What are exception filters in ASP.NET Core?

What are exception filters in ASP.NET Core?

Exception filters in ASP.NET Core are components that allow you to handle exceptions globally or at a specific level in your application. They can be used to log errors, return custom error responses, or perform other actions when an exception occurs.

How do I implement an exception filter?

To implement an exception filter, you need to create a class that implements the IExceptionFilter interface and override the OnException method. Then, you can register your filter in the Startup.cs file.

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 response
        context.Result = new ObjectResult(new { error = "An error occurred." })
        {
            StatusCode = 500
        };
    }
}

You would then register this filter in your Startup.cs like this:

services.AddControllers(options =>
{
    options.Filters.Add<CustomExceptionFilter>();
});

What are the benefits of using exception filters?

Using exception filters helps in centralizing error handling, improving code maintainability, and providing consistent error responses across your application.