Why does null need an explicit type cast here? [duplicate]

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From chapter 7.13 of the C# Language Specification:

The second and third operands of the ?: operator control the type of the conditional expression. Let X and Y be the types of the second and third operands. Then,

  • If X and Y are the same type, then this is the type of the conditional expression.
  • Otherwise, if an implicit conversion (§6.1) exists from X to Y, but not from Y to X, then Y is the type of the conditional expression.
  • Otherwise, if an implicit conversion (§6.1) exists from Y to X, but not from X to Y, then X is the type of the conditional expression.
  • Otherwise, no expression type can be determined, and a compile-time error occurs.

In your case, there is no implicit conversion from int to null nor the other way around. Your cast solves the problem, int is convertible to int?

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