How to Register Exception Filters?

We can register a Web API exception filter:

• By action
• By controller
• Globally

To apply the exception filter to a controller action method:

public class EmployeeController : ApiController { [NotImplExceptionFilter] public Address GetAddress(int id) { throw new NotImplementedException("This method is not implemented"); } }

To apply the exception filter to a controller class:

[NotImplExceptionFilter]

public class EmployeeController : ApiController { public Address GetAddress(int id) { throw new NotImplementedException("This method is not implemented"); } }

To apply the exception filter globally to all Web API controllers:

public static class WebApiConfig

    {
        public static void Register(HttpConfiguration config)
        {
            // Web API configuration and services
 
            // Web API routes
 
            config.Filters.Add(new EmployeeDemoProject.NotImplExceptionFilterAttribute());
 
            config.MapHttpAttributeRoutes();
 
            config.Routes.MapHttpRoute(
                name: "DefaultApi",
                routeTemplate: "api/{controller}/{id}",
                defaults: new { id = RouteParameter.Optional }
            );
        }
    }