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ASP.NET MVC 修改视图的默认路径

本章将和大家分享如何在ASP.NET MVC中修改视图的默认路径。在此之前,首先我们要搞懂MVC它是怎么搜索视图的。

先来看下Demo的目录结构:

ASP.NET MVC 修改视图的默认路径

本Demo的Web项目为ASP.NET Web 应用程序(目标框架为.NET Framework 4.5) MVC项目。  

众所周知在Action中如果要返回一个页面,那我们一般的做法都是去调用View方法,如下所示:

ASP.NET MVC 修改视图的默认路径

接下来我们就通过反编译工具来看一下这个View方法里面到底都做了啥:

ASP.NET MVC 修改视图的默认路径

可以看到它最后返回的是 ViewResult 对象,我们继续通过反编译工具来看一下这个 ViewResult 类:

ASP.NET MVC 修改视图的默认路径

可以发现,它是从 base.ViewEngineCollection 中找默认视图的,下面我们继续通过反编译工具找到 base.ViewEngineCollection ,如下所示:

ASP.NET MVC 修改视图的默认路径

可以看到,其实它返回就是一个 ViewEngineCollection 视图引擎集合,并且它的取值来自 ViewEngines.Engines ,我们点击 Engines 往里找:

ASP.NET MVC 修改视图的默认路径

继续点击 _engines 往里找:

ASP.NET MVC 修改视图的默认路径

找到最后我们可以发现,其实 ViewEngines.Engines 里面存放的就是 new WebFormViewEngine() 和 new RazorViewEngine() 。

我们继续通过反编译工具找到 RazorViewEngine 这个类,如下所示:

using System;  namespace System.Web.Mvc {     /// <summary>Represents a view engine that is used to render a Web page that uses the ASP.NET Razor syntax.</summary>     public class RazorViewEngine : BuildManagerViewEngine     {         internal static readonly string ViewStartFileName = "_ViewStart";          /// <summary>Initializes a new instance of the <see cref="T:System.Web.Mvc.RazorViewEngine" /> class.</summary>         public RazorViewEngine() : this(null)         {         }          /// <summary>Initializes a new instance of the <see cref="T:System.Web.Mvc.RazorViewEngine" /> class using the view page activator.</summary>         /// <param name="viewPageActivator">The view page activator.</param>         public RazorViewEngine(IViewPageActivator viewPageActivator) : base(viewPageActivator)         {             base.AreaViewLocationFormats = new string[]             {                 "~/Areas/{2}/Views/{1}/{0}.cshtml",                 "~/Areas/{2}/Views/{1}/{0}.vbhtml",                 "~/Areas/{2}/Views/Shared/{0}.cshtml",                 "~/Areas/{2}/Views/Shared/{0}.vbhtml"             };             base.AreaMasterLocationFormats = new string[]             {                 "~/Areas/{2}/Views/{1}/{0}.cshtml",                 "~/Areas/{2}/Views/{1}/{0}.vbhtml",                 "~/Areas/{2}/Views/Shared/{0}.cshtml",                 "~/Areas/{2}/Views/Shared/{0}.vbhtml"             };             base.AreaPartialViewLocationFormats = new string[]             {                 "~/Areas/{2}/Views/{1}/{0}.cshtml",                 "~/Areas/{2}/Views/{1}/{0}.vbhtml",                 "~/Areas/{2}/Views/Shared/{0}.cshtml",                 "~/Areas/{2}/Views/Shared/{0}.vbhtml"             };             base.ViewLocationFormats = new string[]             {                 "~/Views/{1}/{0}.cshtml",                 "~/Views/{1}/{0}.vbhtml",                 "~/Views/Shared/{0}.cshtml",                 "~/Views/Shared/{0}.vbhtml"             };             base.MasterLocationFormats = new string[]             {                 "~/Views/{1}/{0}.cshtml",                 "~/Views/{1}/{0}.vbhtml",                 "~/Views/Shared/{0}.cshtml",                 "~/Views/Shared/{0}.vbhtml"             };             base.PartialViewLocationFormats = new string[]             {                 "~/Views/{1}/{0}.cshtml",                 "~/Views/{1}/{0}.vbhtml",                 "~/Views/Shared/{0}.cshtml",                 "~/Views/Shared/{0}.vbhtml"             };             base.FileExtensions = new string[]             {                 "cshtml",                 "vbhtml"             };         }          /// <summary>Creates a partial view using the specified controller context and partial path.</summary>         /// <returns>The partial view.</returns>         /// <param name="controllerContext">The controller context.</param>         /// <param name="partialPath">The path to the partial view.</param>         protected override IView CreatePartialView(ControllerContext controllerContext, string partialPath)         {             return new RazorView(controllerContext, partialPath, null, false, base.FileExtensions, base.ViewPageActivator)             {                 DisplayModeProvider = base.DisplayModeProvider             };         }          /// <summary>Creates a view by using the specified controller context and the paths of the view and master view.</summary>         /// <returns>The view.</returns>         /// <param name="controllerContext">The controller context.</param>         /// <param name="viewPath">The path to the view.</param>         /// <param name="masterPath">The path to the master view.</param>         protected override IView CreateView(ControllerContext controllerContext, string viewPath, string masterPath)         {             return new RazorView(controllerContext, viewPath, masterPath, true, base.FileExtensions, base.ViewPageActivator)             {                 DisplayModeProvider = base.DisplayModeProvider             };         }     } }

