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

Assume the OrderAttribute class is as follows:

public class OrderAttribute : Attribute
{
    public readonly int Order;

    public OrderAttribute(int order)
    {
        Order = order;
    }
}

The helper method to obtain sorted values of enum:

public static T[] SortEnum()
{
    Type myEnumType = typeof(T);
    var enumValues = Enum.GetValues(myEnumType).Cast().ToArray();
    var enumNames = Enum.GetNames(myEnumType);
    int[] enumPositions = Array.ConvertAll(enumNames, n =>
    {
        OrderAttribute orderAttr = (OrderAttribute)myEnumType.GetField(n)
            .GetCustomAttributes(typeof(OrderAttribute), false)[0];
        return orderAttr.Order;
    });

    Array.Sort(enumPositions, enumValues);

    return enumValues;
}