.NET Core Web API - Custom Exception Filter Attribute

Startup.cs

// Startup.cs
public class Startup
{
    public void ConfigureServices(IServiceCollection services)
    {
        // Code to apply ExceptionHandlingFilter
        services.AddControllers(options =>
        {
            options.Filters.Add(typeof(CustomExceptionFilterAttribute));
        });
    }
    
    public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
    {
        // Some code to set request processing pipeline
    }
}

// Custom implementation for Exception Filter
public class CustomExceptionFilterAttribute : ExceptionFilterAttribute
{
    private readonly ILogger<CustomExceptionFilterAttribute> _logger;

    public CustomExceptionFilterAttribute(ILogger<CustomExceptionFilterAttribute> logger)
    {
        _logger = logger;
    }

    public override void OnException(ExceptionContext context)
    {
        base.OnException(context);

        // Some logic to handle specific exceptions
        var errorMessage = context.Exception is ArgumentException 
            ? "ArgumentException occurred" 
            : "Some unknown error occurred";

        // Maybe, logging the exception
        _logger.LogError(context.Exception, errorMessage);

        // Returning response
        context.Result = new BadRequestResult();
    }
}