Hands-On RESTful Web Services with ASP.NET Core 3

Concrete filter implementations

In general, filters can be implemented by extending the built-in types provided by ASP.NET Core. Let's walk through a simple declaration of a custom action filter:

using Microsoft.AspNetCore.Mvc.Filters;namespace SampleAPI.Filters{        public class CustomActionFilter : IActionFilter        {            public void OnActionExecuting(ActionExecutingContext context)            {                // do something before the action executes            }            public void OnActionExecuted(ActionExecutedContext context)            {                // do something after the action executes            }        }}

The CustomActionFilter class implements the IActionFilter interface type, which offers two different methods:

• The OnActionExecuting method is triggered before the execution of the action.
• The OnActionExecuted method ...