get all types in assembly with custom attribute

Question

Is there an elegant way to get all the types in an assembly that have a custom attribute?

So if I have a class

[Findable] public class MyFindableClass {} 

I would like to be able to find it in a collection of types returned by Assembly.GetTypes(...)

I can do it with a big vile hack, but I'm sure someone has a nicer way.

Answer 1

I wouldn't think you can dodge enumerating every type in the assembly, checking for the attribute, but you could use LINQ to make the query easier to understand:

Assembly assembly = ... var types = from type in assembly.GetTypes()             where Attribute.IsDefined(type, typeof(FindableAttribute))             select type; 

EDIT: Moved from MemberInfo.GetCustomAttributes to Attribute.IsDefined based on Marc Gravell's suggestion.