上次面试，遇到，在项目中如何处理业务异常和代码异常，使用txt记录异常信息后，如何直接区分出异常的类型，异常怎么分类处理，希望大家能帮我提出宝贵的意见，完善处理异常，
统一返回参数
???
???public class HeaderResult???{ ???????public HeaderResult() ???????{ ???????????// ReSharper disable once VirtualMemberCallInConstructor ???????????IsSucceed = false; ???????} ????????????public virtual bool IsSucceed { get; set; } ??????????????public virtual string Message { get; set; } ?????????????public virtual T Result { get; set; } ??????????????public virtual string StatusCode { get; set; } ???} ???
创建一个过滤器
在过滤器中拦截异常信息，使用Log4net 记录日志到txt中，获取到异常信息统一返回给前端
???public class ProjectExceptionFilter : IExceptionFilter { ???public void OnException(ExceptionContext context) ???{ ???????????????Exception exception = context.Exception; ???????var exceptionType = exception.GetType().ToString(); ???????if (exceptionType == "ProjectCore.Common.DomainException") ???????{ ???????????//用来分类处理业务逻辑 ???????} ???????//获取controller的名称 ???????var controller = context.RouteData.Values["controller"].ToString(); ???????//获取Action的名称 ???????var action = context.RouteData.Values["Action"].ToString(); ???????var errorPath = controller + "/" + action; ???????LogHelper.LogError("web service error:" + errorPath, exception); ??????????????????//返回异常信息给前端 ???????context.Result = new JsonResult(new HeaderResult<string> ???????{ ???????????Message = "错误路径:" + errorPath + ":错误信息" + exception.Message+"", ???????????IsSucceed = false ???????}); ????????????????//异常已处理了 ???????context.ExceptionHandled = true; ?????????????}}</pre>
使用Log4net 记录日志到txt中 log4net.config网上有许多，这里就不贴出来了
???public static class LogHelper{ ???private static ILog _logger; ???static LogHelper() ???{ ???????ILoggerRepository repository = LogManager.CreateRepository("NETCoreRepository"); ???????XmlConfigurator.Configure(repository, new FileInfo("log4net.config")); ?????????????????LogHelper._logger = LogManager.GetLogger(repository.Name, "NETCorelog4net"); ???} ???public static void LogError(string msg, Exception ex) ???{ ???????string errorMsg = string.Format("【抛出信息】：{0} <br/>【异常类型】：{1} <br/>【异常信息】：{2} <br/>【堆栈调用】：{3}", new object[] { msg, ???????ex.GetType().Name, ex.Message, ex.StackTrace }); ???????errorMsg = errorMsg.Replace("\r\n", "<br>"); ???????errorMsg = errorMsg.Replace("位置", "<strong style=\"color:red\">位置</strong>"); ????????????????LogHelper._logger.Error(errorMsg); ???} ???public static void LogInfo(string msg) ???{ ???????LogHelper._logger.Info((object)msg); ???} ???public static void LogDebug(string msg) ???{ ???????LogHelper._logger.Debug((object)msg); ???}}</pre>
在Startup 下面配置
??????services.AddMvc(options => ???????{ ???????????options.Filters.Add(typeof(ProjectExceptionFilter)); ?????????????????????????options.Filters.Add(typeof(ModelVerificationFilter)); ?????????????????????}). ??????????SetCompatibilityVersion(CompatibilityVersion.Version_2_1). ???????????AddJsonOptions(options => ???????????{ ???????????????//忽略循环引用 ???????????????options.SerializerSettings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore; ???????????????//不使用驼峰样式的key ???????????????options.SerializerSettings.ContractResolver = new DefaultContractResolver(); ???????????????//设置时间格式 ???????????????options.SerializerSettings.DateFormatString = "yyyy-MM-dd"; ???????????});</pre>
第三节：使用Log4net和过滤器记录异常信息，返回异常给前端
原文地址：https://www.cnblogs.com/lifeng618/p/9630570.html