Yes, dynamic stops the compiler from knowing the type on any parameters, properties, or method return types. Add an explicit cast like: (MethodResult)IsValid(someObject)); The reason here is that once you enter the dynamic world in C# you are going into late binding. The compiler can’t verify this code because it can no longer use any … Read more
Edited to update for null safety (use Object? instead of Object). Another perspective on dynamic is that it’s not really a type – it’s a way to turn off type checking and tell the static type system “trust me, I know what I’m doing”. Writing dynamic o; declares a variable that isn’t typed – it’s … Read more
First of all, thanks for pointing out that the spec isn’t clear on the non-dynamic nullable-bool case. I will fix that in a future version. The compiler’s behavior is the intended behavior; && and || are not supposed to work on nullable bools. The dynamic binder does not seem to implement this restriction, though. Instead, … Read more