Visual Studio - DDD Modules and Onion

Question

I am developing a C# application following DDD and Onion Architecture concepts, but I cannot realize how to separate the code:

1. I want it separated by modules -bounded contexts- (i.e. Sales; Suppliers; Clients)
2. and I want it separated by layers (i.e. Core; Services)

It comes to mind doing the following: one project per layer and one folder (with an unique namespace) per module. For example:

Project Core

• Folder Sales
• Folder Suppliers
• Folder Clients

Project Services

• Folder Sales
• Folder Suppliers
• Folder Clients

However, I think I could do it reverse: one project per module and one folder per layer.

I dont know if there are more approaches.

Thank you.

Answer 1

One approach that works well in VS is the following:

• Create one project per module. This is a natural approach, because you have explicit dependencies between projects.
• Use Solution Folders to group the projects into layers. You can prefix the layer with a number, so that it shows up in order within visual studio. Note that solution folders are virtual, i.e. not visible in the file system, but that is usually not a concern.