ASP.NET Core MVC Interview Question #90

What are MVC filters?

Advanced Routing, Filters, Areas & Application Structure Mid-Level Intermediate

Quick Interview Answer

MVC filters are components that run at defined stages around MVC action execution. They support cross-cutting concerns that are specific to MVC, such as authorization, resource handling, action execution, exception handling, and result processing.

Detailed Explanation

Filters can be applied globally, to a controller, or to individual actions. They should be used when the concern belongs to the MVC execution pipeline rather than the broader ASP.NET Core middleware pipeline.

Code Example

public class ProductsController : Controller
{
    [ServiceFilter(typeof(AuditActionFilter))]
    public IActionResult Edit(int id)
    {
        return View();
    }
}