Why assigning null in ternary operator fails: no implicit conversion between null and int?

Question

This fails with a There is no implicit conversion between \'null\' and \'int\'

long? myVar = Int64.Parse( myOtherVar) == 0 ? null : Int64.Parse(         


        

Answer 1

The Compiler tries to evaluate the expressions from left to right

long? myVar = Int64.Parse( myOtherVar) == 0 ? null : Int64.Parse( myOtherVar);

int64.parse method return a long value not a nullable long value. so there is no conversion between null and Int64.Parse( myOtherVar); So, try this one

long? myVar = Int64.Parse(myOtherVar) == 0 ? (long?) null : Int64.Parse(myOtherVar);

OR
long? myVar = Int64.Parse(myOtherVar) == 0 ? null : (long?) Int64.Parse(myOtherVar);