Question

Possible Duplicate:
Nullable types and the ternary operator: why is `? 10 : null` forbidden?

I want to assign a value or null value to x (which is a nullable integer) according to a case (you can see below)

int? x;
x = stackoverflow.ToString() != "" ? int.Parse(stackoverflow.ToString()) : null;

But it gives below error.

Type of conditional expression cannot be determined because there is no implicit conversion between 'int' and '<null>' 

Why?

Answer 1

Cast the int to a nullable int.

x = stackoverflow.ToString() != "" ? 
       (int?)int.Parse(stackoverflow.ToString()) : null;