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POHow can I bind nested ViewModels from View to Controller in MVC3?
 

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  1. POHow can I bind nested ViewModels from View to Controller in MVC3?
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    <p>I am developing an ASP.NET MVC 3 application in C# and I use Razor. I am now dealing with a problem concerning the binding of objects through ViewModels passed/received to/from the View by the Controller. Let's make it clear. I have the following ViewModels:</p> <pre><code>public class ContainerViewModel { public int ContainerId {get; set;} public string ContainerName {get; set;} public List&lt;ItemPostModel&gt; ItemData {get; set;} } public class ItemPostModel { public int ItemId {get; set;} public string ItemName {get; set;} public int ItemValue {get; set;} } </code></pre> <p>The <strong>ContainerViewModel</strong> is used to pass the data to the View. Its properties <strong>ContainerId</strong> and <strong>ContainerName</strong> are used just for display purposes. The <strong><code>List&lt;ItemPostModel&gt;</code></strong> property has to be filled using a <strong>Form</strong>. The View looks something like this (it is a simplified version):</p> <pre><code>&lt;strong&gt;@Model.ContainerName&lt;/strong&gt; @using (Html.BeginForm()) { &lt;fieldset&gt; @foreach(var item in Model.ItemData) { @Html.TextBox(item.ItemId); @Html.TextBox(item.ItemName); @Html.TextBox(item.ItemValue); &lt;p&gt; &lt;input type="submit" value="Save" /&gt; &lt;/p&gt; } &lt;/fieldset&gt; } </code></pre> <p>The <strong>Controller</strong> corresponding <strong>action methods</strong> are as follows:</p> <pre><code>public ActionResult UpdateItems() { //fill in the ContainerViewModel lcontainer return View("UpdateItems", lcontainer); } [HttpPost] public ActionResult UpdateItems(int containerId, ItemPostModel itemData) { //store itemData into repository } </code></pre> <p>The problem is that with this code the <strong>ItemPostModel itemData</strong> passed to the <strong>Post ActionMethod UpdateItems</strong> is always empty. The <strong>containerId</strong> is correctly passed. Same result if I use the following code in the Controller (obviously not DRY);</p> <pre><code>[HttpPost] public ActionResult UpdateItems(ContainerViewModel container) { //extract itemData from ContainerViewModel container //store itemData into repository } </code></pre> <p>How can I <em>"teach"</em> the application that I want the form elements stored in the <strong><code>List&lt;ItemPostModel&gt;</code></strong>? Shall I modify the <strong>ModelBinder</strong> or there is a simpler way to perform this task? Thanks everybody for your answers.</p>
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