针对。net框架的多个版本的最佳方法是什么?

I'm building a class library and I will deploy it a NuGet package, which lets me choose different assemblies to be added as references based on the .NET framework version of the project it's added to. This is a very nice feature, but what I'm wondering is whether it is possible to have a single class library project, and build it against mulitple versions of the .NET framework?I'm building a class library and I will deploy