Chapter 3, Implementing Design Patterns – Basics Part 1, and the first part of this chapter have illustrated the GoF patterns without using any frameworks. It is worth covering this as, sometimes, a framework is not available for a specific pattern or applicable in a particular scenario. Additionally, it is important to understand what functionality the framework is providing in order to know when a pattern should be used. The rest of this chapter will look at a couple of features that .NET Core provides that support some of the patterns we have covered so far.