Load Objects from a specific directory into a list?

Hi there..

I want to know how to list all Objects of a specific Type, from a specific direction - into a list?

Like:

All textures of "Assets/Texturen/Dungeon" OR all textures from "Assets/Texturen/Farmland" OR all Prefabs from "Assets/Prefabs/Weideland" ...and so on.

It´s cause i need them to be listed in my Editor extention as buttons. But only the current selected Folder and object Type.