最近使用ASP.NET MVC 4.0，发现虽然可以自定义路由、视图的规则，但相对还是比较死板，

全部的Contorl都放一起，全部的Views都放一起，功能多的时候岂不乱七八糟，比如想按业务模块来划分功能代码，

ASP.NET MVC 2.0以后提供了Areas区域功能，可以让我们对代码进行分区分块，但这样的分区模式也还是不够灵活

呵，遂上网爬到自定义视图的方法，可惜自定义RazorViewEngine过程中，虽然运行时是成功的，开发中遇到各式各样的问题却不得而解

比如，新建一个CustomViewEngine.cs文件：

1 public class CustomViewEngine : RazorViewEngine 2 { 3     public CustomViewEngine() 4     { 5         ViewLocationFormats = 6         new string[]  7         {  8             "~/Views/{1}/{0}.cshtml", 9             "~/Views/{1}/Shared/{0}.cshtml",10             "~/Views/Shared/{0}.cshtml"11         };12         AreaViewLocationFormats = new[]13         {14             "~/Areas/{2}/Views/{1}/{0}.cshtml",15             "~/Areas/{2}/Views/Shared/{0}.cshtml",16 17             "~/Areas/Apps/{2}/Views/{1}/{0}.cshtml",18             "~/Areas/ERP/{2}/Views/{1}/{0}.cshtml",19             "~/Areas/OA/{2}/Views/{1}/{0}.cshtml",20 21             "~/Areas/Apps/{2}/Views/Shared/{0}.cshtml",22             "~/Areas/ERP/{2}/Views/Shared/{0}.cshtml",23             "~/Areas/OA/{2}/Views/Shared/{0}.cshtml"24         };25 26         PartialViewLocationFormats = ViewLocationFormats;27         AreaPartialViewLocationFormats = AreaViewLocationFormats;28     }29 }

然后，修改Global.asax.cs文件：

1 protected void Application_Start() 2 { 3     AreaRegistration.RegisterAllAreas(); 4     WebApiConfig.Register(GlobalConfiguration.Configuration); 5     FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters); 6     RouteConfig.RegisterRoutes(RouteTable.Routes); 7     BundleConfig.RegisterBundles(BundleTable.Bundles); 8  9     ViewEngines.Engines.Clear();                    // 清除原MVC视图引擎规则10     ViewEngines.Engines.Add(new CustomViewEngine());  // 使用自定义视图引擎规则11 }

经过上述改造，自定义RazorViewEngine视图引擎运行是成功了

但在控制器中“添加视图”位置就不对，用ReShaper添加也不对，添加后得手工再转移视图文件的位置，而“转到视图”功能则完全没的用了，提示“找不到匹配的视图”。

所以这样的自定义视图法，除了运行时成功和自己看着爽，VS开发工具和ReShaper插件均却告定位失败，

一句话总结：ASP.NET MVC的RazorViewEngine视图引擎自定义，真是让人哭笑不得，用之不爽，弃之可惜啊！