This report is a case study on upgrading a C# 7 class library to C# 8 with nullable reference types. The project used is a collection of MVVM base classes, reflection code, and utility functions.

Microsoft has made available Nullable Reference Types as preview for developers who want to try the new feature and provide feedback.

C# allows you to define two types of variables: value types and reference types. The value types hold actual values, while reference types hold references to values stored somewhere in memory.

In a surprise move Unity has published the engine and editor C# source code on GitHub under a reference-only licence.