C# Nullable in conditional statement [duplicate]

Question

Why do we need explicit cast in second statement?

bool? a = null; bool b = false; bool c = true;

1.) if(b || c) a = b; else a = null;

2.) a = (b || c)?(Nullable<bool>)b:null;

Answer 1

The conditional operator is an expression, thus it needs a return type - also both cases have to have the same return type. In your case, there is no way of determining the return type automatically, thus you need to cast.