Question: I have a lot of C# code that uses public fields, and I would like to convert them to properties.

I have Resharper, and it will do them one by one, but this will take forever.

Does anyone know of an automated refactoring tool that can help with this?

Answer: 
Resharper does it very quickly, using Alt+PageDown / ALt+Enter (with the default key bindings). If you are at the first field, Alt+PageDown will jump to the next one (since it'll include wrapping public fields as a suggested refactoring), and Alt+Enter will prompt you to wrap it in a property.

Since you most likely want to avoid a full blanket wrapping of all properties, this is probably the quickest approach. It's quite fast to do this to a class, since it jumps exactly where you need to go...
Refactor fields to properties (no extensions needed):
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[![Refactor C# fields to properties](https://i.stack.imgur.com/Bhdd4.gif)](https://i.stack.imgur.com/Bhdd4.gif)

**Step 1: Refactor all fields to be encapsulated by properties**

**Step 2: Refactor all properties into auto-implemented properties**