【Q.Lee.lulu】ASP.NET MVC: 修改ViewLocator來動態切換模板

在這裡簡單給大家說下如何實現，只要給大家提供一點思路。其實把框架研究透徹了，真的很多問題都迎刃而解。

大家如果有看過我的上篇文章 ASP.NET MVC : 實現我們自己的檢視引擎 ，其實就明白的了。

在這裡，首先我們需要一個配置檔案來配置站點要使用的模板(主題)。

Config/Site.config :

xml version="1.0" encoding="utf-8"?>
<site>
<appsetting ViewTheme="Default" />
site>

然後修改預設的ViewLocator  ：

<!--

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--&gtpublic class uLinkViewLocator : ViewLocator

    {

        public uLinkViewLocator()

        {

            base.ViewLocationFormats = new string[] { BaseviewPath + "/{1}/{0}.aspx",

                                                      BaseviewPath + "/{1}/{0}.aspx",

                                                      BaseviewPath + "/Shared/{0}.aspx",

                                                      BaseviewPath + "/Shared/{0}.aspx",

                                                      "~/Views/{1}/{0}.aspx",

                                                      "~/Views/{1}/{0}.aspx",

                                                      "~/Views/Shared/{0}.aspx",

                                                      "~/Views/Shared/{0}.aspx"

            };

        }



        private string _baseviewPath;

        private string BaseviewPath

        {

            get

            {

                if (string.IsNullOrEmpty(_baseviewPath))

                {

                    string viewTheme = ConfigXml.Element("appsetting").Attribute("ViewTheme").Value;

                    viewTheme = string.IsNullOrEmpty(viewTheme) ? "Default" : viewTheme;

                    _baseviewPath = "~/Views/" + viewTheme;

                }

                return _baseviewPath;

            }

        }



        private XElement configXml;

        private string path = System.Web.HttpRuntime.AppDomainAppPath + "/Config/Site.config";

        /**//// 


        /// 載入XML檔案

        /// 

        private XElement ConfigXml

        {

            get

            {

                if (configXml == null)

                {

                    configXml = XElement.Load(path);

                }

                return configXml;

            }

        }

    }
 

還有修改ViewEngine的ViewLocator 為剛才建立的uLinkViewLocator ：

<!--

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--&gtpublic class uLinkViewEngine : WebFormViewEngine

    {



        IViewLocator _viewLocator = null;



        protected override void RenderView(ViewContext viewContext)

        {

            base.ViewLocator = this.ViewLocator;

            base.RenderView(viewContext);

        }



        public IViewLocator ViewLocator

        {

            get

            {

                if (this._viewLocator == null)

                {

                    this._viewLocator = new uLinkViewLocator();

                }

                return this._viewLocator;

            }

            set

            {

                this._viewLocator = value;

            }

        }

    }
  

然後建立一個ControllerFactory繼承自預設的DefaultControllerFactory，以修改預設的controller中的ViewEngine為我們建立的uLinkViewEngine ：

<!--

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--&gtpublic class uLinkControllerFactory : DefaultControllerFactory

    {

        protected override IController CreateController(RequestContext requestContext, string controllerName)

        {

            Controller controller = (Controller)base.CreateController(requestContext, controllerName);

            controller.ViewEngine = new uLinkViewEngine();//修改預設的檢視引擎為我們剛才建立的檢視引擎

            return controller;

        }



    }

在Global.asax.cs中的Application_Start 事件中註冊我們的 uLinkControllerFactory ：

ControllerBuilder.Current.SetControllerFactory(typeof(uLinkControllerFactory));

然後在寫一個設定模板的Controller：

ThemeController

<!--

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--&gtpublic class ThemeController : Controller

    {

        private XElement configXml;

        private string path = System.Web.HttpRuntime.AppDomainAppPath + "/Config/Site.config";

        /**//// 


        /// 載入XML檔案

        /// 

        private XElement ConfigXml

        {

            get

            {

                if (configXml == null)

                {

                    configXml = XElement.Load(path);

                }

                return configXml;

            }

        }



        public ActionResult Index()

        {

            // Add action logic here

            throw new NotImplementedException();

        }



        public ActionResult ChangeTheme(string id)


                    

                                                    來自 “ ITPUB部落格 ” ，連結：http://blog.itpub.net/12639172/viewspace-406792/，如需轉載，請註明出處，否則將追究法律責任。