To turn a suitable interface into an abstract class
  1. Place the caret at the name of an interface in the editor, in the File Structure window, in Class View or Object Browser.
  2. Do one of the following:
    • On the main menu, choose ReSharper | Refactor | Convert | Interface to Abstract Class
    • Press Ctrl+Shift+R, then click Convert Interface to Abstract Class.
  3. If no conflicts are identified, the interface is converted into an abstract class with the same name. At the same time, modifiers of methods are changed accordingly. Otherwise, resolve conflicts.