File and JSON Post in MVC

It seems strange to me that MVC doesn't handle posting a file and a model at the same time from AJAX by default. It'd be great if you could just send your data and "poof" it's all there for you. It doesn't seem to be, so I'll put down what I've found that works for me.

You create a javascript FormData object. Add your model (with property "model") and your file('s). Post as normal.

In your action method, remove any model parameter you had. You won't need it. Just look at the Request.Form["model"] and deserialize your json. Get your files in the Request.Form collection.