MVC之Control中使用AOP

原文转载自http://www.cnblogs.com/iamlilinfeng/archive/2013/03/02/2940162.html

本文目标

一、能够使用Control中的AOP实现非业务需求的功能

本文目录

一、ActionFilterAttribute类

二、实现自定义Attribute

一、ActionFilterAttribute类

Action筛选条件的基类

 using System;

 namespace System.Web.Mvc
 {
     // Summary:
     //     Represents the base class for filter attributes.
     [AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, Inherited = true, AllowMultiple = false)]
     public abstract class ActionFilterAttribute : FilterAttribute, IActionFilter, IResultFilter
     {
         // Summary:
         //     Initializes a new instance of the System.Web.Mvc.ActionFilterAttribute class.
         protected ActionFilterAttribute();

         // Summary:
         //     Called by the ASP.NET MVC framework after the action method executes.
         //
         // Parameters:
         //   filterContext:
         //     The filter context.
         public virtual void OnActionExecuted(ActionExecutedContext filterContext);
         //
         // Summary:
         //     Called by the ASP.NET MVC framework before the action method executes.
         //
         // Parameters:
         //   filterContext:
         //     The filter context.
         public virtual void OnActionExecuting(ActionExecutingContext filterContext);
         //
         // Summary:
         //     Called by the ASP.NET MVC framework after the action result executes.
         //
         // Parameters:
         //   filterContext:
         //     The filter context.
         public virtual void OnResultExecuted(ResultExecutedContext filterContext);
         //
         // Summary:
         //     Called by the ASP.NET MVC framework before the action result executes.
         //
         // Parameters:
         //   filterContext:
         //     The filter context.
         public virtual void OnResultExecuting(ResultExecutingContext filterContext);
     }
 }

OnActionExecuting：在Action执行之前执行该方法

OnActionExecuted：在Action执行之后执行该方法

OnResultExecuting：在Result执行之前执行该方法

OnResultExecuted：在Result执行之后执行该方法

二、实现自定义Attribute

在MVC框架基础上实现自定义Attribute只需实现ActionFilterAttribute中的虚方法即可

1.代码

 using System.Web.Mvc;

 namespace MVC3.Demo.App_Code
 {
     public class LogActionFilter : ActionFilterAttribute
     {
         public string LogMessage { get; set; }

         public override void OnActionExecuting(ActionExecutingContext filterContext)
         {
             filterContext.HttpContext.Response.Write(@"在Action执行之前执行" + LogMessage + "<br />");
             base.OnActionExecuting(filterContext);
         }

         public override void OnActionExecuted(ActionExecutedContext filterContext)
         {
             filterContext.HttpContext.Response.Write(@"在Action执行之后执行" + LogMessage + "<br />");
             base.OnActionExecuted(filterContext);
         }

         public override void OnResultExecuting(ResultExecutingContext filterContext)
         {
             filterContext.HttpContext.Response.Write(@"在Result执行之前执行" + LogMessage + "<br />");
             base.OnResultExecuting(filterContext);
         }

         public override void OnResultExecuted(ResultExecutedContext filterContext)
         {
             filterContext.HttpContext.Response.Write(@"在Result执行之后执行" + LogMessage + "<br />");
             base.OnResultExecuted(filterContext);
         }
     }
 }

2.使用

 [LogActionFilter(LogMessage = "日志写入：Validation方法")]
          public ActionResult Validation()
          {
              return View();
          }

3.效果