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POASP.NET MVC Model Binder returns null object
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  1. POASP.NET MVC Model Binder returns null object
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    copied!<p>I am having a problem where everytime I post a form back to the <code>[HttpPost]</code> version of my controller action, the ModelBinder returns a null object. I can't work out why. If I change the signature to use a <code>FormCollection</code> instead I can see that all the correct keys have been set. Can someone help me pin point what's wrong here, because I can't spot it.</p> <p>Here are the models for working with my views</p> <pre><code>public class DeviceModel { public int Id { get; set; } [Required] [Display(Name = "Manufacturer")] public int ManufacturerId { get; set; } [Required] [Display(Name = "Model")] [StringLength(20)] public string Model { get; set; } [StringLength(50)] [Display(Name = "Name")] public string Name { get; set; } [StringLength(50)] [Display(Name = "CodeName")] public string CodeName { get; set; } public int? ImageId { get; set; } } public class DeviceCreateViewModel : DeviceModel { public IEnumerable&lt;SelectListItem&gt; Manufacturers { get; set; } } </code></pre> <p>Which I use in my controller like so:</p> <pre><code>public ActionResult Create() { DeviceCreateViewModel viewModel = new DeviceCreateViewModel() { Manufacturers = ManufacturerHelper.GetSortedManufacturersDropDownList() }; return View(viewModel); } [HttpPost] public ActionResult Create(DeviceModel model) { // if I check model here it is NULL return View(); } </code></pre> <p>And the view looks like this:</p> <pre><code>@model TMDM.Models.DeviceCreateViewModel &lt;script src="@Url.Content("~/Scripts/jquery.validate.min.js")" type="text/javascript"&gt;&lt;/script&gt; &lt;script src="@Url.Content("~/Scripts/jquery.validate.unobtrusive.min.js")" type="text/javascript"&gt;&lt;/script&gt; @using (Html.BeginForm()) { @Html.ValidationSummary(true) &lt;fieldset&gt; &lt;div class="editor-label"&gt; @Html.LabelFor(model =&gt; model.ManufacturerId) &lt;/div&gt; &lt;div class="editor-field"&gt; @Html.DropDownList("ManufacturerId", Model.Manufacturers) @Html.ValidationMessageFor(model =&gt; model.ManufacturerId) &lt;/div&gt; &lt;div class="editor-label"&gt; @Html.LabelFor(model =&gt; model.Model) &lt;/div&gt; &lt;div class="editor-field"&gt; @Html.EditorFor(model =&gt; model.Model) @Html.ValidationMessageFor(model =&gt; model.Model) &lt;/div&gt; &lt;div class="editor-label"&gt; @Html.LabelFor(model =&gt; model.Name) &lt;/div&gt; &lt;div class="editor-field"&gt; @Html.EditorFor(model =&gt; model.Name) @Html.ValidationMessageFor(model =&gt; model.Name) &lt;/div&gt; &lt;div class="editor-label"&gt; @Html.LabelFor(model =&gt; model.CodeName) &lt;/div&gt; &lt;div class="editor-field"&gt; @Html.EditorFor(model =&gt; model.CodeName) @Html.ValidationMessageFor(model =&gt; model.CodeName) &lt;/div&gt; &lt;p&gt; &lt;input type="submit" value="Save" class="medium green awesome" /&gt; @Html.ActionLink("Cancel", "Index", "Device", null, new { @class="medium black awesome" }) &lt;/p&gt; &lt;/fieldset&gt; } </code></pre>
 

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