Question

Is there a way to return only the types in a loaded assembly and not have it look for the nested ones so that the error TypeLoadException does not occur?

foreach (var type in _assembly.GetTypes().Where(type => type.IsClass))

Answer 1

IsNested property of System.Type might help you to filter those out.

You could also use Mono.Cecil to browse the assemblies if you do not need to load them.

Cecil is a library written by Jb Evain
(http://evain.net/blog/) to generate
and inspect programs and libraries in
the ECMA CIL format. It has full
support for generics, and support some
debugging symbol format.

In simple English, with Cecil, you can
load existing managed assemblies,
browse all the contained types, modify
them on the fly and save back to the
disk the modified assembly.