if condition with nullable

Question

There is a lot of syntax sugar with Nullable like those:

int? parsed to Nullable

int? x = null
   if (x != null) // Parsed          


        

Answer 1

It's because a nullable bool cannot be implicitly converted to a bool. It's the same reason why you can do this :

int x1 = 7;
int? x2 = x1;

but you can't do this :

int? x1 = 7;
int x2 = x1;

you have to check before if it contains a value. Implicitly converting with nullable types can only be done when assigning a value, not when using that value.