ASP.NET Core MVC 2.0 Cookbook

How to do it...

We'll understand the IActionFilter interface, TypeFilter, and ServiceFilter attributes by applying a dependency injection into a controller.

1. First, let's create an ActionFilter class only by deriving from IActionFilter:

public class MyActionFilter : IActionFilter{  public void OnActionExecuting(ActionExecutingContext context)  {    // do something before the action executes  }  public void OnActionExecuted(ActionExecutedContext context)  {    // do something after the action executes  }}

2. To use this class as an attribute, we have to use a TypeFilter attribute, and give it this class as a parameter. We can't use MyActionFilter directly as an attribute, because it doesn't inherit from ActionFilterAttribute:

[TypeFilter(typeof(MyActionFilter))] ...