c# - 异常过滤器在 web api 中不起作用

Question

我有一个自定义异常过滤器能够处理 Controller 中的所有错误(只是一个常见的错误处理机制)，

public class ExceptionHandlingAttribute : ExceptionFilterAttribute
    {
        public override void OnException(HttpActionExecutedContext actionExecutedContext)
        {
            var error = actionExecutedContext.Exception;
            if (error is BussinessExcetion)
            {
                var exceptionBase = (BussinessExcetion)error;
                var code = (HttpStatusCode)exceptionBase.HttpExceptionCode;
                throw new HttpResponseException(new HttpResponseMessage(code)
                                                    {
                                                        Content = new StringContent(exceptionBase.Message),
                                                        ReasonPhrase = "Exception"

                                                        ,
                                                    });

            }

            // Now log the error

            /* Error logging */

            LoggingFactory.GetLogger().LogError(string.Format("Exception:{0} ||Stack trace:{1}", error.Message, error.StackTrace), error);



            throw new HttpResponseException(new HttpResponseMessage(HttpStatusCode.InternalServerError)
                                                {
                                                    Content = new StringContent("An error occurred, contact the support team."),
                                                    ReasonPhrase = "Critical Exception"
                                                });
        }
    }

我在 fillterConfig 文件中注册了这个过滤器

 public static void RegisterGlobalFilters(GlobalFilterCollection filters)
    {
        filters.Add(new ExceptionHandlingAttribute());
     filters.Add(new HandleErrorAttribute());

    }

但是我收到一个错误

给定的过滤器实例必须实现以下一个或多个过滤器接口(interface):IAuthorizationFilter、IActionFilter、IResultFilter、IExceptionFilter

我知道 ExceptionFilterAttribute 已经实现了 IExceptionFilter 过滤器。为什么我会收到此错误

Answer 1

为了使其工作，您需要实现 System.Web.Http.Filters.ExceptionFilterAttribute。

public class NotImplExceptionFilterAttribute : ExceptionFilterAttribute
{
    log4net.ILog log = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);

    public override void OnException(HttpActionExecutedContext context)
    {
        RequestData requestData = new RequestData(context.Request);

        log.Error("NotImplExceptionFilterAttribute", context.Exception);
            context.Response = new HttpResponseMessage(HttpStatusCode.NotImplemented);
    }
}

然后，在您的 WebApiConfig.cs 中，注册过滤器:

public static void Register(HttpConfiguration config)
    {
        config.Routes.MapHttpRoute(
            name: "DefaultApi",
            routeTemplate: "api/{controller}/{count}",
            defaults: new { count = RouteParameter.Optional }
        );

        config.Filters.Add(new NotImplExceptionFilterAttribute());
    }