Introduce GetAll() method

[RFBomb]

I noticed that there is no 'GetAll()' method for this, as described on this page:

https://docs.microsoft.com/en-us/dotnet/architecture/microservices/microservice-ddd-cqrs-patterns/enumeration-classes-over-enum-types

Could this be added to the base class?

/// <summary>
        /// Retrieve all enumerations of the SmartEnum
        /// </summary>
        /// <returns>new <see cref="IEnumerable{T}"/> of type <typeparamref name="T"/></returns>
        /// <seealso cref="https://docs.microsoft.com/en-us/dotnet/architecture/microservices/microservice-ddd-cqrs-patterns/enumeration-classes-over-enum-types"/>
        public static IEnumerable<T> GetAll() =>
        typeof(T).GetFields(System.Reflection.BindingFlags.Public |
                            System.Reflection.BindingFlags.Static |
                            System.Reflection.BindingFlags.DeclaredOnly)
                 .Select(f => f.GetValue(null))
                 .Cast<T>();

This should get all of the static enum values defined

[ardalis]

Hmm, I don't think I'd implement it as shown, since it would pay the reflection cost every time. Typically when I need this I just add it myself and manually include all of the appropriate fields (in the order I'd like them to appear in).

[ardalis]

Possibly a source generator like this one could do the trick in a flexible and performant manner: https://stackoverflow.com/questions/66793030/replacing-reflection-with-source-generators

[wilsonrivera]

I don't know if this is something that still willing to implement into the library using source generators or if is being worked on, but if still interested and nobody has claimed it, I'd love to help with this!

[ardalis]

All yours @wilsonrivera !

[RFBomb]

Awesome!

[RFBomb]

Hey, I just realized that GetAllOptions() is a thing

https://github.com/ardalis/SmartEnum/blob/7117b76bc65dab300073acee7e32f5cf033b9e25/src/SmartEnum/SmartEnum.cs#L64

which I think is what I was looking for? But its currently a private item in the abstract class. Maybe it just needs to be exposed