Unable to return exception details using ExceptionFilterAttribute

Question

I've a need to write exception filter for couple of controllers in .NET 6 and for that i've written below and when i do a postman i always get Error: Aborted which is weird

Code:

public class TestFilterAttribute : ExceptionFilterAttribute
{
    public override async void OnException(ExceptionContext context)
    {
        var info = { } //serialized object
        context.HttpContext.Response.ContentType = "appication/json";
        context.HttpContext.Response.StatusCode = 400;
        await context.HttpContext.Response.WriteAsync(info);
    }
} 

Registered:

services.AddSingleton<TestFilterAttribute>();

Decorated [TestFilter] on my api controller when i intentionally throw exception to check, i always get site cannot be reached. Same logic i've tried in middleware i properly get response in json with expected status code

Answer 1

Check this document related

You could try as below:

public class TestFilterAttribute : ExceptionFilterAttribute
    {
        public override async void OnException(ExceptionContext context)
        {
            context.Result = new BadRequestObjectResult(someobj);
           
           
        }
    }

Result:

Since you're trying with an attribute,you don't have to regist it in IServiceCollection

services.AddSingleton<TestFilterAttribute>();

You could check this document about child classes of ObjectResult