What's the currently recommended way of performing partial updates with Web API?

I'm wondering how to implement partial updates with ASP.NET Web API's RESTful interface? Let's say for example we are passing objects over the wire of the following structure:

public class Person {
    public int Id { get; set; }
    public string Username { get; set; }
    public string Email { get; set; }
}

How would one support updating just parts of a Person at a time, for example the Email property? Is it recommended to implement this via OData and the PATCH verb, or would it be better to implement PATCH oneself?