向ASP.NET Core3.1标准JSON BadRequest响应添加详细消息

public class CustomException : Exception
{
    public CustomException(string message) : base(message)
    {
    }
}

public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
    // ...

    app.UseExceptionHandler(errorApp =>
    {
        errorApp.Run(async context =>
        {
            context.Response.StatusCode = (int)HttpStatusCode.BadRequest;
            context.Response.ContentType = "application/json";

            var exception = context.Features.Get<IExceptionHandlerFeature>();
            if (exception != null)
            {
                var errorMessage = new
                {
                    message = exception.Error.Message,
                    details = exception.Error.StackTrace
                };

                var json = JsonConvert.SerializeObject(errorMessage);
                await context.Response.WriteAsync(json);
            }
        });
    });

    // ...
}

[ApiController]
[Route("api/[controller]")]
public class SampleController : ControllerBase
{
    [HttpGet]
    public IActionResult Get()
    {
        throw new CustomException("Something went wrong.");
    }
}