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POCustom Model Binder inheriting from DefaultModelBinder
 

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    <p>I'm attempting to build a custom model binder for MVC 4 that will inherit from <code>DefaultModelBinder</code>. I'd like it to intercept any interfaces at <em>any</em> binding level and attempt to load the desired type from a hidden field called <code>AssemblyQualifiedName</code>.</p> <p>Here's what I have so far (simplified):</p> <pre><code>public class MyWebApplication : System.Web.HttpApplication { protected void Application_Start() { ModelBinders.Binders.DefaultBinder = new InterfaceModelBinder(); } } public class InterfaceModelBinder : DefaultModelBinder { public override object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext) { if (bindingContext.ModelType.IsInterface &amp;&amp; controllerContext.RequestContext.HttpContext.Request.Form.AllKeys.Contains("AssemblyQualifiedName")) { ModelBindingContext context = new ModelBindingContext(bindingContext); var item = Activator.CreateInstance( Type.GetType(controllerContext.RequestContext.HttpContext.Request.Form["AssemblyQualifiedName"])); Func&lt;object&gt; modelAccessor = () =&gt; item; context.ModelMetadata = new ModelMetadata(new DataAnnotationsModelMetadataProvider(), bindingContext.ModelMetadata.ContainerType, modelAccessor, item.GetType(), bindingContext.ModelName); return base.BindModel(controllerContext, context); } return base.BindModel(controllerContext, bindingContext); } } </code></pre> <p>Example Create.cshtml file (simplified):</p> <pre><code>@model Models.ScheduledJob @* Begin Form *@ @Html.Hidden("AssemblyQualifiedName", Model.Job.GetType().AssemblyQualifiedName) @Html.Partial("_JobParameters") @* End Form *@ </code></pre> <p>The above partial <code>_JobParameters.cshtml</code> looks at the <code>Model.Job</code>'s properties and builds the edit controls, similar to <code>@Html.EditorFor()</code>, but with some extra markup. The <code>ScheduledJob.Job</code> property is of type <code>IJob</code> (interface).</p> <p>Example ScheduledJobsController.cs (simplified):</p> <pre><code>[HttpPost] public ActionResult Create(ScheduledJob scheduledJob) { //scheduledJob.Job here is not null, but has only default values } </code></pre> <p>When I save the form, it interprets the object type correctly and gets a new instance, but the properties of the object are not being set to their appropriate values.</p> <p>What else do I need to do to this to tell the default binder to take over the property binding of the specified type?</p>
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