Using VirtualPathProvider to load ASP.NET MVC views from DLLs

问题

Based on this question here and using code found here I\'m trying to load views that are embedded resources in a separate DLL project, and the original question\'s author says he has had success doing this - but I can\'t get it to work as it seems the MVC view engine is intercepting the request and still looking at the file system for the view. Exception:

Server Error in \'/\' Application.
The view \'Index\' or its master could not be found. The following locations were searched:
~/Views/admin/Index.aspx
~/Views/admin/Index.ascx
~/Views/Shared/Index.aspx
~/Views/Shared/Index.ascx
~/App/Views/admin/Index.aspx
~/App/Views/admin/Index.ascx
~/App/Views/Shared/Index.aspx
~/App/Views/Shared/Index.ascx

I am using a CustomViewEngine, like Rob Connery\'s /App structure one as follows:

public class CustomViewEngine : WebFormViewEngine
    {
         public CustomViewEngine()
         {
             MasterLocationFormats = new[] { 
                \"~/App/Views/{1}/{0}.master\", 
                \"~/App/Views/Shared/{0}.master\" 
                };

             ViewLocationFormats = new[] { 
                \"~/App/Views/{1}/{0}.aspx\", 
                \"~/App/Views/{1}/{0}.ascx\", 
                \"~/App/Views/Shared/{0}.aspx\", 
                \"~/App/Views/Shared/{0}.ascx\" 
                };

             PartialViewLocationFormats = ViewLocationFormats;
         }
    }

Here are my routes:

    routes.IgnoreRoute(\"{resource}.axd/{*pathInfo}\");

    routes.MapRoute(\"Home\", \"\", new {controller = \"Page\", action = \"Index\", id = \"Default\"});
    routes.MapRoute(\"Default\", \"Page/{id}\", new { controller = \"Page\", action = \"Index\", id = \"\" });
    routes.MapRoute(\"Plugins\", \"plugin/{controller}/{action}\", new { controller = \"\", action = \"Index\", id = \"\" });
    routes.MapRoute(\"Error\", \"{*url}\", new { controller = \"Error\", action = \"ResourceNotFound404\" });

In my AssemblyResourceProvider I\'m checking to see if the path starts ~/plugin/ and then using the dll filename convention plugin.{controller}.dll

Any suggestions?

UPDATE: By the time the routed request for say http://localhost/plugin/admin is getting to the VirtualFileProvider it doesn\'t have any View attached at the end. So in the VirtualFileProvider\'s Open method the virtual path of ~/plugin/admin is being passed in when it should be ~/plugin/admin/Index.aspx as defined in my route above. Have I messed up my routes or am I right to be expecting this to happen?

回答1:

You must register your VirtualPathProvider within the Global.asax Application_Start handler.
You must call the view in your DLL using the special path like so: return View("~/Plugin/YOURDLL.dll/FULLNAME_YOUR_VIEW.aspx");

Here's an article with downloadable code sample that demonstrates this:

http://www.wynia.org/wordpress/2008/12/aspnet-mvc-plugins/

回答2:

The built-in WebFormsViewEngine uses VirtualPathProviders, so if you write a VPP and register it, you won't need to make any changes to the view engine.

来源：https://stackoverflow.com/questions/236972/using-virtualpathprovider-to-load-asp-net-mvc-views-from-dlls

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asp.net-mvc

virtualpathprovider