Refactoring the logging

Now that the tests are working OK, I want to turn my attention back to the other goal: cleaner code for task parameter logging. Here's the current implementation:

Loading Gist 7517928

I want to refactor this to generalize. I'm not going to add additional tests just yet, even though maybe I should. At least I have enough test coverage that I don't have to spend time manually testing as I go.

I used very small steps, but the outline is:

1. Extract Method LogInputs, push it up to base class LoggingTask
   
2. Replace the hard-coded "Foo" and this.Foo with reflection via this.GetType().GetProperty("Foo").Name and .GetValue(this).
   
3. Extract method LogInput, taking a PropertyInfo
   
4. Replace GetProperty() with a loop over GetProperties(), filtering by the [Required] attribute.
   
5. Extract Method GetPropertyInfos and HasAttribute.

Here's the result:

Loading Gist 7521986

As an indication that I'm on the right track, see how small the test task is:

Loading Gist 7521995

You will also need this extension:

Loading Gist 7522018

I don't really like that he [Required] attribute is used to find parameters; that's not quite the right rule. But I'll come back to that later.