在MVC中添加异常增加日志

MVC的结构非常棒，基本你能想到注入的地方都可以找到地方，譬如IActionFilter，IResultFilter，IAuthorizationFilter以及IExceptionFilter

以下是测试过比较好的通用异常处理

public virtual void OnException(ExceptionContext filterContext)
        {
            if (filterContext.IsChildAction)
                return;

            if (filterContext.ExceptionHandled || !filterContext.HttpContext.IsCustomErrorEnabled)
                return;

            var statusCode = (int)HttpStatusCode.InternalServerError;
            if (filterContext.Exception is HttpException)
            {
                var httpException = filterContext.Exception as HttpException;
                statusCode = httpException.GetHttpCode();
            }
            else if (filterContext.Exception is UnauthorizedAccessException)
            {
                statusCode = (int)HttpStatusCode.Forbidden;
            }

            //记录日志
            _logger.Error("未捕获的异常", filterContext.Exception);

            if (filterContext.RequestContext.HttpContext.Request.IsAjaxRequest())
            {
                ReturnStatus status = new ReturnStatus
                {
                    Status = false,
                    //Todo:json错误类型分类模板
                    ErrorMessage = filterContext.Exception.Message,
                    Url = "/"
                };
                JsonResult jsonResult = new JsonResult();
                jsonResult.Data = status;
                jsonResult.JsonRequestBehavior = JsonRequestBehavior.AllowGet;
                filterContext.Result = jsonResult;
            }
            else
            {
                var result = CreateActionResult(filterContext, statusCode);
                filterContext.Result = result;
            }

            filterContext.ExceptionHandled = true;
            filterContext.HttpContext.Response.Clear();
            filterContext.HttpContext.Response.StatusCode = statusCode;
            filterContext.HttpContext.Response.TrySkipIisCustomErrors = true;
        }