We have a project (logging lib) that is used by standard asp.net apps (4.0 framework) and also by sharepoint solutions (3.5 framework).
Is there a way to define both targets so that when we build the project both versions gets built?
Also, as anybody implemented something like this and distribute it via nuget? What's the best approach to publishing both versions on nuget?
Thanks
Answer is <supportedRuntime> config element. This allows you to specify all .NET runtimes your application can support and run under. Of course, in your application you can only use functionalities that all your chosen versions of .NET framework provide.
In short, you should have this in your config:
<configuration>
<startup>
<supportedRuntime version="v2.0.50727"/>
<supportedRuntime version="v4.0"/>
</startup>
</configuration>
It might be necessary to originally target your application to .NET 3.5 as <supportedRuntime> allows to go up in versions rather than go down.
You can create two C# projects (csproj files) where you include the same source files (or more projects, depending on your structure). One project should be targeted at .NET 3.5 and the other at .NET 4.0.
If you want to use features specific to .NET 4.0 then you could do it with conditional compilation symbols defined in the .NET 4 project.
Optionally, you could also add one or more solutions (for VS2008 and VS2010), each using one of the C# projects..
