How do I edit a text buffer (or selected text) with the Visual Studio 2010 SDK

I found this extension together with sample very helpful, and now I have something which works. Though it was very counter intuitive at first, I was trying to get the at the code window while this example instead uses a command filter to fiddle with the text view by extending the editor.

The ITextView interface provides access to the text in the editor, you can access the Buffer through that and make changes that way.

• http://blogs.msdn.com/b/noahric/archive/2010/03/04/new-extension-align-assignments.aspx
• http://github.com/noahric/alignassignments