custom error pages for non existent controllers in apiController

Question

I have created a MVC web API with MVC 5 controller for managing CRUD operations.

Here is the snippet of my API controller:

 public class UserController : ApiController
    {// GET api/<controller>
        public IEnumerable<User> GetAllUsers()
        {
            UserRepository urepo = new UserRepository();
            return urepo.UserList(0);
        }

        public User GetUserByID(int userID)
        {
            UserRepository urepo = new UserRepository();
            var userDetails = urepo.UserList(userID);  

            return (from n in userDetails where n.UserId == userID select n).SingleOrDefault();
        } }

and here is my WebAPIconfig file

public static void Register(HttpConfiguration config)
    {
        // Web API configuration and services

        // Web API routes
        config.MapHttpAttributeRoutes();

        config.Routes.MapHttpRoute(
            name: "DefaultApi",
            routeTemplate: "api/{controller}/{action}/{id}",
            defaults: new { id = RouteParameter.Optional }
        );
    }

When I access this controller from URL say localhost/api/User/GetAllUsers it is returning all users as expected.

But if i try to access in other way say localhost/api/User which is not there , will throw file not found error and show default error page.

what i need is instead of this default error page custom error page need to be displayed. How this can be achieved?

Answer 1

Let's say that you are developing a HTTP RESTful application using ASP.NET Web API framework. In this application you need to handle HTTP 404 errors in a centralized location. This Blog might help you in finding what you need.

Handling HTTP 404 Error in ASP.NET Web API