With complex types GetInterface() dont find interface "IDictionary`2"

[evorios]

https://github.com/loune/MVCStuff/blob/master/Extensions/DefaultDictionaryBinder.cs#L53
.NET4.5
I have MyViewModel with type Dictionary<id, ComplexType>.
GetInterfaces(typeof(MyViewModel)) return 3 interfaces:

1. System.Collections.Generic.ICollection'1[[System.Collections.Generic.KeyValuePair'2[[System.Int32, ...],[namespace.Models.MyViewModel, ...]]
2. System.Collections.Generic.IEnumerable'1[[System.Collections.Generic.KeyValuePair'2[[System.Int32, ...],[namespace.Models.MyViewModel, ...]]
3. System.Collections.IEnumerable

So, code modelType.GetInterface("System.Collections.Generic.IDictionary'2") return null. And extension dont work.
How to fix it?

[evorios]

I read comments from blog and create fork with worked version:
evorios@548bdc0