在这里简单给大家说下如何实现，只要给大家提供一点思路。其实把框架研究透彻了，真的很多问题都迎刃而解。

大家如果有看过我的上篇文章 ASP.NET MVC : 实现我们自己的视图引擎 ，其实就明白的了。

在这里，首先我们需要一个配置文件来配置站点要使用的模板(主题)。

Config/Site.config :

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

然后修改默认的ViewLocator  ：

public 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";

        /**//// 


        /// 加载XML文件

        /// 

        private XElement ConfigXml

        {

            get

            {

                if (configXml == null)

                {

                    configXml = XElement.Load(path);

                }

                return configXml;

            }

        }

    }
 

还有修改ViewEngine的ViewLocator 为刚才创建的uLinkViewLocator ：

public 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;

            }

        }

    }
  

然后创建一个ControllerFactory继承自默认的DefaultControllerFactory，以修改默认的controller中的ViewEngine为我们创建的uLinkViewEngine ：

public class uLinkControllerFactory : DefaultControllerFactory

    {

        protected override IController CreateController(RequestContext requestContext, string controllerName)

        {

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

            controller.ViewEngine = new uLinkViewEngine();//修改默认的视图引擎为我们刚才创建的视图引擎

            return controller;

        }



    }

在Global.asax.cs中的Application_Start 事件中注册我们的 uLinkControllerFactory ：

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

然后在写一个设置模板的Controller：

ThemeController

public class ThemeController : Controller

    {

        private XElement configXml;

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

        /**//// 


        /// 加载XML文件

        /// 

        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)


        

            

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