可以惊奇的发现,上面描述的路径就是我们MVC默认的视图路径。既然如此,那我们大概知道了,将来如果要做一些扩展(例如:修改MVC默认的视图路径),就可以从这个类入手。

话不多说,下面我们重点来看下如何修改MVC默认的视图路径?

首先我们先来验证下 ViewEngines.Engines 里面存放的到底是不是只有 new WebFormViewEngine() 和 new RazorViewEngine() ,如下所示:

ASP.NET MVC 修改视图的默认路径

我们调试 Global.asax 中 Application_Start 方法,可以发现 ViewEngines.Engines 里面存的确实只有 new WebFormViewEngine() 和 new RazorViewEngine() ,那么下面我们就可以大胆的去扩展了。

自定义一个Razor视图引擎,如下所示:

using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.Mvc;  namespace ViewEngineExtend.ViewEngineExtend {     /// <summary>     /// 自定义Razor视图引擎     /// </summary>     public class CustomRazorViewEngine : RazorViewEngine     {         #region 构造函数          public CustomRazorViewEngine()             : this(null)         {          }          public CustomRazorViewEngine(IViewPageActivator viewPageActivator)             : base(viewPageActivator)         {          }          #endregion 构造函数          public override ViewEngineResult FindView(ControllerContext controllerContext, string viewName, string masterName, bool useCache)         {             if (controllerContext.HttpContext.Request.UserAgent.Contains("Chrome"))             {                 this.SetTheme("Chrome");             }             else             {                 this.SetTheme(""); //一定得有,因为只有一个Engines实例             }              return base.FindView(controllerContext, viewName, masterName, useCache);         }          public override ViewEngineResult FindPartialView(ControllerContext controllerContext, string partialViewName, bool useCache)         {             if (controllerContext.HttpContext.Request.UserAgent.Contains("Chrome"))             {                 this.SetTheme("Chrome");             }             else             {                 this.SetTheme(""); //一定得有,因为只有一个Engines实例             }              return base.FindPartialView(controllerContext, partialViewName, useCache);         }          /// <summary>         /// 设置主题(修改视图的默认路径)         /// </summary>         /// <param name="browser">浏览器</param>         void SetTheme(string browser)         {             if (!string.IsNullOrEmpty(browser) && browser.Contains("Chrome"))             {                 base.AreaViewLocationFormats = new string[]                 {                     "~/Areas/{2}/ChromeViews/{1}/{0}.cshtml",                     "~/Areas/{2}/ChromeViews/{1}/{0}.vbhtml",                     "~/Areas/{2}/ChromeViews/Shared/{0}.cshtml",                     "~/Areas/{2}/ChromeViews/Shared/{0}.vbhtml"                 };                 base.AreaMasterLocationFormats = new string[]                 {                     "~/Areas/{2}/ChromeViews/{1}/{0}.cshtml",                     "~/Areas/{2}/ChromeViews/{1}/{0}.vbhtml",                     "~/Areas/{2}/ChromeViews/Shared/{0}.cshtml",                     "~/Areas/{2}/ChromeViews/Shared/{0}.vbhtml"                 };                 base.AreaPartialViewLocationFormats = new string[]                 {                     "~/Areas/{2}/ChromeViews/{1}/{0}.cshtml",                     "~/Areas/{2}/ChromeViews/{1}/{0}.vbhtml",                     "~/Areas/{2}/ChromeViews/Shared/{0}.cshtml",                     "~/Areas/{2}/ChromeViews/Shared/{0}.vbhtml"                 };                 base.ViewLocationFormats = new string[]                 {                     "~/ChromeViews/{1}/{0}.cshtml",                     "~/ChromeViews/{1}/{0}.vbhtml",                     "~/ChromeViews/Shared/{0}.cshtml",                     "~/ChromeViews/Shared/{0}.vbhtml"                 };                 base.MasterLocationFormats = new string[]                 {                     "~/ChromeViews/{1}/{0}.cshtml",                     "~/ChromeViews/{1}/{0}.vbhtml",                     "~/ChromeViews/Shared/{0}.cshtml",                     "~/ChromeViews/Shared/{0}.vbhtml"                 };                 base.PartialViewLocationFormats = new string[]                 {                     "~/ChromeViews/{1}/{0}.cshtml",                     "~/ChromeViews/{1}/{0}.vbhtml",                     "~/ChromeViews/Shared/{0}.cshtml",                     "~/ChromeViews/Shared/{0}.vbhtml"                 };             }             else             {                 base.AreaViewLocationFormats = new string[]                 {                     "~/Areas/{2}/Views/{1}/{0}.cshtml",                     "~/Areas/{2}/Views/{1}/{0}.vbhtml",                     "~/Areas/{2}/Views/Shared/{0}.cshtml",                     "~/Areas/{2}/Views/Shared/{0}.vbhtml"                 };                 base.AreaMasterLocationFormats = new string[]                 {                     "~/Areas/{2}/Views/{1}/{0}.cshtml",                     "~/Areas/{2}/Views/{1}/{0}.vbhtml",                     "~/Areas/{2}/Views/Shared/{0}.cshtml",                     "~/Areas/{2}/Views/Shared/{0}.vbhtml"                 };                 base.AreaPartialViewLocationFormats = new string[]                 {                     "~/Areas/{2}/Views/{1}/{0}.cshtml",                     "~/Areas/{2}/Views/{1}/{0}.vbhtml",                     "~/Areas/{2}/Views/Shared/{0}.cshtml",                     "~/Areas/{2}/Views/Shared/{0}.vbhtml"                 };                 base.ViewLocationFormats = new string[]                 {                     "~/Views/{1}/{0}.cshtml",                     "~/Views/{1}/{0}.vbhtml",                     "~/Views/Shared/{0}.cshtml",                     "~/Views/Shared/{0}.vbhtml"                 };                 base.MasterLocationFormats = new string[]                 {                     "~/Views/{1}/{0}.cshtml",                     "~/Views/{1}/{0}.vbhtml",                     "~/Views/Shared/{0}.cshtml",                     "~/Views/Shared/{0}.vbhtml"                 };                 base.PartialViewLocationFormats = new string[]                 {                     "~/Views/{1}/{0}.cshtml",                     "~/Views/{1}/{0}.vbhtml",                     "~/Views/Shared/{0}.cshtml",                     "~/Views/Shared/{0}.vbhtml"                 };                 //base.FileExtensions = new string[]                 //{                 //    "cshtml",                 //    "vbhtml"                 //};             }         }     } }

