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: