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POChild Objects Fails to Bind
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  1. POChild Objects Fails to Bind
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    copied!<p>I am currently trying to incorporate Steve Sanderson's example code into my MVC 3 application and I'm having difficulty. </p> <p><a href="http://blog.stevensanderson.com/2010/01/28/editing-a-variable-length-list-aspnet-mvc-2-style/" rel="nofollow noreferrer">http://blog.stevensanderson.com/2010/01/28/editing-a-variable-length-list-aspnet-mvc-2-style/</a> </p> <p>The problem is that when I submit the form, the order details property of the order entity remains empty. I have looked at the following answer:</p> <p><a href="https://stackoverflow.com/questions/7153405/editing-a-variable-length-list-asp-net-mvc-3-style-with-table">Editing a Variable Length List, ASP.NET MVC 3 Style with Table</a></p> <p>but I still can't get it to work. I should point out that I'm relatively new to MVC and web development in general. I've looked through the site and failed to find any answer to this, so I apologise if there is one that I've missed. I have listed the relevant code below:</p> <p>Create.cshtml</p> <pre><code>@model NorthwindLight.Models.Order @using NorthwindLight.HtmlHelpers @{ ViewBag.Title = "Create"; AjaxOptions newOpts = new AjaxOptions(); newOpts.UpdateTargetId = "tabledata"; newOpts.InsertionMode = InsertionMode.InsertAfter; } &lt;h2&gt;Create&lt;/h2&gt; &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("Create", "Order", FormMethod.Post, new { name = "mainform", id = "mainform" })) { @Html.ValidationSummary(true) &lt;fieldset&gt; &lt;legend&gt;Order&lt;/legend&gt; &lt;div class="editor-label"&gt; @Html.LabelFor(model =&gt; model.CustomerId, "Customer") &lt;/div&gt; &lt;div class="editor-field"&gt; @Html.DropDownList("CustomerId", String.Empty) @Html.ValidationMessageFor(model =&gt; model.CustomerId) &lt;/div&gt; &lt;div class="editor-label"&gt; @Html.LabelFor(model =&gt; model.OrderDate) &lt;/div&gt; &lt;div class="editor-field"&gt; @Html.EditorFor(model =&gt; model.OrderDate) @Html.ValidationMessageFor(model =&gt; model.OrderDate) &lt;/div&gt; &lt;div class="editor-label"&gt; @Html.LabelFor(model =&gt; model.ShipName) &lt;/div&gt; &lt;div class="editor-field"&gt; @Html.EditorFor(model =&gt; model.ShipName) @Html.ValidationMessageFor(model =&gt; model.ShipName) &lt;/div&gt; &lt;div class="editor-label"&gt; @Html.LabelFor(model =&gt; model.ShipAddress) &lt;/div&gt; &lt;div class="editor-field"&gt; @Html.EditorFor(model =&gt; model.ShipAddress) @Html.ValidationMessageFor(model =&gt; model.ShipAddress) &lt;/div&gt; &lt;div class="editor-label"&gt; @Html.LabelFor(model =&gt; model.ShipCity) &lt;/div&gt; &lt;div class="editor-field"&gt; @Html.EditorFor(model =&gt; model.ShipCity) @Html.ValidationMessageFor(model =&gt; model.ShipCity) &lt;/div&gt; &lt;div class="editor-label"&gt; @Html.LabelFor(model =&gt; model.ShipRegion) &lt;/div&gt; &lt;div class="editor-field"&gt; @Html.EditorFor(model =&gt; model.ShipRegion) @Html.ValidationMessageFor(model =&gt; model.ShipRegion) &lt;/div&gt; &lt;div class="editor-label"&gt; @Html.LabelFor(model =&gt; model.ShipPostalCode) &lt;/div&gt; &lt;div class="editor-field"&gt; @Html.EditorFor(model =&gt; model.ShipPostalCode) @Html.ValidationMessageFor(model =&gt; model.ShipPostalCode) &lt;/div&gt; &lt;div class="editor-label"&gt; @Html.LabelFor(model =&gt; model.ShipCountry) &lt;/div&gt; &lt;div class="editor-field"&gt; @Html.EditorFor(model =&gt; model.ShipCountry) @Html.ValidationMessageFor(model =&gt; model.ShipCountry) &lt;/div&gt; &lt;/fieldset&gt; &lt;fieldset&gt; &lt;legend&gt;Order Details&lt;/legend&gt; &lt;br /&gt; &lt;table&gt; &lt;thead&gt; &lt;tr&gt; &lt;th&gt;Order&lt;/th&gt; &lt;th&gt;Product&lt;/th&gt; &lt;th&gt;Unit Price&lt;/th&gt; &lt;th&gt;Quantity&lt;/th&gt; &lt;th&gt;&lt;/th&gt; &lt;/tr&gt; &lt;/thead&gt; &lt;tbody id="tabledata"&gt; @Html.Action("OrderDetailPartial") &lt;/tbody&gt; &lt;/table&gt; @Ajax.ActionLink("New Record", "OrderDetailPartial", newOpts) &lt;/fieldset&gt; } &lt;div&gt; &lt;a href="javascript:document.mainform.submit();"&gt;Create&lt;/a&gt; @Html.ActionLink("Back to List", "Index") &lt;/div&gt; </code></pre> <p>OrderDetailPartial.cshtml</p> <pre><code>@model NorthwindLight.Models.OrderDetail @using NorthwindLight.Models @using NorthwindLight.HtmlHelpers @{ Layout = null; var context = new NorthwindContext(); } &lt;tr&gt; &lt;td&gt; @using (Html.BeginCollectionItem("items")) { @:&lt;/td&gt; @:&lt;td&gt; @Html.Hidden("OrderId") @:&lt;/td&gt; @:&lt;td&gt; @Html.DropDownListFor(m =&gt; Model.ProductId, new SelectList (context.Products, "ProductId", "ProductName"), string.Empty) @:&lt;/td&gt; @:&lt;td&gt; @Html.EditorFor(m =&gt; Model.UnitPrice) @:&lt;/td&gt; @:&lt;td&gt; @Html.EditorFor(m =&gt; Model.Quantity) @:&lt;/td&gt; @:&lt;td&gt; &lt;a href="#" class="deleteRow"&gt;Delete&lt;/a&gt; } &lt;/td&gt; &lt;/tr&gt; </code></pre> <p>Action methods of OrderController</p> <pre><code>public ActionResult Create() { ViewBag.CustomerId = new SelectList(db.Customers, "CustomerId", "CompanyName"); return View(); } [HttpPost] public ActionResult Create(Order order) { if (ModelState.IsValid) { db.Orders.Add(order); db.SaveChanges(); return RedirectToAction("Index"); } ViewBag.CustomerId = new SelectList(db.Customers, "CustomerId", "CompanyName", order.CustomerId); return View(order); } public ViewResult OrderDetailPartial() { OrderDetail orderDetail = new OrderDetail(); return View(orderDetail); } </code></pre> <p>Order.cs</p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Web; namespace NorthwindLight.Models { public class Order { public int OrderId { get; set; } public int CustomerId { get; set; } public DateTime OrderDate { get; set; } public string ShipName { get; set; } public string ShipAddress { get; set; } public string ShipCity { get; set; } public string ShipRegion { get; set; } public string ShipPostalCode { get; set; } public string ShipCountry { get; set; } public virtual Customer Customer { get; set; } public byte[] RowVersion { get; set; } public virtual List&lt;OrderDetail&gt; OrderDetails { get; set; } public Order() { OrderDetails = new List&lt;OrderDetail&gt;(); } } } </code></pre> <p>OrderDetail.cs</p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.ComponentModel.DataAnnotations; namespace NorthwindLight.Models { public class OrderDetail { public int OrderId { get; set; } public int ProductId { get; set; } public decimal UnitPrice { get; set; } public int Quantity { get; set; } public virtual Order Order { get; set; } public virtual Product Product { get; set; } } } </code></pre> <p>The previous mentioned user stated that he got his example to work without having to change anything in the Html.BeginCollectionItem code that Steve Sanderson supplied, but I include that also (I should point out that this code item is totally beyond me at this time. I was hoping to use it as a black box).