接着修改 Global.asax 中 Application_Start 方法,将默认的 RazorViewEngine 替换成自定义的 CustomRazorViewEngine ,如下所示:

using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.Mvc; using System.Web.Optimization; using System.Web.Routing;  using ViewEngineExtend.ViewEngineExtend;  namespace ViewEngineExtend {     public class MvcApplication : System.Web.HttpApplication     {         protected void Application_Start()         {             AreaRegistration.RegisterAllAreas();             FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);             RouteConfig.RegisterRoutes(RouteTable.Routes);             BundleConfig.RegisterBundles(BundleTable.Bundles);              //var viewEngineCollection = ViewEngines.Engines;             ViewEngines.Engines.Clear();             ViewEngines.Engines.Add(new WebFormViewEngine());             ViewEngines.Engines.Add(new CustomRazorViewEngine()); //替换成自定义的Razor视图引擎         }     } }

此外,Demo中还准备了两套视图:

ASP.NET MVC 修改视图的默认路径

其中 ~/ChromeViews/Home/Index.cshtml 代码如下所示: 

@{     ViewBag.Title = "Home Page"; }  <h1>This is ChromeViews/Home/Index</h1>

其中 ~/Views/Home/Index.cshtml 代码如下所示: 

@{     ViewBag.Title = "Home Page"; }  <h1>This is Views/Home/Index</h1>

最后,我们分别使用 谷歌浏览器和IE浏览器 来访问 /Home/Index 页面,如下所示:

谷歌浏览器运行结果如下:

ASP.NET MVC 修改视图的默认路径

IE浏览器运行结果如下:

ASP.NET MVC 修改视图的默认路径

可以发现这两个浏览器的运行结果是不一样的,说明我们的视图引擎扩展成功了。 

至此本文就全部介绍完了,如果觉得对您有所启发请记得点个赞哦!!! 

 

Demo源码:

链接:https://pan.baidu.com/s/1TWVlsq98Sjt6qYOMXaTwCQ  提取码:3nm2

此文由博主精心撰写转载请保留此原文链接:https://www.cnblogs.com/xyh9039/p/15240321.html

版权声明:如有雷同纯属巧合,如有侵权请及时联系本人修改,谢谢!!!

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