I'm developing my first add-in for Visual studio and we need to add a context menu item to the solution explorer, that shows up for particular file types only (in our case - ".resx").
I've been googling for 2 days now, unable to find any tutorials or code-samples... Only very basic things like adding a menu-item to the VS "tools" menu etc.
Well, you need to create a dynamically visible command that you will make visible only when the selected node in the Solution Explorer is .resx file and then add the command as a child of the Solution Explorer context menu (you would need GUID:ID pair of the latter).
Here is a good article showing how to do that: http://blogs.rev-net.com/ddewinter/2008/03/22/dynamic-menu-commands-in-visual-studio-packages-part-2/
Take a look at this video. It describes how to append and control visibility of a new menu item by IDTCommandTarget interface.
来源：https://stackoverflow.com/questions/2486818/visual-studio-add-in-adding-a-context-menu-item-to-solution-explorer