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
     
              {            Message = "错误路径:" + errorPath + ":错误信息" + exception.Message+"",            IsSucceed = false        });                 //异常已处理了        context.ExceptionHandled = true;              }}
     

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} 
【异常类型】：{1} 
【异常信息】：{2} 
【堆栈调用】：{3}", new object[] { msg,        ex.GetType().Name, ex.Message, ex.StackTrace });        errorMsg = errorMsg.Replace("\r\n", "
");        errorMsg = errorMsg.Replace("位置", "位置");                 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);    }}

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";            });