问题:

Is there a way in Visual Studio (a hotkey) to automatically import a type (or choosing between known namespaces) like the Ctrl + O in Eclipse?

回答1:

When the red caret appears at the end of your member, just hit Shift + Alt + F10, then use arrows keys to choose the right option:

回答2:

Yes, Visual Studio can add the using for you. When you type in a class name, hit Ctrl + . and then Enter (the first option is 99.99% the right one, so just hit Enter). And you can have it add the using at the top of the file for the namespace of that class. I use it all the time.

This is easier than Shift + Alt + F10 + Enter as it's fewer keys and the . and Enter are closer.