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POASP.NET MVC 3 HtmlHelper Exception does not recognize ModelMetadata on inherited interface
 

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    <p>After upgrading to MVC 3 RTM I get an exception where it previously worked.</p> <p>Here is the scenario. I have several objects that use the same underlying interfaces IActivity and IOwned. </p> <pre><code>IActivity implements IOwned (another interface) public interface IActivity:IOwned {...} public interface IOwned { int? AuthorId {get;set;} } </code></pre> <p>I have a partial view that uses IActivity for reuse from other concrete partials.</p> <p>Here is the definition of the Activity Partial.</p> <pre><code>&lt;%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl&lt;IActivity&gt;" %&gt; &lt;%: Html.HiddenFor(item =&gt; item.AuthorId) %&gt; </code></pre> <p>However, it throws an exception. It can not find AuthorId in the ModelMetadata.</p> <p>I am guessing that in the previous version it looked at the interfaces IActivity implemented.</p> <p>Any ideas, suggestions, short of duplicating similar interfaces everywhere?</p> <p>Copied the stack trace below.</p> <pre><code>[ArgumentException: The property IActivity.AuthorId could not be found.] System.Web.Mvc.AssociatedMetadataProvider.GetMetadataForProperty(Func`1 modelAccessor, Type containerType, String propertyName) +498313 System.Web.Mvc.ModelMetadata.GetMetadataFromProvider(Func`1 modelAccessor, Type modelType, String propertyName, Type containerType) +101 System.Web.Mvc.ModelMetadata.FromLambdaExpression(Expression`1 expression, ViewDataDictionary`1 viewData) +393 System.Web.Mvc.Html.InputExtensions.HiddenFor(HtmlHelper`1 htmlHelper, Expression`1 expression, IDictionary`2 htmlAttributes) +57 System.Web.Mvc.Html.InputExtensions.HiddenFor(HtmlHelper`1 htmlHelper, Expression`1 expression) +51 ASP.views_shared_activity_ascx.__Render__control1(HtmlTextWriter __w, Control parameterContainer) in c:\Users\...\Documents\Visual Studio 2010\Projects\ngen\trunk\...\Views\Shared\Activity.ascx:3 System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +109 System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +8 System.Web.UI.Control.Render(HtmlTextWriter writer) +10 System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27 System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +100 System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25 System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +208 System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +8 System.Web.UI.Page.Render(HtmlTextWriter writer) +29 System.Web.Mvc.ViewPage.Render(HtmlTextWriter writer) +43 System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27 System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +100 System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3060 </code></pre>
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    1. COhave you tried stepping through the framework code?
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    2. CONo, I have not step thru the Framework code. I was hoping not to ;) I think for now I can work around it by switching to <%: Html.Hidden("AuthorId") %> However this looks like a breaking change in the FX IMHO.
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