Providing Context with interfaces and ASP.NET MVC Filter Providers

FooActionFilter.cs

public class FooActionFilter : IActionFilter
{
	public void OnActionExecuting(ActionExecutingContext filterContext)
	{
		var fooController = (IFoo) filterContext.Controller;

		fooController.Context = new FooContext();
	}

	public void OnActionExecuted(ActionExecutedContext filterContext)
	{
		var fooController = (IFoo)filterContext.Controller;

		fooController.Context.Dispose();
	}
}

FooFilterProvider.cs

public class FooFilterProvider : IFilterProvider
{
	public IEnumerable<Filter> GetFilters(ControllerContext controllerContext, ActionDescriptor actionDescriptor)
	{
		if (!(controllerContext.Controller is IFoo))
		{
			yield break;
		}

		yield return new Filter(new FooActionFilter(), FilterScope.Global, 1);
	}
}

IFoo.cs

public interface IFoo
{
	IFooContext Context { get; set; }
}

IFooContext.cs

public interface IFooContext : IDisposable
{
	void DoFoo();
}