How to get the value of AttributeName of XMLAttribute of object C#

I want to use reflection to get the AttributeName of an XMLAttribute.

public class Rate{
    [XmlAttribute(AttributeName = "roomcode")]
    public string Code { get; set; }
}

When I do:

var rate = typeof(Rate).GetProperty("Code").GetCustomAttributes(true);

I can see that there is a property on the object rate with AttributeName "roomcode", but no matter what I try, I can't seem to access it.

I want to do a unit test where I compare the attributenames on my object to the attributenames of an xml node.