What are exception filters in ASP.NET MVC?

What are exception filters in ASP.NET MVC?

Exception filters in ASP.NET MVC are used to handle exceptions that occur during the execution of a controller action. They allow you to centralize error handling logic and provide a way to log errors or return custom error responses.

How do I implement an exception filter?

To implement an exception filter, you can create a class that inherits from the IExceptionFilter interface and override the OnException method. Then, register the filter globally or apply it to specific controllers or actions.

Can you show me a code example?

Sure! Here's a simple example:

public class CustomExceptionFilter : IExceptionFilter
{
    public void OnException(ExceptionContext context)
    {
        // Log the exception
        // Return a custom error response
        context.Result = new JsonResult(new { error = "An error occurred." });
        context.ExceptionHandled = true;
    }
}

You can register this filter in Global.asax or use the [ServiceFilter] attribute.

What are the benefits of using exception filters?

The benefits include centralized error handling, improved code maintainability, and the ability to provide consistent error responses across your application.