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POMVC Drop Down List not mapping to Model
 

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    <p>I'm trying to develop an application in MVC 3 using EF codefirst. When I use int properties and convention to set up foreign key relationships e.g. </p> <pre><code>public class Patient { public int ConsultantId {get;set;} } </code></pre> <p>I then setup an create and edit page and use the HTML.DropDownListFor Helper to produce a list of possible consultants </p> <pre><code> @Html.DropDownListFor(model =&gt; model.ConsultantId, ((IEnumerable&lt;Web.Models.Consultant&gt;)ViewBag.PossibleConsultants).Select(option =&gt; new SelectListItem { Text = Html.DisplayTextFor(_ =&gt; option.ConsultantName).ToString(), Value = option.ConsultantId.ToString(), Selected = (Model != null) &amp;&amp; (option.ConsultantId == Model.ConsultantId) }), "Choose...") </code></pre> <p>Which works fine, but I now want to move to having the Consultant object on the patient class e.g.</p> <pre><code> public class Patient { public virtual Consultant Consultant {get;set;} } public class Consultant { public virtual ICollection&lt;Patient&gt; Patient {get;set;} } </code></pre> <p>I now try to setup the view using the DropDownListfor but this time on the model.Consultant e.g.</p> <pre><code> @Html.DropDownListFor(model =&gt; model.Consultant, ((IEnumerable&lt;Web.Models.Consultant&gt;)ViewBag.PossibleConsultants).Select(option =&gt; new SelectListItem { Text = Html.DisplayTextFor(_ =&gt; option.ConsultantName).ToString(), Value = option.ConsultantId.ToString(), Selected = (Model != null) &amp;&amp; (option.ConsultantId == Model.Consultant.ConsultantId) }), "Choose...") </code></pre> <p>The create and edit page load correctly and the consultant is correctly selected on the edit page but when I post the page the ModelState is InValid on this error "Can't convert<br> 'System.String' to type 'Web.Models.Consultant". Does anyone know how to use the DropDownListFor so the Model can be mapped back to an object. </p>
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