Another important piece of modern C# is now available in .NET nanoFramework: 
Dictionary<TKey, TValue> has been added to System.Collections.

This is part of the ongoing public preview of generics support, and another step towards making embedded development with C# feel more natural, expressive, and productive — even on resource-constrained devices.

If you haven’t tried the generics preview yet, this is a great moment to give it a spin.

Try it, build something real with it, and let us know what works, what breaks, and what still needs polishing.