ASP. net mvc unified log processing makes your application no longer see small yellow pages !, Asp. netmvc

ASP. net mvc unified log processing makes your application no longer see small yellow pages !, Asp. netmvc
Introduction

Exception Handling is a required function of every system. When a program fails, it does not display an inexplicable page or expose the stack information of your code! In ASP. net mvc, how does one correctly handle exceptions and record them?

The answer is that you can use ASP. net mvc Filter (Filter) to capture global exceptions using AOP.

 

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Let's talk about the source code.

Create a folder in the root directory of ASP. net mvc and name it Filter.

 

 

Create a new Class named CustomExceptionAttribute in the Filter and inherit the FilterAttribute Class and the IExceptionFilter interface.

As follows:

 

 

Below is the code

The Code thought is

 

 

 

 

/// <Summary> /// handle system exceptions in a centralized manner /// rewrite the official default HandleErrorAttribute processing /// </summary> public class CustomExceptionAttribute: FilterAttribute, IExceptionFilter {public void OnException (ExceptionContext filterContext) {// check whether an exception if (filterContext. predictionhandled = true) {// skipped return directly after processing;} else {// recorded log var log = new predictionlogmodel (); log. controllerName = (string) filterContext. routeData. values ["co Ntroller "]; // controller Name log. actionName = (string) filterContext. routeData. values ["action"]; // operation name log. loginUser = "temporary test user"; // user log for abnormal operations. url = filterContext. requestContext. httpContext. request. url. localPath; // url log of the exception. logLevel = LogLevel. error; // exception type log. source = filterContext. exception. source; // the log of the object that causes the exception. errorMsg = filterContext. exception. message; // exception details log. stackTrace = filterContext. excep Tion. stackTrace; // exception stack information log. exceptionLog ();} // check whether bool AjaxReq = filterContext is requested asynchronously. httpContext. request. isAjaxRequest (); // jump to the specified exception page var httpException = new HttpException (null, filterContext. exception); switch (httpException. getHttpCode () {case 400: if (! AjaxReq) {ViewResult result = new ViewResult {ViewName = "Page_400", // error page MasterName = null, // specify the master page ViewData = null, // specify the model TempData = filterContext. controller. tempData}; filterContext. result = result; filterContext. httpContext. response. clear (); filterContext. httpContext. response. statusCode = 400;} else {filterContext. result = new HttpStatusCodeResult (System. net. httpStatusCode. badRequest, fi LterContext. Exception. Message);} break; case 401: if (! AjaxReq) {ViewResult result = new ViewResult {ViewName = "Page_401", // error page MasterName = null, // specify the master page ViewData = null, // specify the model TempData = filterContext. controller. tempData}; filterContext. result = result; filterContext. httpContext. response. clear (); filterContext. httpContext. response. statusCode = 401;} else {filterContext. result = new HttpStatusCodeResult (System. net. httpStatusCode. unauthorized, "You Must login to perform this operation");} break; case 403: if (! AjaxReq) {ViewResult result = new ViewResult {ViewName = "Page_403", // error page MasterName = null, // specify the master page ViewData = null, // specify the model TempData = filterContext. controller. tempData}; filterContext. result = result; filterContext. httpContext. response. clear (); filterContext. httpContext. response. statusCode = 403;} else {filterContext. result = new HttpStatusCodeResult (System. net. httpStatusCode. forbidden, "Yo U do not have permission to access this operation ");} break; case 404: if (! AjaxReq) {ViewResult result = new ViewResult {ViewName = "Page_404", // error page MasterName = null, // specify the master page ViewData = null, // specify the model TempData = filterContext. controller. tempData // temporary data}; filterContext. result = result; filterContext. httpContext. response. clear (); filterContext. httpContext. response. statusCode = 404;} else {filterContext. result = new HttpStatusCodeResult (System. net. httpStatusCode. notFoun D, "The requested resource was not found");} break; case 500: if (! AjaxReq) {ViewResult result = new ViewResult {ViewName = "Page_500", // error page MasterName = null, // specify the master page ViewData = null, // specify the model TempData = filterContext. controller. tempData}; filterContext. result = result; filterContext. httpContext. response. clear (); filterContext. httpContext. response. statusCode = 500;} else {filterContext. result = new HttpStatusCodeResult (System. net. httpStatusCode. internalServer Error, filterContext. Exception. Message);} break; default: if (! AjaxReq) {ViewResult result = new ViewResult {ViewName = "Page_500", // error page MasterName = null, // specify the master page ViewData = null, // specify the model TempData = filterContext. controller. tempData}; filterContext. result = result; filterContext. httpContext. response. clear (); filterContext. httpContext. response. statusCode = 500;} else {filterContext. result = new HttpStatusCodeResult (System. net. httpStatusCode. internalServer Error, filterContext. exception. message);} break;} // The setting exception has been handled; otherwise, it will be overwritten by other exception filters. predictionhandled = true; // when you override a derived class, you can obtain or set a value that specifies whether to disable IIS custom errors. FilterContext. HttpContext. Response. TrySkipIisCustomErrors = true ;}

 

 

Finally, modify the content in the FilterConfig. CS file of the App_Start file under the root directory of the MVC project.

 

 

 

Now, all exceptions in your controller will be caught.