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

If I clearly understood your issue, here could be solution like this:

public static class EnumExtenstions
{
    public static IEnumerable EnumGetOrderedValues(this Type enumType)
    {

        var fields = enumType.GetFields(BindingFlags.Public | BindingFlags.Static);
        var orderedValues = new List>();
        foreach (var field in fields)
        {
            var orderAtt = field.GetCustomAttributes(typeof(EnumOrderAttribute), false).SingleOrDefault() as EnumOrderAttribute;
            if (orderAtt != null)
            {
                orderedValues.Add(new Tuple(orderAtt.Order, (TEnum)field.GetValue(null)));
            }
        }

        return orderedValues.OrderBy(x=>x.Item1).Select(x=>x.Item2).ToList();
    }
}

usage:

var result = typeof(enumType).EnumGetOrderedValues();