How to sort enum using a custom order attribute?

Question

I have an enum like this:

enum MyEnum{
 [Order(1)]
 ElementA = 1,
 [Order(0)]
 ElementB = 2,
 [Order(2)]
 ElementC = 3
}

And I want to li

Answer 1

public class OrderAttribute : Attribute
{
    public int priority;

    public OrderAttribute(int priority)
    {
        this.priority = priority;
    }
}

public enum Test
{
    [Order(1)] value1 = 1,
    [Order(2)] value2 = 2,
    [Order(0)] value3 = 3
}

private static void Main(string[] args)
    {
        Dictionary priorityTable = new Dictionary();

        var values = Enum.GetValues(typeof (Test)).Cast();
        MemberInfo[] members = typeof (Test).GetMembers();
        foreach (MemberInfo member in members)
        {
            object[] attrs = member.GetCustomAttributes(typeof(OrderAttribute), false);
            foreach (object attr in attrs)
            {
                OrderAttribute orderAttr = attr as OrderAttribute;

                if (orderAttr != null)
                {
                    string propName = member.Name;
                    int priority = orderAttr.priority;

                    priorityTable.Add(propName, priority);
                }
            }
        }

        values = values.OrderBy(n => priorityTable[n.ToString("G")]);

        foreach (var value in values)
        {
            Console.WriteLine(value);
        }

        Console.ReadLine();
    }

This will output:

value3

value1

value2