Usage

public class AppHandleErrorAttribute : HandleErrorAttribute
{
    public override void OnException(ExceptionContext filterContext)
    {
        var json = new JsonResponse();
        json.success = false;
        var ex = filterContext.Exception;
        //deal custom exception…
        json.message = "系统异常，请联系管理员!";
        string msg = string.Format("系统异常:{0}", ex.Message);
        LogHelper.Error(msg, ex);   //Log4jNet
        
filterContext.ExceptionHandled = true;
        var result = new JsonResult();
        result.Data = json;
        result.JsonRequestBehavior = JsonRequestBehavior.AllowGet;
        filterContext.Result = result;
    }
}

public class FilterConfig
{
    public static void RegisterGlobalFilters(GlobalFilterCollection filters)
    {
        filters.Add(new AppHandleErrorAttribute());
    }
}