public class LogFilterAttribute : ActionFilterAttribute

    {

        private CommonService _commonService;

        public LogFilterAttribute()

        {

            _commonService = new CommonService();

        }

        /// <summary>

        /// Action执行后

        /// </summary>

        /// <param name="actionExecutedContext"></param>

        public override void OnActionExecuted(HttpActionExecutedContext actionExecutedContext)

        {

            if (actionExecutedContext.Exception != null)

            {

                var url = actionExecutedContext.ActionContext.Request.RequestUri;

                var param = actionExecutedContext.ActionContext.ActionArguments;

                var paramJson= Newtonsoft.Json.JsonConvert.SerializeObject(param);

                var error = $"Exception:{DateTime.Now}(ㄒoㄒ){url}(ㄒoㄒ){paramJson}(ㄒoㄒ){actionExecutedContext.Exception.Message}";

                _commonService.SaveLog(error);

            }

        }

    }

 public static void Register(HttpConfiguration config)

        {

            // Web API configuration and services

            // Configure Web API to use only bearer token authentication.

            config.SuppressDefaultHostAuthentication();

            config.Filters.Add(new HostAuthenticationFilter(OAuthDefaults.AuthenticationType));

            config.Filters.Add(new LogFilterAttribute());

            // Web API routes

            config.MapHttpAttributeRoutes();

            config.Routes.MapHttpRoute(

                name: "DefaultApi",

                routeTemplate: "api/{controller}/{id}",

                defaults: new { id = RouteParameter.Optional }

            );

            config.Routes.MapHttpRoute(

                name: "SwaggerIndex",

                routeTemplate: "{controller}/{action}/{id}",

                defaults: new { controller = "Home", action = "Index", id = RouteParameter.Optional }

            );

            var json = config.Formatters.JsonFormatter;

            json.SerializerSettings.PreserveReferencesHandling =

                Newtonsoft.Json.PreserveReferencesHandling.Objects;

            config.Formatters.Remove(config.Formatters.XmlFormatter);

        }