在嵌套在子文件夹中的Partial中使用@model dynamic会引发RuntimeBinderException

Question

I'm having some problems finding a solution for this, though it seems straight-forward enough, and I imagine someone else must have run into this issue before.

Using MVC/Razor 4, I am trying to render a partial using a dynamic model. To organize things, I have placed my partials in a sub-folder within the same view folder.

When the partial in question is moved to the sub-folder, it throws a RuntimeBinderException with an exception message saying that 'object' does not contain a definition for 'Id' (the parameter I am trying to access).

This works perfectly fine when the partial is located in the same folder.

This structure works fine

• Views/Orders/Details.cshtml
• Views/Orders/_PartialWithDynamicModel.cshtml

This structure causes the exception

• Views/Orders/Details.cshtml
• Views/Orders/MyPartials/_PartialWithDynamicModel.cshtml

CODE

Details.cshtml

    @Html.Partial("MyPartials/_PartialWithDynamicModel", new { Id = 54 } )

_PartialWithDynamicModel.cshtml

    @model dynamic

    @ { //The following line throws the RuntimeBinderException
        int id = Model.Id; }

Any thoughts? If I move the partial into the same folder as the view, everything works fine.

Answer 1

Your problem is that you can't pass an anonymous type to an object in a separate assembly. They are created as "internal" types, and thus cannot be passed externally. Views are generated dynamically at runtime into their own assemblies.

Instead, use an ExpandoObject, like this:

@{ var myExpando = new ExpandoObject();
   myExpando.Id = 54; }
@Html.Partial("MyPartials/_PutOnHoldForm",  myExpando)

A better choice, however, would be to just pass a ViewDataDictionary, or perhaps use Tuples.

There is also the DynamicViewPage extension in the MVC futures project that allows you to do this as well without the expand object.

http://weblogs.asp.net/imranbaloch/using-the-features-of-asp-net-mvc-3-futures

(note, it says MVC3, but there is an MVC5 version of futures in Nuget)