SmartEnum.GetEnumerator FieldNotImplementException

[LorneCash]

Given these enums I would like to be able to do the following but I can't:
var eventTypesCluster2 = SmartEnum.GetEnumerator<EventType>().Where(x => x.GetValueOf<Cluster>("Cluster") == Cluster.Two).ToList();

The goal here as you can see is to get a subset of valid enum values for a given situation but if just one enum value does not have the EnumValue with the specified key the whole enumeration fails??? That makes no sense!

I can demonstrate that issue more clearly like this:
var test = EventType.Status.GetValueOf<Cluster>("Cluster");
My expectation would be that this should return null since the EnumValue doesn't exist.

but I could kinda understand your apprehension there since it doesn't really make sense for non-nullable types like enum Cluster in this case.

A possible solution would be to keep allowing GetValueOf<> to throw the FieldNotImplementException for non-nullable types but to return null for nullable types. With that solution by adding the ? now any variable can be nullable and would return null rather than the FieldNotImplementException:
var test = EventType.Status.GetValueOf<Cluster?>("Cluster");

If you're not so keen on my previous suggestion hopefully you'll like this potential solution because it should feel familiar. Make a TryGetValueOf<> method.
An example might look like this:
var test = EventType.Status.TryGetValueOf<Cluster>("Cluster", out var clusterValue);

In my opinion I would say you should strongly consider implementing both options because being able to enumerate the enum without throwing an exception should be valuable in many cases.

public enum Cluster
{
	Unknown = -1,
	Zero = 0,
	One = 1,
	Two = 2
}

public enum EventType
{
	[EnumValue("Code", "T")]
	[EnumValue("Cluster", Cluster.One)]
	Trade,

	[EnumValue("Code", "Q")]
	[EnumValue("Cluster", Cluster.One)]
	Quote,

	[EnumValue("Code", "A")]
	[EnumValue("Cluster", Cluster.Two)]
	AggregatePerSecond,

	[EnumValue("Code", "AM")]
	[EnumValue("Cluster", Cluster.Two)]
	AggregatePerMinute,

	[EnumValue("Code", "I")]
	[EnumValue("Cluster", Cluster.Two)]
	Imbalance,

	[EnumValue("Code", "Status")]
	Status,
}

[LorneCash]

I also tried adding this EnumValueAttribute to Status [EnumValue("Cluster", null)] and then doing this: var test = EventType.Status.GetValueOf<Cluster?>("Cluster");

but then I just get a different exception: SmartEnums.WrongEnumValueTypeException

My goal here is that I'm REALLY trying NOT to add an additional value to enum Cluster just to handle when the EventType does not have a cluster.