ASP.NET MVC View / Partial with generics

Question

I wrote a List`1 editor template for use with the EditorFor (MVC2) extension methods, however I ran into problems when using generics + null objects.

Given the model

class MyModel {
   public Foo SomeFoo { get;set; }
   public List<Foo> SomeFooList { get;set; }
 }

and template in / Views / Shared / EditorTemplates / List `1.ascx

<%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl" %>

<%
    IEnumerable enumerableModel;
    if (Model != null && (enumerableModel = Model as IEnumerable) != null)
    {
        foreach (var v in enumerableModel)
        {
            var model = v;
            Response.Write(Html.EditorFor(m => model));
        }
    }
%>

I get the expected editor for SomeFoo and any SomeFooList elements that are not null, since the type in ModelMetaData will be "Foo". However, if I have “zero” as one of the objects in SomeFooList, I get nothing, because the model is of type “object”, and not Foo or the more general T from my general list arguments.

Essentially, I would like to achieve something like

<%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<IEnumerable<T>> where T : class" %>

so I know the types of my list.

ModelMetaData.ModelType null ( , ), , .

EditorFor .Invoke typeof (T) , , , .

?

Update:

, . , , , , , :

if (Model != null && (enumerableModel = Model as IEnumerable) != null)
    {
        Type listType = null;

        if (enumerableModel.GetType().IsGenericType)
        {
            listType = enumerableModel.GetType().GetGenericArguments()[0];
        }

        foreach (var v in enumerableModel)
        {
            var model = v;
            if (model == null && listType != null)
                model = Activator.CreateInstance(listType);
            Response.Write(Html.EditorFor(m => model));
        }
    }

Answer 1

, , Nullable<T>, ? Nullable<T> , T , . , HasValue, null .