Action filters in MVC

                                     Action filters in MVC

1. Create a New ASP.NET Core MVC Project: Open Visual Studio and create a new ASP.NET Core Web Application project. Choose the "ASP.NET Core Web Application" template and select "MVC" as the project type.

2. Create a Custom Action Filter: Create a custom action filter by implementing the IActionFilter, IAsyncActionFilter, IResultFilter, or IAsyncResultFilter interface based on your requirements. For this example, let's create a synchronous action filter.Register the Action Filter:

   You can register the action filter globally for all controllers or apply it selectively to specific controllers or action methods. For global registration, you can add the filter in the Startup.cs file inside the ConfigureServices method:
Apply the Action Filter: Apply the action filter to a controller or action method by using the [CustomActionFilter] attribute.

Run the Application: Run your application. When you navigate to the action method to which the action filter is applied, you'll see the messages printed by the action filter in the console.

1. Customize the Action Filter: You can customize the action filter according to your requirements. For example, you can access the action parameters, modify the action result, or handle exceptions within the action filter methods (OnActionExecuting and OnActionExecuted).

2. Testing: Test the behavior of your action filter thoroughly to ensure it behaves as expected under different scenarios.