In C# why can’t a conditional operator implicitly cast to a nullable type

by

The relevant section of the C# 3.0 spec is 7.13, the conditional operator:

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
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.

More Related Contents:

  1. Nullable types and the ternary operator: why is `? 10 : null` forbidden? [duplicate]
  2. Conditional operator assignment with Nullable types?
  3. Nullable type issue with ?: Conditional Operator
  4. Why is this code invalid in C#?
  5. Type result with conditional operator in C#
  6. Why doesn’t the conditional operator correctly allow the use of “null” for assignment to nullable types? [duplicate]
  7. Benefits of using the conditional ?: (ternary) operator
  8. How to check if an object is nullable?
  9. Method Call using Ternary Operator
  10. What does “DateTime?” mean in C#?
  11. How can I assign a Func conditionally between lambdas using the conditional ternary operator?
  12. How to parse a string into a nullable int
  13. C# conditional AND (&&) OR (||) precedence
  14. How to convert C# nullable int to int
  15. Compare nullable types in Linq to Sql
  16. C# nullable string error
  17. .NET – Convert Generic Collection to DataTable
  18. How can I format a nullable DateTime with ToString()?
  19. Nullable reference types: How to specify “T?” type without constraining to class or struct
  20. ? (nullable) operator in C# [duplicate]
  21. Invalid cast from ‘System.Int32’ to ‘System.Nullable`1[[System.Int32, mscorlib]]
  22. Optional return in C#.Net
  23. Why does .ToString() on a null string cause a null error, when .ToString() works fine on a nullable int with null value?
  24. Check inside method whether some optional argument was passed
  25. Best way to check for nullable bool in a condition expression (if …) [closed]
  26. Are nullable types reference types?
  27. Is the conditional operator slow?
  28. Correct way to check if a type is Nullable [duplicate]
  29. How do I use DateTime.TryParse with a Nullable?
  30. Serializing a Nullable in to XML

Leave a Comment