ASP.NET Core MVC Interview Question #100

What are best practices for MVC routing, Areas, filters, and application structure?

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

Quick Interview Answer

Keep public routes predictable and unambiguous, use constraints when they improve endpoint selection, and generate URLs through routing rather than hard-coding paths. Use Areas to organize genuinely large functional sections, but apply explicit authorization because an area is not a security boundary.

Detailed Explanation

Keep public routes predictable and unambiguous, use constraints when they improve endpoint selection, and generate URLs through routing rather than hard-coding paths. Use Areas to organize genuinely large functional sections, but apply explicit authorization because an area is not a security boundary.

Use filters only for cross-cutting behavior that belongs to the MVC execution pipeline. Prefer built-in authorization policies for access control and exception-handling middleware for broad error handling. Keep controllers small, move business logic into application services, use feature-oriented organization where helpful, and avoid hiding important business behavior inside routing conventions or filters.

Code Example

[Area("Admin")]
[Authorize(Policy = "AdminAccess")]
public class DashboardController : Controller
{
    [HttpGet]
    public IActionResult Index()
    {
        return View();
    }
}