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

 1 using System;
 2
 3 namespace System.Web.Mvc
 4 {
 5     // Summary:
 6     //     Represents the base class for filter attributes.
 7     [AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, Inherited = true, AllowMultiple = false)]
 8     public abstract class ActionFilterAttribute : FilterAttribute, IActionFilter, IResultFilter
 9     {
10         // Summary:
11         //     Initializes a new instance of the System.Web.Mvc.ActionFilterAttribute class.
12         protected ActionFilterAttribute();
13
14         // Summary:
15         //     Called by the ASP.NET MVC framework after the action method executes.
16         //
17         // Parameters:
18         //   filterContext:
19         //     The filter context.
20         public virtual void OnActionExecuted(ActionExecutedContext filterContext);
21         //
22         // Summary:
23         //     Called by the ASP.NET MVC framework before the action method executes.
24         //
25         // Parameters:
26         //   filterContext:
27         //     The filter context.
28         public virtual void OnActionExecuting(ActionExecutingContext filterContext);
29         //
30         // Summary:
31         //     Called by the ASP.NET MVC framework after the action result executes.
32         //
33         // Parameters:
34         //   filterContext:
35         //     The filter context.
36         public virtual void OnResultExecuted(ResultExecutedContext filterContext);
37         //
38         // Summary:
39         //     Called by the ASP.NET MVC framework before the action result executes.
40         //
41         // Parameters:
42         //   filterContext:
43         //     The filter context.
44         public virtual void OnResultExecuting(ResultExecutingContext filterContext);
45     }
46 }

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

 1 using System.Web.Mvc;
 2
 3 namespace MVC3.Demo.App_Code
 4 {
 5     public class LogActionFilter : ActionFilterAttribute
 6     {
 7         public string LogMessage { get; set; }
 8
 9         public override void OnActionExecuting(ActionExecutingContext filterContext)
10         {
11             filterContext.HttpContext.Response.Write(@"在Action执行之前执行" + LogMessage + "<br />");
12             base.OnActionExecuting(filterContext);
13         }
14
15         public override void OnActionExecuted(ActionExecutedContext filterContext)
16         {
17             filterContext.HttpContext.Response.Write(@"在Action执行之后执行" + LogMessage + "<br />");
18             base.OnActionExecuted(filterContext);
19         }
20
21         public override void OnResultExecuting(ResultExecutingContext filterContext)
22         {
23             filterContext.HttpContext.Response.Write(@"在Result执行之前执行" + LogMessage + "<br />");
24             base.OnResultExecuting(filterContext);
25         }
26
27         public override void OnResultExecuted(ResultExecutedContext filterContext)
28         {
29             filterContext.HttpContext.Response.Write(@"在Result执行之后执行" + LogMessage + "<br />");
30             base.OnResultExecuted(filterContext);
31         }
32     }
33 }

2.使用

1         [LogActionFilter(LogMessage = "日志写入：Validation方法")]
2         public ActionResult Validation()
3         {
4             return View();
5         }

3.效果

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