ASP.NET MVC controllers static methods

A discussion came up at work recently about why ASP.NET MVC doesn't use static methods for its controller methods. Whilst I was on the side of the fence against using static methods, the only two arguments I could think for non-static action methods were inheritence and the ability to mock (which inheritence gives you).

What was Microsoft's design choice for non-开发者_如何学JAVAstatic actions/methods over static?

While I don't know minds of those that designed the ASP.NET MVC Framework here is the big one for me:

An instance controller is instantiated once per request, multiple requests can be happening simultaneously. If a controller is static then any state on the controller is shared across all requests simultaneously. You probably don't want that. Updating that shared state becomes a minefield of locking contention, possible deadlocks and very hard to track bugs if locking isn't implemented properly.

In short, a static controller would be a nightmare to work with.

You have for example controller "Home" and action "FillData", and another controller "Student" and action "FillData". Imagine what will happen if you make action "FillData" a static method, and could be called in any other controller easily. It would be a big ISSUE.