ASP.NET MVC：自定义RazorViewEngine视图引擎

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：

public class CustomViewEngine : RazorViewEngine
{
    public CustomViewEngine()
    {
        ViewLocationFormats =
        new string[] 
        { 
            "~/Views/{1}/{0}.cshtml",
            "~/Views/{1}/Shared/{0}.cshtml",
            "~/Views/Shared/{0}.cshtml"
        };
        AreaViewLocationFormats = new[]
        {
            "~/Areas/{2}/Views/{1}/{0}.cshtml",
            "~/Areas/{2}/Views/Shared/{0}.cshtml",

            "~/Areas/Apps/{2}/Views/{1}/{0}.cshtml",
            "~/Areas/ERP/{2}/Views/{1}/{0}.cshtml",
            "~/Areas/OA/{2}/Views/{1}/{0}.cshtml",

            "~/Areas/Apps/{2}/Views/Shared/{0}.cshtml",
            "~/Areas/ERP/{2}/Views/Shared/{0}.cshtml",
            "~/Areas/OA/{2}/Views/Shared/{0}.cshtml"
        };

        PartialViewLocationFormats = ViewLocationFormats;
        AreaPartialViewLocationFormats = AreaViewLocationFormats;
    }
}

然后，修改Global.asax.cs文件：

protected void Application_Start()
{
    AreaRegistration.RegisterAllAreas();
    WebApiConfig.Register(GlobalConfiguration.Configuration);
    FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
    RouteConfig.RegisterRoutes(RouteTable.Routes);
    BundleConfig.RegisterBundles(BundleTable.Bundles);

    ViewEngines.Engines.Clear();                    // 清除原MVC视图引擎规则
    ViewEngines.Engines.Add(new CustomViewEngine());  // 使用自定义视图引擎规则
}

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！