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    copied!<p><strong>Update:</strong> Example now uses a AJAX JSON POST</p> <p>If you must use an abstract type, you could provide a <a href="http://msdn.microsoft.com/en-us/library/system.web.mvc.imodelbinder.aspx" rel="noreferrer">custom model binder</a> to create the concrete instance. An example is shown below:</p> <p><strong>Model / Model Binder</strong></p> <pre><code>public abstract class Student { public abstract int Age { get; set; } public abstract string Name { get; set; } } public class GoodStudent : Student { public override int Age { get; set; } public override string Name { get; set; } } public class BadStudent : Student { public override int Age { get; set; } public override string Name { get; set; } } public class StudentBinder : IModelBinder { public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext) { var values = (ValueProviderCollection) bindingContext.ValueProvider; var age = (int) values.GetValue("Age").ConvertTo(typeof (int)); var name = (string) values.GetValue("Name").ConvertTo(typeof(string)); return age &gt; 10 ? (Student) new GoodStudent { Age = age, Name = name } : new BadStudent { Age = age, Name = name }; } } </code></pre> <p><strong>Controller Actions</strong></p> <pre><code>public ActionResult Index() { return View(new GoodStudent { Age = 13, Name = "John Smith" }); } [HttpPost] public ActionResult Index(Student student) { return View(student); } </code></pre> <p><strong>View</strong></p> <pre><code>@model AbstractTest.Models.Student @using (Html.BeginForm()) { &lt;div id="StudentEditor"&gt; &lt;p&gt;Age @Html.TextBoxFor(m =&gt; m.Age)&lt;/p&gt; &lt;p&gt;Name @Html.TextBoxFor(m =&gt; m.Name)&lt;/p&gt; &lt;p&gt;&lt;input type="button" value="Save" id="Save" /&gt;&lt;/p&gt; &lt;/div&gt; } &lt;script type="text/javascript"&gt; $('document').ready(function () { $('input#Save').click(function () { $.ajax({ url: '@Ajax.JavaScriptStringEncode(Url.Action("Index"))', type: 'POST', data: GetStudentJsonData($('div#StudentEditor')), contentType: 'application/json; charset=utf-8', success: function (data, status, jqxhr) { window.location.href = '@Url.Action("Index")'; } }); }); }); var GetStudentJsonData = function ($container) { return JSON.stringify({ 'Age': $container.find('input#Age').attr('value'), 'Name': $container.find('input#Name').attr('value') }); }; &lt;/script&gt; </code></pre> <p><strong>Added to Global.asax.cs</strong></p> <pre><code>protected void Application_Start() { ... ModelBinders.Binders.Add(new KeyValuePair&lt;Type, IModelBinder&gt;(typeof(Student), new StudentBinder())); } </code></pre>
 

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