Extending an enum via inheritance

by

The reason you can’t extend Enums is because it would lead to problems with polymorphism.

Say you have an enum MyEnum with values A, B, and C , and extend it with value D as MyExtEnum.

Suppose a method expects a myEnum value somewhere, for instance as a parameter. It should be legal to supply a MyExtEnum value, because it’s a subtype, but now what are you going to do when it turns out the value is D?

To eliminate this problem, extending enums is illegal

More Related Contents:

  1. Returning type Java and C# [closed]
  2. Is shifting bits faster than multiplying and dividing in Java? .NET? [closed]
  3. Why C# implements methods as non-virtual by default?
  4. What are major differences between C# and Java?
  5. How to read a .NET Guid into a Java UUID
  6. Does C# have a way of giving me an immutable Dictionary?
  7. Are Java and C# regular expressions compatible?
  8. DataTable equivalent in Java [duplicate]
  9. Encryption compatible between Android and C#
  10. How captured value in anonymous methods are implemented in .NET
  11. Windows service NOT shown in add remove programs under control panel
  12. C# difference between == and Equals()
  13. Get Enum from Description attribute [duplicate]
  14. How to Get IP Address?
  15. How do I convert Unicode escape sequences to Unicode characters in a .NET string?
  16. How do I upload a file to an SFTP server in C# (.NET)? [closed]
  17. C# Drag drop does not work on windows 7
  18. Why is it impossible to override a getter-only property and add a setter? [closed]
  19. What difference is there between WebClient and HTTPWebRequest classes in .NET?
  20. Detect Windows font size (100%, 125%, and 150%)
  21. How do I create a generic class from a string in C#? [duplicate]
  22. Debug Console window cannot accept Console.ReadLine() input during debugging
  23. UserControl with header and content – Allow dropping controls in content panel and Prevent dropping controls in header at design time
  24. Why are all the collections in my POCO are null when deserializing some valid json with the .NET Newtonsoft.Json component
  25. Should you obfuscate a commercial .Net application?
  26. How do I re-write a SQL query as a parameterized query?
  27. streamWriter rewrite the file or append to the file
  28. ComboBox placeholder text (hint, cue banner, default text)
  29. XmlSerializer property converter
  30. Limit only one session per user in ASP.NET

Leave a Comment