I am curious about why wouldn't this command work?
File.AddExistingItem
Since it's stated in MSDN library and it has its own chapter about it!
https://msdn.microsoft.com/en-us/library/6h4c0t7y.aspx
I am using VS2015
1. Open the IDE's command window by View->Other Window->Command Window
(or simply by shortcut key: CTRL + ALT + A
2. Type File.AddExistingItem Whatever_Valid_CSHARP_Filepath
(As you can see there is no auto-completion for File.AddExistingItem)
3.It comes out "Command "File.AddexistingItem" is not valid."
But the similar command File.AddExistingProject works adding *.csproj
(using File.AddExistingProject works, and no "Command xxx is not valid" coming out)
Does anyone know why it doesn't work?
And How can I fix it? If it's possible.