First I try to compile the core project SharpRespository.Respository for net451 and netstandard1.2 (I think they actually mean the same according to this table: https://github.com/davidfowl/NetStandard).
So far, I've replaced System.Runtime.Caching with the Caching extension library for .NET Core: https://github.com/aspnet/Caching
There's a lot of configuration related compile errors to be fixed, and some related to cryptography.