I just upgraded my ArcGIS Desktop from 10.3.1 to 10.6 and my Visual Studio from 2013 to 2017. I have many Add-In projects that were created with Visual Studio 2013 and targeting ArcMap 10.3. For some reasons I am still continuing developing some of those Add-in projects I have, and now I have a problem on making my solutions run on this new environment.
These are what I have done when opening the VS solution on the new VS 2017:
1. Changed the reference of the ESRI dlls (eg: ESRI.ArcGIS.Carto, ESRI.ArcGIS.Geodatabase, etc).
2. From the Project's properties, I changed the "Target framework" to .NET Framework 4.5.
3. From the Project's properties, I changed the "Start external program" path to point the new path of ArcMap 10.6.
4. I ran the solution from Visual Studio 2017, it successfully opened the ArcMap 10.6 automatically, but the Add-In does not exist in the ArcMap's "Add-In Manager". Thus I cannot see my add-in's buttons / toolbar.
Is there any ideas what should I do to fix this? Looking forward to your advise.