Filters in ASP.NET Core MVC provide a powerful way to execute code at specific points during the request processing pipeline. This enables developers to add functionality, such as logging, authorization, or exception handling, before or after specific stages in the request lifecycle. By using filters, you can fine-tune how and when certain actions take place within your application.
ASP.NET Core MVC offers a variety of built-in filters, each serving a distinct role and executing at different stages of the request pipeline. These filters cover a wide range of use cases, from handling authorization checks to executing actions based on results. You can also create custom filters to address specific needs in your application. Filters are organized into categories based on the stage of execution they correspond to, ensuring that the right code runs at the right time.
This article dives into the various types of filters available in ASP.NET Core MVC 5 and explores how they can be implemented to enhance your application. To follow along with the examples in this tutorial, ensure that you have Visual Studio 2019 installed. If you don’t already have it, you can download it from the official website.
To get started, we’ll create a new ASP.NET Core MVC project in Visual Studio 2019. Here’s a step-by-step guide to setting up your project: Launch Visual Studio, click on “Create new project,” and select “ASP.NET Core Web App (Model-View-Controller)” from the template list. After specifying the project name and location, make sure to choose .NET 5.0 as your target framework. You can leave the default settings for authentication and other features unchecked, as they are not needed for this example. Once you’ve created the project, we’ll begin exploring how to implement filters in the upcoming sections.