MVC Filter Basic use

Action Filter

/// <summary>///Execute before executing code/// </summary>/// <param name= "Filtercontext" ></param> Public Override voidonactionexecuting (ActionExecutingContext filtercontext) {//1. Display the name of the action method that triggered the filter 　　 stringActionName =FilterContext.ActionDescriptor.ActionName; FilterContext.HttpContext.Response.Write ("actionname="+ ActionName +"</br>"); //2. Display the controller that triggered the filter action method 　　 stringCtrlname =FilterContext.ActionDescriptor.ControllerDescriptor.ControllerName; FilterContext.HttpContext.Response.Write ("controllername="+ Ctrlname +"</br>"); //3. Determine if the current action method is affixed with the [HttpGet] attribute label 　　 BOOLIsTrue = filterContext.ActionDescriptor.IsDefined (typeof(Httpgetattribute),false); FilterContext.HttpContext.Response.Write ("whether the current action is affixed with [HttpGet] attributes"+ IsTrue +"</br>"); //4. Get an instance with the [HttpGet] attribute label on the current action method 　　 Object[] Httpgets = FilterContext.ActionDescriptor.GetCustomAttributes (typeof(Httpgetattribute),false); foreach(ObjectObjinchhttpgets) {FilterContext.HttpContext.Response.Write ("gets an instance of the current action method that is affixed with the [HttpGet] attribute label:"+ obj. ToString () +"</br>"); }//5. Record the actual parameters of the current action methodparameterdescriptor[] Dics =filterContext.ActionDescriptor.GetParameters (); foreach(Parameterdescriptor dicinchdics) {//Print the action parameter nameFilterContext.HttpContext.Response.Write ("record the actual parameters of the current action method:"+ DIC. Parametername.tostring () +"</br>"); }Base. OnActionExecuting (Filtercontext);}/// <summary>///Execute after executing code/// </summary>/// <param name= "Filtercontext" ></param> Public Override voidonactionexecuted (ActionExecutedContext filtercontext) {Base. OnActionExecuted (Filtercontext);}/// <summary>///execute before returning results/// </summary>/// <param name= "Filtercontext" ></param> Public Override voidonresultexecuting (ResultExecutingContext filtercontext) {Base. Onresultexecuting (Filtercontext);}/// <summary>///executes after returning the result/// </summary>/// <param name= "Filtercontext" ></param> Public Override voidonresultexecuted (ResultExecutedContext filtercontext) {Base. Onresultexecuted (Filtercontext);}

  Exception Filters:Handleerrorattribute

 Public Override void onexception (Exceptioncontext filtercontext) {    //1. Get exception object    Exception ex=  filtercontext.exception;     // 2. Write an exception to    the log // 2.1 The specific implementation process of writing to the log is slightly    ... // 3. Tell the MVC framework that the filter has handled the exception and that no additional processing    is required true ;     Base . Onexception (Filtercontext);}

  Configuration Error page:

1 <customErrorsMode= "On"defaultredirect= "Error">2     <ErrorStatusCode= "404"redirect= "~/errormgr/p404" />3     <ErrorStatusCode= "$"redirect= "~/errormgr/p500"/>4 </customErrors>