How to write extended method for an enum in C#. / Как написать метод расширение для перечисления

[finesoul]

The problem is that you cannot write generic with "where T: System.Enum" or "where T: System.ValueType" .
Fortunately I've found a workaround. It works even better than i expected it would.


The bonus is an inderect call of .AllOf<T>(...). On the picture we see a call of non-generic AllOf( ...) which is forbidden because it's private method. And still there is no error . But hint clarifies the miracle. Visual studio converts behind the scene a call AllOf( ...) into AllOf<T>(...) which is really nice :).

1. /// <summary>


2. /// Checks wheither at least one of optional flags is set


3. /// </summary>


4. /// <param name="flagsWeHave">The flags we have.</param>


5. /// <param name="flagsWeSearch">The flags we search for.</param>


6. /// <returns> true, if at least one of the flags in bit representation of both values is matching </returns>


7. private static bool AnyOf(this IConvertible flagsWeHave, IConvertible flagsWeSearch)


8. {


9.     return (flagsWeHave.ToInt32(CultureInfo.InvariantCulture)


10.         & flagsWeSearch.ToInt32(CultureInfo.InvariantCulture)) > 0;


11.  


12. }


13.  


14. /// <summary>


15. /// Checks wheither at least one of optional flags is set


16. /// </summary>


17. /// <param name="flagsWeHave">The flags we have.</param>


18. /// <param name="flagsWeSearch">The flags we search for.</param>


19. /// <returns> true, if at least one of the flags in bit representation of both values is matching </returns>


20. public static bool AnyOf<T>(this T flagsWeHave, T flagsWeSearch) where T : IConvertible


21. {


22.     if (!typeof(T).IsEnum && typeof(T) != typeof(int))


23.         throw new ArgumentOutOfRangeException("T can only be enum or int");


24.     return AnyOf(flagsWeHave as IConvertible, flagsWeSearch as IConvertible);


25.  


26. }


27.  


28. /// <summary>


29. /// Checks wheither at least one of optional flags is set


30. /// </summary>


31. /// <param name="flagsWeHave">The flags we have.</param>


32. /// <param name="flagsWeSearch">The flags we search for.</param>


33. /// <returns> true, if at least one of the flags in bit representation of both values is matching </returns>


34. private static bool AnyOf(this Enum flagsWeHave, Enum flagsWeSearch)


35. {


36.     return AnyOf(flagsWeSearch as IConvertible, flagsWeSearch as IConvertible);


37. }