Why is Visual Studio replacing List<T>.Length with List<T>.Count?

Question

I've noticed that if have a List<T> (or a few other types) and I press . then among the intellisense suggestions I get Length

If I select Length then what's actually typed is Count

I can see why this would happen, there's no Length property on a List<T> and if I'm looking for it I probably want Count. My question is, how does Visual Studio know to do this? I can't see anything in the List<T> class or anywhere else that encodes Length as an alias for Count.

Answer 1

This is a ReSharper 10 feature.

It integrated the Postfix Templates plugin in this version, and this is one of the completions it supports (use the correct Length or Count property).

I'm excited to announce that this plugin is now integral part of ReSharper 10!

The project page states:

Length/Count code completion solves one of the most common mistypings when dealing with arrays or collections: