有时候，我们的项目涉及到多种风格，我们可以通过扩展RazorViewEngine，这样就可以保持后台代码不发生变化。
新建类ThemeViewEngine继承于RazorViewEngine
1 public class ThemeViewEngine : RazorViewEngine 2 { 3 public ThemeViewEngine(string theme) 4 { 5 ViewLocationFormats = new[] 6 { 7 "~/Views/Themes/" + theme + "/{1}/{0}.cshtml", 8 "~/Views/Themes/" + theme + "/Shared/{0}.cshtml" 9 }; 10 11 PartialViewLocationFormats = new[] 12 { 13 "~/Views/Themes/" + theme + "/{1}/{0}.cshtml", 14 "~/Views/Themes/" + theme + "/Shared/{0}.cshtml" 15 }; 16 17 AreaViewLocationFormats = new[] 18 { 19 "~Areas/{2}/Views/Themes/" + theme + "/{1}/{0}.cshtml", 20 "~Areas/{2}/Views/Themes/" + theme + "/Shared/{0}.cshtml" 21 }; 22 23 AreaPartialViewLocationFormats = new[] 24 { 25 "~Areas/{2}/Views/Themes/" + theme + "/{1}/{0}.cshtml", 26 "~Areas/{2}/Views/Themes/" + theme + "/Shared/{0}.cshtml" 27 }; 28 } 29 }
Global类中，注册这种引擎
1 //不同风格 2 if (!string.IsNullOrEmpty(ConfigurationManager.AppSettings["Theme"])) 3 { 4 var activeTheme = ConfigurationManager.AppSettings["Theme"]; 5 ViewEngines.Engines.Insert(0, new ThemeViewEngine(activeTheme)); 6 }
web.config配置具体风格：
1 <add key="Theme" value="China" />
项目文件结构：
View:
America:
1 @{ 2 ViewBag.Title = "ShowTheme"; 3 } 4 5 <h2>ShowTheme America</h2>
China:
1 @{ 2 ViewBag.Title = "ShowTheme"; 3 } 4 5 <h2>ShowTheme China</h2>
运行：
1 public ActionResult ShowTheme() 2 { 3 return View(); 4 }
效果图: