Filter attribute in mvc

 

In ASP.NET Core MVC, filters (like ActionFilterAttribute) let you run logic before or after controller actions. They're great for cross-cutting concerns like logging, authentication, or validation.

 

In-Build Filters

• Authorization Filter
  • Interface/Base Class - IAuthorizationFilter
  • Run: Before everything
• Resource Filter
  • Interface/Base Class - IResourceFilter
  • Run: Before model binding
• Action Filter
  • Interface/Base Class - IActionFilter / ActionFilterAttribute
  • Run: Before/after action executes
• Exception Filter
  • Interface/Base Class - IExceptionFilter
  • Run: On unhandled exceptions
• Result Filter
  • Interface/Base Class - IResultFilter
  • Run: Before/after action result runs

 

 

 

Create a Custom Filter Attribute

 

 

Apply the Filter

• Option A: Apply to a Controller or Action
  • 
• Option B: Register Globally (applies to all controllers/actions)
  • 
• Register the Filter in DI
  • 
• Directly without using DI
  •