I have a solution for Orchard CMS, which, when I first opened it, prompted me asking whether to trust projects from an external source. I unchecked the box for “Ask for every project in the solution”, and it opened fine. Now, I used a code generation tool to add a project to the solution while it was open. VS then detected a change, and prompted me to reload the solution. After reloading, I see most – save 1 or 2 out of a great many – projects failed to load. When I click on an individual project and reload that, I get asked whether I trust it again. When I click OK, the project loads fine. Only issue is I don’t want to go and manually reload every project. I tried closing the solution and opening it again, but then most projects still fail to load.
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You can reload multiple projects at once: simply select multiple projects in the Solution Explorer (e.g. via Ctrl+Click or Shift+Click), right-click the selection, and choose Reload Project.