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  • ASP.NET MVC2.0 自定义filters

    今天大家共同学习下ASP.NET MVC2.0中自定义filters,这一节主要学习下ActionFilterAttribute，

        ActionFilterAttribute继承IActionFilter, IResultFilter接口,并且继承FilterAttribute类.

         ActionFilterAttribute可以监控action执行过程中所有阶段，包括日志，异常处理等功能.

          主要包括以下四个重载方法

           OnActionExecuting，OnActionExecuted，OnResultExecuting，OnResultExecuted

     

    1.OnActionExecuting是在action开始前执行

      用于身份验证和服务器端缓存输出

    2. OnActionExecuted在action结束后执行

    主要用于异常处理

    3. OnResultExecuting在返回result前执行

        主要用于设置客户端缓存和服务器端压缩

    4. OnResultExecuted在返回result后执行

       主要用于异常处理和页面尾部输出调试信息

    以下两个DEMO，将展示actionfilter的具体用法

       demo1:

            在这个DEMO中我们将展示action在各个阶段的执行时间，并在页面中输出。

            首先我们定义一个ActionLogAttribute类

         

    [csharp] view plaincopyprint?
    1. using System; 
    2. using System.Collections.Generic; 
    3. using System.Linq; 
    4. using System.Web; 
    5. using System.Web.Mvc; 
    6.  
    7. namespace MvcAppOne.ActionFilters 
    8. { 
    9.     publicclass ActionLogAttribute : ActionFilterAttribute 
    10.     { 
    11.         /// <summary> 
    12.         /// 表示actionID 
    13.         /// </summary> 
    14.         publicint ID 
    15.         { 
    16.             get; 
    17.             set; 
    18.         } 
    19.         /// <summary> 
    20.         /// 在 action开始前执行 
    21.         /// </summary> 
    22.         /// <param name="filterContext"></param> 
    23.         publicoverridevoid OnActionExecuting(ActionExecutingContext filterContext) 
    24.         { 
    25.             filterContext.RequestContext.HttpContext.Response.Write(ID.ToString()+":actinon开始执行" + DateTime.Now.ToString() + "<br/>"); 
    26.             base.OnActionExecuting(filterContext); 
    27.         } 
    28.  
    29.         /// <summary> 
    30.         /// 在action结束后执行 
    31.         /// </summary> 
    32.         /// <param name="filterContext"></param> 
    33.         publicoverridevoid OnActionExecuted(ActionExecutedContext filterContext) 
    34.         { 
    35.             filterContext.RequestContext.HttpContext.Response.Write(ID.ToString()+":actinon执行结束" + DateTime.Now.ToString() + "<br/>"); 
    36.             base.OnActionExecuted(filterContext); 
    37.         } 
    38.  
    39.         /// <summary> 
    40.         /// 在result开始前执行 
    41.         /// </summary> 
    42.         /// <param name="filterContext"></param> 
    43.         publicoverridevoid OnResultExecuting(ResultExecutingContext filterContext) 
    44.         { 
    45.             filterContext.RequestContext.HttpContext.Response.Write(ID.ToString()+":result执行开始" + DateTime.Now.ToString() + "<br/>"); 
    46.             base.OnResultExecuting(filterContext); 
    47.         } 
    48.  
    49.         /// <summary> 
    50.         /// 在result结束后执行 
    51.         /// </summary> 
    52.         /// <param name="filterContext"></param> 
    53.         publicoverridevoid OnResultExecuted(ResultExecutedContext filterContext) 
    54.         { 
    55.             filterContext.RequestContext.HttpContext.Response.Write(ID.ToString()+":result执行结束" + DateTime.Now.ToString() + "<br/>"); 
    56.             base.OnResultExecuted(filterContext); 
    57.         } 
    58.  
    59.     } 
    60. }  
    using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace MvcAppOne.ActionFilters
{
    public class ActionLogAttribute : ActionFilterAttribute
    {
        /// <summary>
        /// 表示actionID
        /// </summary>
        public int ID
        {
            get;
            set;
        }
        /// <summary>
        /// 在 action开始前执行
        /// </summary>
        /// <param name="filterContext"></param>
        public override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            filterContext.RequestContext.HttpContext.Response.Write(ID.ToString()+":actinon开始执行" + DateTime.Now.ToString() + "<br/>");
            base.OnActionExecuting(filterContext);
        }

        /// <summary>
        /// 在action结束后执行
        /// </summary>
        /// <param name="filterContext"></param>
        public override void OnActionExecuted(ActionExecutedContext filterContext)
        {
            filterContext.RequestContext.HttpContext.Response.Write(ID.ToString()+":actinon执行结束" + DateTime.Now.ToString() + "<br/>");
            base.OnActionExecuted(filterContext);
        }

