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.

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

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