using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var handler = WorkflowEventHandler.CONSECUTIVE_CASE_CREATED;

        var attribute = typeof(WorkflowEventHandler)

            .GetField(handler.ToString())

            .GetCustomAttributes(typeof(WorkflowEventHandlerMapAttribute), false)

            .FirstOrDefault() as WorkflowEventHandlerMapAttribute;

        Console.WriteLine(attribute.MapTo);

    }

}

​

enum WorkflowEventHandler

{

    [WorkflowEventHandlerMap(typeof(ConsecutiveCaseCreated))]

    CONSECUTIVE_CASE_CREATED = 1,

    [WorkflowEventHandlerMap(typeof(ConsecutiveCaseCancelled))]

    CONSECUTIVE_CASE_CANCELLED = 2,

    [WorkflowEventHandlerMap(typeof(ConsecutiveCaseModified))]

    CONSECUTIVE_CASE_MODIFIED = 3,

    [WorkflowEventHandlerMap(typeof(IntermittentCaseCreated))]

    INTERMITTENT_CASE_CREATED = 4,

    [WorkflowEventHandlerMap(typeof(IntermittentCaseTimeAdjusted))]

    INTERMITTENT_CASE_TIME_ADJUSTED = 5,

    [WorkflowEventHandlerMap(typeof(IntermittentCaseTimeDeleted))]

    INTERMITTENT_CASE_TIME_DELETED = 6,

    [WorkflowEventHandlerMap(typeof(CaseChangedType))]

    CASE_CHANGED_TYPE = 7

}

​

[AttributeUsage(AttributeTargets.Field)]

class WorkflowEventHandlerMapAttribute: Attribute

{

    public Type MapTo { get; init; }

    public WorkflowEventHandlerMapAttribute(Type mapTo) => MapTo = mapTo;

}

​

class ConsecutiveCaseCreated { }

class ConsecutiveCaseCancelled { }

class ConsecutiveCaseModified { }

​

class IntermittentCaseCreated { }

class IntermittentCaseTimeAdjusted { }

class IntermittentCaseTimeDeleted { }

class CaseChangedType { }