在global里捕获黄页并写入异常日志库

可以在global文件中的application_error()中，记录用户操作中出现的异常日志

         protected   void  Application_Error(Object sender, EventArgs e)
     {
            try
            {
                Exception exception = HttpContext.Current.Server.GetLastError();
                // 如果有异常，则记录异常
                if (exception != null)
                {
                    exception = exception.GetBaseException();
                    log4net.ILog log = log4net.LogManager.GetLogger("ErrorLogFileAppender");
    
                    //先注释掉，用于开发调试之用
                    // 保存异常记录
                    System.Text.StringBuilder errorMessage = new System.Text.StringBuilder();
                    errorMessage.Append(Environment.NewLine);
                    errorMessage.Append("异常消息:");
                    errorMessage.Append(exception.Message);
                    errorMessage.Append(Environment.NewLine);
    
                    errorMessage.Append("异常用户:");
                    errorMessage.Append(Environment.NewLine);
    
                    errorMessage.Append("异常时间:");
                    errorMessage.Append(System.DateTime.Now.ToString());
                    errorMessage.Append(Environment.NewLine);
    
                    errorMessage.Append("异常位置:");
                    errorMessage.Append(Environment.NewLine);
                    errorMessage.Append(exception.StackTrace);
                    errorMessage.Append(Environment.NewLine);

                    OperationLogBL logBl = new OperationLogBL();
                    OperationLogData data = new OperationLogData();
                    data.OperateDate    = DateTime.Now;
                    data.OperatorId        = CurrentUser.Info.UserID;
                    data.OperatorName    = CurrentUser.Info.UserName;
                    data.OperatorEnName    = CurrentUser.Info.UserNameEn;
                    data.TypeNo            = (int)Model.LogType.错误日志;
                    data.Remark            = errorMessage.ToString();
                    data.ModifiedId        = exception.Source;
                    data.ModifiedItem    = Request.UserHostAddress;
                    data.OldValue        = Request.RawUrl.ToString();
                    logBl.Add(data);
                } // end if (exception != null)
            }
            catch (Exception ex)
            {
                System.Diagnostics.Debug.WriteLine(ex.Message);
            }
                  // 跳转至 [异常提示] 页面
                  if (ConfigurationSettings.AppSettings["EnableErrorPage"].ToLower() == "true")
                  {
                    string url = ConfigurationSettings.AppSettings["NoRightRedirect"];
                    Response.Redirect(url);
                  }
        }

net的错误机制处理：

。<customErrors> 配置节支持内部 <error> 标记，该标记将 HTTP 状态代码与自定义错误页关联。例如：

< configuration >   
< system .web >     
< customErrors  mode ="RemoteOnly"  defaultRedirect ="/genericerror.htm" >        < error  statusCode ="500"  redirect ="/error/callsupport.htm" />        < error  statusCode ="404"  redirect ="/error/notfound.aspx" />       
< error  statusCode ="403"  redirect ="/error/noaccess.aspx" />      </ customErrors >    </ system.web ></ configuration > mode   

mode:指示自定义错误是启用、禁用还是只向远程计算机显示。值：On、Off、RemoteOnly（默认值）。