How can I use the Nullable Operator with the Null Conditional operator?

Question

Old Way

int? myFavoriteNumber = 42;
int total = 0;
if (myfavoriteNumber.HasValue)
  total += myFavoriteNumber.Value *2;

New way?

int? myFavoriteNumber = 42; 
total += myFavoriteNumber?.Value *2; //fails 

Answer 1

The null-propagation operator ?. will as it says, propagate the null value. In the case of int?.Value this is not possible since the type of Value, int, cannot be null (if it were possible, the operation would become null * 2, what would that mean?). So the 'Old Way' is still the current way to do this.