        /// <summary>
        /// 在result开始前执行
        /// </summary>
        /// <param name="filterContext"></param>
        public override void OnResultExecuting(ResultExecutingContext filterContext)
        {
            filterContext.RequestContext.HttpContext.Response.Write(ID.ToString()+":result执行开始" + DateTime.Now.ToString() + "<br/>");
            base.OnResultExecuting(filterContext);
        }

        /// <summary>
        /// 在result结束后执行
        /// </summary>
        /// <param name="filterContext"></param>
        public override void OnResultExecuted(ResultExecutedContext filterContext)
        {
            filterContext.RequestContext.HttpContext.Response.Write(ID.ToString()+":result执行结束" + DateTime.Now.ToString() + "<br/>");
            base.OnResultExecuted(filterContext);
        }

    }
}

    然后我们建立一个VIEW页面，ShowNews页面

       然后再建立一个ACTION，并把属性标记在action上面

    [csharp] view plaincopyprint?
    1. [ActionFilters.ActionLog(ID=3)] 
    2.        public ActionResult ShowNews() 
    3.        { 
    4.            return View(); 
    5.        }  
     [ActionFilters.ActionLog(ID=3)]
        public ActionResult ShowNews()
        {
            return View();
        }

      此时我们运行ShowNews页面，我们将看到如下效果

     

     

    demo2: 接着我们看第二个DEMO,在这个demo中，我们将展现actionFILTER中各个方法的作用

                   我们建一个类 ActionDealAttribute

     

    [csharp] view plaincopyprint?
    1. publicclass ActionDealAttribute : ActionFilterAttribute 
    2.     { 
    3.         publicoverridevoid OnActionExecuting(ActionExecutingContext filterContext) 
    4.         { 
    5.             //用户没有验证通过,转向登录页面 
    6.             if (!filterContext.RequestContext.HttpContext.User.Identity.IsAuthenticated) 
    7.             { 
    8.                 filterContext.Result = new RedirectResult("../account/logon"); 
    9.             } 
    10.         } 
    11.  
    12.         publicoverridevoid OnActionExecuted(ActionExecutedContext filterContext) 
    13.         { 
    14.             //异常处理 
    15.             if (filterContext.Exception!=null) 
    16.             { 
    17.                 filterContext.ExceptionHandled=true; 
    18.                 filterContext.Result = new RedirectResult("../shared/Error");//转向错误页面 
    19.             } 
    20.  
    21.         } 
    22.  
    23.         publicoverridevoid OnResultExecuting(ResultExecutingContext filterContext) 
    24.         { 
    25.             base.OnResultExecuting(filterContext); 
    26.         } 
    27.  
    28.         publicoverridevoid OnResultExecuted(ResultExecutedContext filterContext) 
    29.         { 
    30.             base.OnResultExecuted(filterContext); 
    31.         } 
    32.  
    33.     }  
    public class ActionDealAttribute : ActionFilterAttribute
    {
        public override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            //用户没有验证通过,转向登录页面
            if (!filterContext.RequestContext.HttpContext.User.Identity.IsAuthenticated)
            {
                filterContext.Result = new RedirectResult("../account/logon");
            }
        }

        public override void OnActionExecuted(ActionExecutedContext filterContext)
        {
            //异常处理
            if (filterContext.Exception!=null)
            {
                filterContext.ExceptionHandled=true;
                filterContext.Result = new RedirectResult("../shared/Error");//转向错误页面
            }

        }

        public override void OnResultExecuting(ResultExecutingContext filterContext)
        {
            base.OnResultExecuting(filterContext);
        }

        public override void OnResultExecuted(ResultExecutedContext filterContext)
        {
            base.OnResultExecuted(filterContext);
        }

    }

      再建立一个news页面，并建立一个对应的action

      如果访问news页面需要登录才能访问，就在news对应的action标记此属性，在OnActionExecuting中进行处理

    [csharp] view plaincopyprint?
    1. [ActionFilters.ActionDeal] 
    2.         public ActionResult News() 
    3.         { 
    4.             return View(); 
    5.         }  
    [ActionFilters.ActionDeal]
        public ActionResult News()
        {
            return View();
        }

    如果news页面访问的时候出现异常，就会转向错误页面，在OnActionExecuted中进行处理

    [csharp] view plaincopyprint?
    1. [ActionFilters.ActionDeal] 
    2. publicvoid News() 
    3. { 
    4.     thrownew Exception(); 
    5. }  
            [ActionFilters.ActionDeal]
        public void News()
        {
            throw new Exception();
        }

    以上只是自定义action的简单用法，供大家参考。

    代码下载:http://download.csdn.net/detail/zx13525079024/4375094
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  • 原文地址：https://www.cnblogs.com/itjeff/p/3359431.html
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