[转载]Asp.NET MVC Widget开发 - ViewEngine

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[转载]Asp.NET MVC Widget开发 – ViewEngine – Creative dream – 博客园.

ASP.NET开发博客类系统,我们经常都会用到Widget,像在线好友、最近访问 好友、最新留言等,关于ASP.NET MVC与Asp.NET视图的差异,这里不再说了,大家可去查一下,接下来我以“我的好友”列表来要介绍在Asp.NET MVC实现这一功能以及结构设计。

  • 开发工具:VS 2010 EN
  • 开发语言:Visual C#
  • ASP.NET MVC 3
  1. Asp.NET MVC Widget – 设计
  2. Asp.NET MVC Widget – Controller控制器
  3. Asp.NET MVC Widget – ViewEngine
  4. Asp.NET MVC Widget – Mobile支持

关于ViewEngine这篇是Widgets实现的核心,这里需要自定义ASP.NET MVC的视图引擎,也就是让Asp.NET MVC视图引擎可以找到widgets中的文件。

直接访问会出现以下错误,提示找不到显示文件

由错误中也可以看到 Asp.NET MVC默认引擎搜索文件的目录

/Views/Widget/

/Views/Shared/

要寻找到”widgets”中的文件就必须要让视图引擎去”widgets”中搜索文件

如Friends: /widgets/Friends/

添加自定义视图引擎

1. 添加 “WidgetViewEngine.cs”,继承自BuildManagerViewEngine

using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.Mvc; namespace Widgets { public class WidgetViewEngine : BuildManagerViewEngine { internal static readonly string ViewStartFileName = "_ViewStart"; public WidgetViewEngine() : this(null) { } public WidgetViewEngine(IViewPageActivator viewPageActivator) : base(viewPageActivator) { AreaViewLocationFormats = new[] { "~/Areas/{2}/Views/{1}/{0}.cshtml", "~/Areas/{2}/Views/Shared/{0}.cshtml" }; AreaMasterLocationFormats = new[] { "~/Areas/{2}/Views/{1}/{0}.cshtml", "~/Areas/{2}/Views/Shared/{0}.cshtml" }; AreaPartialViewLocationFormats = new[] { "~/Areas/{2}/Views/{1}/{0}.cshtml", "~/Areas/{2}/Views/Shared/{0}.cshtml" }; ViewLocationFormats = new[] { "~/Views/{1}/{0}.cshtml", "~/Views/Shared/{0}.cshtml" }; MasterLocationFormats = new[] { "~/Views/{1}/{0}.cshtml", "~/Views/Shared/{0}.cshtml" }; PartialViewLocationFormats = new[] { "~/{1}s/{0}/Widget.cshtml", "~/Views/{1}/{0}.cshtml", "~/Views/Shared/{0}.cshtml" }; FileExtensions = new[] { "cshtml" }; } protected override IView CreatePartialView(ControllerContext controllerContext, string partialPath) { return new RazorView(controllerContext, partialPath, layoutPath: null, runViewStartPages: false, viewStartFileExtensions: FileExtensions, viewPageActivator: ViewPageActivator); } protected override IView CreateView(ControllerContext controllerContext, string viewPath, string masterPath) { var view = new RazorView(controllerContext, viewPath, layoutPath: masterPath, runViewStartPages: true, viewStartFileExtensions: FileExtensions, viewPageActivator: ViewPageActivator); return view; } } }

2. 添加AppStart_Widgets.cs,修改默认视图引擎

using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.Mvc; using Widgets; [assembly: PreApplicationStartMethod(typeof(AppStart_Widgets), "Start")] namespace Widgets { public class AppStart_Widgets { public static void Start() { // Clear system default view engines ViewEngines.Engines.Clear(); ViewEngines.Engines.Add(new WidgetViewEngine()); } } }

3. 添加Friend实体及测试数据

using System; using System.Collections.Generic; using System.Linq; using System.Web; namespace Widgets.Models { public class Friend { public int Id { get; set; } public string Name { get; set; } } public class FriendsContext { public FriendsContext() { Friends = new List<Friend>() { new Friend{Id=1,Name="zhang san"}, new Friend{Id=2,Name="li si"}, new Friend{Id=3,Name="wang wu"} }; } public IEnumerable<Friend> Friends { get; private set; } } }

4. 更改widgets/Friends/Widget.cshtml

@model IEnumerable<Widgets.Models.Friend> @{ Layout = "~/widgets/_Layout.cshtml"; ViewBag.Title = "My friends"; } <div class="newsletter"> <ul> @foreach (var item in Model) { <li>@item.Name</li> } </ul> </div>

项目结构

其它代码详见源码中。

再次访问,便出现要的结果。

源码下载

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