Greyed out my codes of null checking before invoking a delegate

Question

I write unity codes in VS 2015, which means it\'s in c#4 and the null condition operator is not available.

Before invoking a delegate, I did a null check. However the co

Answer 1

Before invoking a delegate, I did a null check. However the codes are greyed out. Does it mean the grey codes are not effective just like comments?

It means that the Visual Studio pre-compiler/design-time-compiler detects the statement is most likely not needed.

If so what should I do to prevent invoking a null delegate?

Nothing, the compiler will still determine at compile time (and actually at run-time as well) if the statement is needed.