asp.net mvc 3.0 新特性之 Controller

介绍
asp.net mvc 之 asp.net mvc 3.0 新特性之 Controller：

  • Global Action Filter
  • 可以在标记为 ChildActionOnly 的 Action 上使用 OutputCache
  • ViewBag
  • 新增了一些 Action Result



示例
1、Global Action Filter 的 Demo
Global.asax.cs（注册全局的 Action Filter）

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protected void Application_Start()
{
    AreaRegistration.RegisterAllAreas();
    RegisterRoutes(RouteTable.Routes);
  
    /*
     * 演示 Global Action Filter
     */
  
    // 实例化一个 Filter
    var handleError = new HandleErrorAttribute();
    // 指定 HandleErrorAttribute 的 View
    handleError.View = "Error2";
    // Order 属性的默认值为：-1，即不会被应用，所以这里要修改一下
    handleError.Order = 0;
  
    // 将 Filter 对象添加到全局 Filters 集合中
    GlobalFilters.Filters.Add(handleError);
}


Web.config

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<system.web>
          
    <!--
        如果需要启用 HandleError ，那么要在 web.config 中做如下配置：<customErrors mode="On" />   
    -->
    <customErrors mode="On" />
      
</system.web>


ControllerDemoController.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
  
namespace MVC30.Controllers
{
    public class ControllerDemoController : Controller
    {
        // 用于演示 Global Action Filter
        public ActionResult GlobalActionFilter()
        {
            throw new Exception("exception");
        }
    }
}


GlobalActionFilter.cshtml（访问此页会抛出异常，然后跳转到Error2）

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@{
    ViewBag.Title = "Global Action Filter";
}
  
<h2>GlobalActionFilter</h2>


Error2.cshtml（自定义错误页）

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@{
    Layout = null;
}
  
<!DOCTYPE html>
<html>
<head>
    <title>Error</title>
</head>
<body>
    <!--
        HTTP 返回 500 时，页面必须输出足够多的信息才会显示，否则只会显示 IE 的 HTTP 500 默认页
    -->
    <h2>
        Sorry, an error occurred while processing your request
    </h2>
    <h2>
        Sorry, an error occurred while processing your request
    </h2>
    <h2>
        Sorry, an error occurred while processing your request
    </h2>
    <h2>
        Sorry, an error occurred while processing your request
    </h2>
    <h2>
        Sorry, an error occurred while processing your request
    </h2>
</body>
</html>



2、标记为 ChildActionOnly 的 Action 支持 OutputCache
ControllerDemoController.cs

view sourceprint?
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
  
namespace MVC30.Controllers
{
    public class ControllerDemoController : Controller
    {
        public ActionResult ChildActionOnlyDemo()
        {
            return View();
        }
  
        // ChildActionOnly - 指定 Action 只能让 RenderAction 调用
        // OutputCache() - 缓存。Duration - 缓存秒数。VaryByParam - none, *, 多个参数用逗号隔开。也可以通过配置文件对缓存做设置
        [ChildActionOnly]
        [OutputCache(Duration = 5)]
        public PartialViewResult _GetCurrentTime()
        {
            var currentTime = DateTime.Now;
  
            return PartialView(currentTime);
        }
    }
}


_GetCurrentTime.cshtml

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@*
    通过 @model 指定 Model 的类型，同时 Model 对象就是 Action 返回的数据
*@
  
@model DateTime
  
<div>
    currentTime: @Model.ToString("yyyy-MM-dd HH:mm:ss")
</div>


ChildActionOnlyDemo.cshtml

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@{
    ViewBag.Title = "可以在标记为 ChildActionOnly 的 Action 上使用 OutputCache";
}
  
<h2>ChildActionOnlyDemo</h2>
  
<div>
    @{ Html.RenderAction("_GetCurrentTime"); }
    <!--
        <% Html.RenderAction("_GetCurrentTime"); %>
    -->
</div>
  
<div>
    @Html.Action("_GetCurrentTime")
    <!--
        <%= Html.Action("_GetCurrentTime") %>
    -->
</div>
  
 <!--
    Html.Action 与 Html.RenderAction 的区别：
        Html.Action - 直接将 Action 的结果作为一个字符串输出
        Html.RenderAction - 将 Action 作为一个用户控件嵌入到当前的 HttpContext 中
 -->

 

3、 新增了 ViewBag
ControllerDemoController.cs

view sourceprint?
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
  
namespace MVC30.Controllers
{
    public class ControllerDemoController : Controller
    {
        // 用于 ViewBagDemo
        public ActionResult ViewBagDemo()
        {
            // ViewBag 的本质就是把 ViewData 包装成为 dynamic 类型
            ViewBag.Message = "ViewBag 的 Demo";
  
            return View();
        }
    }
}


ViewBagDemo.cshtml

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@{
    ViewBag.Title = "ViewBag";
}
  
<h2>ViewBag</h2>
  
Message: @ViewBag.Message



4、 新增的 Action Result

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<p>
    Controller 中新增了一些 Action Result: HttpNotFoundResult, HttpRedirectResult, HttpStatusCodeResult
</p>



posted @ 2011-10-14 15:35  lixiaojin  阅读(547)  评论(0)    收藏  举报