It would be be good for readability if the [UnmappedProperty]-Attribute would allow multiple strings instead of only one.

Problem

Attributes are identified by name instead of type.
Therefore, subclasses of attributes are not taken into account by the analyzer logic.

Because it is not possible to create a constant string array, it is not possible to simplify some common ignored mappings (we have some methods that map to entity-framework entities and should ignore some fields that are set in the context).

One solution would be to be able to inherit the attribute (IgnoreProperties) and specify these common mappings there, so the final custom Attribute would like this:

    public class IgnoreFooAndBarPropertiesAttribute : UnmappedPropertiesAttribute
    {
        public IgnoreFooAndBarPropertiesAttribute() : base("Foo", "_Bar")
        {
        }
    }

and used like this

        [MappingMethod]
        [IgnoreFooAndBarProperties]
        protected override void MapInternal(ADto source, [MappingTarget] ABusinessObject dest)
        {
        }