What makes ValueType class Special?

Question

When I trying to define a class which inherits from System.ValueType or System.Enum class, I\'m getting an error:

Cannot derive fro         


        

Answer 1

Microsoft does not publish its C# compiler source code, so we can only guess the check is embedded at compiler level.

Mono's C# compiler performs this kind of check at compile time, which you can see around line 2790 in Class.ResolveBaseTypes method,

https://github.com/mono/mono/blob/master/mcs/mcs/class.cs