I have a project(A) that references an assembly from an external project(B) class library that is located in another vs solution.
I have yet to understand how i can efficiently debug the class library from B while running the program from project A. Is there something I have to enable on project B such as debug info etc so I can step-into at debug time from A?
Try disabling Just My Code (JMC).
By default the debugger tries to restrict the view of the world to code that is only contained within your solution. This is really heplful at times but when you want to debug code which is not in your solution (as is your situation) you need to disable JMC in order to see it. Otherwise the code will be treated as external and largely hidden from your view.
EDIT
When you're broken in your code try the following.
If you have main (project A) and external library (project B):
Open (project A) solution in Visual Studio.
Right click on solution -> Add Existing Project -> then select the .csproj file of your external library (project B).
Again in visual studio right click on (project A) -> Add -> Project Refference... -> and then add checkmark on your external library which you want to debug (project B).
Finally place brake-points in (project A) where your external library (project B) is called and run with F5.
NuGet references
Assume the -Project_A (produces project_a.dll) -Project_B (produces project_b.dll) and Project_B references to Project_A by NuGet packages then just copy project_a.dll , project_a.pdb to the folder Project_B/Packages. In effect that should be copied to the /bin.
Now debug Project_A. When code reaches the part where you need to call dll's method or events etc while debugging, press F11 to step into the dll's code.
I was having a similar issue as my breakpoints in project(B) were not being hit. My solution was to rebuild project(B) then debug project(A) as the dlls needed to be updated.
Visual studio should allow you to debug into an external library.
The quickest way to do this on a one-off basis is to open the Proj B file directly in the Visual Studio instance in which you are editing and launching Project A (File => Open => File). You don't need to add the file to the solution. Just having it open in the editor will let you create your breakpoints directly in the Project B file.
