Ch06.md

Chapter 6 Examples

Examples from Chapter 6 (Inheritance) of Programming C# 12.0 (O'Reilly).

• Example 1. Specifying a base class
• Example 2. Inheritance chain

Inheritance and Conversions

• Example 3. Feeling downcast
• Example 4. The as operator
• Example 5. The is operator with a declaration pattern

Interface Inheritance

• Example 6. Interface inheritance
• Example 7. Implementing a derived interface

Generics

• Example 8. Deriving from a generic base class
• Example 9. Requiring a type argument to derive from the type it's applied to
• Example 10. A method accepting any Base
• Example 11. A method accepting any IEnumerable<Base>
• Example 12. Passing an IEnumerable<T> of a derived type
• Example 13. A method accepting any ICollection<Base>
• Example 14. Error: trying to pass an ICollection<T> with a derived type
• Example 15. Covariant type parameter
• Example 16. Class hierarchy with actual members
• Example 17. Comparing shapes
• Example 18. Contravariant type parameter
• Example 19. Changing an element in an array
• Example 20. Passing an array with derived element type

Virtual

• Example 21. A class with a virtual method
• Example 22. Using a virtual method
• Example 23. Overriding virtual methods
• Example 24. Exploiting virtual methods
• Example 25. An override that narrows the return type
• Example 26. An abstract class
• Example 27. Abstract interface implementation
• Example 28. Base type version 1.0
• Example 29. Class derived from version 1.0 base
• Example 30. Base type version 1.1
• Example 31. Hidden versus virtual method
• Example 32. Avoiding warnings when hiding members
• Example 33. Hiding to change the signature
• Example 34. A static virtual property in an interface
• Example 35. Invoking static virtual interface members
• Example 36. A base type with overloads distinguished only by a value type constraint
• Example 37. Spelling out the effect of the struct constraint
• Example 38. Invoking the two methods
• Example 39. Overriding one of two ambiguous-looking methods
• Example 40. Using the default constraint

Sealed Methods and Classes

• Example 41. A sealed method
• Example 42. A sealed class

Accessing Base Members

• Example 43. Calling the base method after overriding

Inheritance and Construction

• Example 44. No default constructor in derived class
• Example 45. Invoking a base constructor explicitly
• Example 46. Exploring construction order

Record Types

• Example 47. Record inheritance
• Example 48. Instantiating derived record types
• Example 49. Deriving from a positional record
• Example 50. Passing a constant to a positional base record
• Example 51. Using a derived record that has made a mandatory base property optional
• Example 52. Passing positional base record arguments with an ordinary constructor
• Example 53. Making an optional base property class positional
• Example 54. Using with on a base record type
• Example 55. Testing how with interacts with inheritance