MVC Learning Series-Filter Extension and mvcfilter Extension

MVC Learning Series-Filter Extension and mvcfilter Extension

In MVC, Filter can also be expanded. Here, I understand the Filter as AOP. I don't know any of you, so I have some high opinions...

First, four major MVC filter artifacts: IAuthorizationFilter, IActionFilter, IResultFilter, and IExceptionFilter.

Before that, install the Log4net log artifact:

Check the reference of the project.

Configuration File

1 <? Xml version = "1.0" encoding = "UTF-8"?> 2 <configuration> 3 <configSections> 4 <section name = "log4net" type = "log4net. config. log4NetConfigurationSectionHandler, log4net "/> 5 </configSections> 6 <log4net> 7 <appender name =" RollingLogFileAppender "type =" log4net. appender. rollingFileAppender "> 8 <! -- Log Path --> 9 <param name = "File" value = "D: \ App_Log \"/> 10 <! -- Whether to append logs to the file --> 11 <param name = "AppendToFile" value = "true"/> 12 <! -- Log Retention days --> 13 <param name = "MaxSizeRollBackups" value = "10"/> 14 <! -- Whether the log file name is fixed --> 15 <param name = "StaticLogFileName" value = "false"/> 16 <! -- Log file name format: 2008-08-31.log --> 17 <param name = "DatePattern" value = "yyyy-MM-dd & quot;. log & quot;"/> 18 <! -- Rolling logs by Date --> 19 <param name = "RollingStyle" value = "Date"/> 20 <layout type = "log4net. layout. patternLayout "> 21 <param name =" ConversionPattern "value =" % d [% t] %-5 p % c-% m % n % loggername "/> 22 </layout> 23 </appender> 24 <! -- Log displayed on the console --> 25 <appender name = "ColoredConsoleAppender" type = "log4net. appender. coloredConsoleAppender "> 26 <mapping> 27 <level value =" ERROR "/> 28 <foreColor value =" Red, highIntensity "/> 29 </mapping> 30 <mapping> 31 <level value =" Info "/> 32 <foreColor value =" Green "/> 33 </mapping> 34 <layout type = "log4net. layout. patternLayout "> 35 <conversionPattern value =" % n % date {HH: mm: ss, fff} [%-5 level] % m "/> 36 </l Ayout> 37 38 <filter type = "log4net. filter. levelRangeFilter "> 39 <param name =" LevelMin "value =" Info "/> 40 <param name =" LevelMax "value =" Fatal "/> 41 </filter> 42 </appender> 43 <root> 44 <! -- (High) OFF> FATAL> ERROR> WARN> INFO> DEBUG> ALL (low) --> 45 <level value = "all"/> 46 <appender-ref = "ColoredConsoleAppender"/> 47 <appender-ref = "RollingLogFileAppender"/> 48 </root> 49 </log4net> 50 <system. web> 51 <compilation debug = "true" targetFramework = "4.5.2"/> 52 Added the LogHelper help class.

 1  public class LogHelper 2     { 3         public static void WriteLog_Error(Type t, Exception ex) 4         { 5             log4net.ILog log = log4net.LogManager.GetLogger(t); 6             log.Error("Unhandled exception", ex); 7         } 8  9         public static void WriteLog_Error(Type t, string msg)10         {11             log4net.ILog log = log4net.LogManager.GetLogger(t);12             log.Error(msg);13         }14 15         public static void WriteLog_Info(Type t, string msg)16         {17             log4net.ILog log = log4net.LogManager.GetLogger(t);18             log.Info(msg);19         }20     }

Another important step is to declare in the Gobal class:

1 // load the configuration file 2 var logCfg = new FileInfo (AppDomain. CurrentDomain. BaseDirectory + "Log4Net. config"); 3 XmlConfigurator. ConfigureAndWatch (logCfg );

OK. Here, log4net is configured.

 

Now, I will extend the IExceptionFilter.

Create a Log4NetExceptionFilter class and inherit from the IExceptionFilter interface.

1 public class Log4NetExceptionFilter : IExceptionFilter2     {3         public void OnException(ExceptionContext filterContext)4         {5             LogHelper.WriteLog_Error(GetType(), filterContext.Exception);6         }7     }

Declare your exception handling in FilterConfig:

1 public class FilterConfig2 {3 public static void RegisterGlobalFilters (GlobalFilterCollection filters) 4 {5 // filters. add (new handleerrorattriters (); 6 // Add your own exception 7 filters. add (new Log4NetExceptionFilter (); 8} 9}

Test: manually add an exception in GetXmlResult of HomeController:

 1  public XmlResult GetXmlResult() 2         { 3             int a = 1; 4             int b = 0; 5             int c = a / b; 6  7             StudentViewModel viewModel = new StudentViewModel(); 8             viewModel.ID = "1"; 9             viewModel.Name ="Zhangsan";10             viewModel.Gender = "Man";11 12             return new XmlResult(viewModel);13         }

Result:

 

To introduce ActionFilterAttribute, there are two interfaces: IActionFilter and IResultFilter.

Therefore, the new MyActionFilterAttribute inherits from ActionFilterAttribute.

 1 public class MyActionFilterAttribute: ActionFilterAttribute 2     { 3         public override void OnActionExecuting(ActionExecutingContext filterContext) 4         { 5             LogHelper.WriteLog_Info(GetType(), "OnActionExecuting"); 6             base.OnActionExecuting(filterContext); 7         } 8         public override void OnActionExecuted(ActionExecutedContext filterContext) 9         {10             LogHelper.WriteLog_Info(GetType(), "OnActionExecuted");11             base.OnActionExecuted(filterContext);12         }13 14         public override void OnResultExecuting(ResultExecutingContext filterContext)15         {16             LogHelper.WriteLog_Info(GetType(), "OnResultExecuting");17             base.OnResultExecuting(filterContext);18         }19 20         public override void OnResultExecuted(ResultExecutedContext filterContext)21         {22             LogHelper.WriteLog_Info(GetType(), "OnResultExecuted");23             base.OnResultExecuted(filterContext);24         }25     }

Test: add the MyActionFilterAttribute feature to the GetXmlResult method of HomeController. Ps: The exception added manually has been removed.

  [MyActionFilterAttribute]        public XmlResult GetXmlResult()        {            StudentViewModel viewModel = new StudentViewModel();            viewModel.ID = "1";            viewModel.Name ="Zhangsan";            viewModel.Gender = "Man";            return new XmlResult(viewModel);        }

Result: