可以考虑用Area
我是按模块划分的
areas/a/a1/controllers
areas/a/a1/models
areas/a/a1/views
areas/a/a1/viewmodels
areas/a/a2/controllers
areas/a/a2/models
areas/a/a2/views
areas/a/a2/viewmodels
areas/b/b1/controllers
areas/b/b1/models
areas/b/b1/views
areas/b/b1/viewmodels
areas/b/b2/controllers
areas/b/b2/models
areas/b/b2/views
areas/b/b2/viewmodels
Area is correct.