</p> <pre><code>using System; using System.Web.Mvc; using System.Web; using System.Collections.Generic; namespace NorthwindLight.HtmlHelpers { public static class HtmlPrefixScopeExtensions { private const string idsToReuseKey = "__htmlPrefixScopeExtensions_IdsToReuse_"; public static IDisposable BeginCollectionItem(this HtmlHelper html, string collectionName) { var idsToReuse = GetIdsToReuse(html.ViewContext.HttpContext, collectionName); string itemIndex = idsToReuse.Count &gt; 0 ? idsToReuse.Dequeue() : Guid.NewGuid().ToString(); // autocomplete="off" is needed to work around a very annoying Chrome behaviour whereby it reuses old values after the user clicks "Back", which causes the xyz.index and xyz[...] values to get out of sync. html.ViewContext.Writer.WriteLine(string.Format("&lt;input type=\"hidden\" name=\"{0}.index\" autocomplete=\"off\" value=\"{1}\" /&gt;", collectionName, html.Encode(itemIndex))); return BeginHtmlFieldPrefixScope(html, string.Format("{0}[{1}]", collectionName, itemIndex)); } public static IDisposable BeginHtmlFieldPrefixScope(this HtmlHelper html, string htmlFieldPrefix) { return new HtmlFieldPrefixScope(html.ViewData.TemplateInfo, htmlFieldPrefix); } private static Queue&lt;string&gt; GetIdsToReuse(HttpContextBase httpContext, string collectionName) { // We need to use the same sequence of IDs following a server-side validation failure, // otherwise the framework won't render the validation error messages next to each item. string key = idsToReuseKey + collectionName; var queue = (Queue&lt;string&gt;)httpContext.Items[key]; if (queue == null) { httpContext.Items[key] = queue = new Queue&lt;string&gt;(); var previouslyUsedIds = httpContext.Request[collectionName + ".index"]; if (!string.IsNullOrEmpty(previouslyUsedIds)) foreach (string previouslyUsedId in previouslyUsedIds.Split(',')) queue.Enqueue(previouslyUsedId); } return queue; } private class HtmlFieldPrefixScope : IDisposable { private readonly TemplateInfo templateInfo; private readonly string previousHtmlFieldPrefix; public HtmlFieldPrefixScope(TemplateInfo templateInfo, string htmlFieldPrefix) { this.templateInfo = templateInfo; previousHtmlFieldPrefix = templateInfo.HtmlFieldPrefix; templateInfo.HtmlFieldPrefix = htmlFieldPrefix; } public void Dispose() { templateInfo.HtmlFieldPrefix = previousHtmlFieldPrefix; } } } } </code></pre> <p>I have also included below a sample of the html that is created from the above code.</p> <pre><code>&lt;html class=" js flexbox canvas canvastext webgl no-touch geolocation postmessage no-websqldatabase indexeddb hashchange history draganddrop websockets rgba hsla multiplebgs backgroundsize borderimage borderradius boxshadow textshadow opacity cssanimations csscolumns cssgradients no-cssreflections csstransforms csstransforms3d csstransitions fontface video audio localstorage sessionstorage webworkers applicationcache svg inlinesvg smil svgclippaths"&gt;&lt;head&gt; &lt;meta charset="utf-8"&gt; &lt;title&gt;Create&lt;/title&gt; &lt;link type="text/css" rel="stylesheet" href="/Content/Site.css"&gt; &lt;script type="text/javascript" src="/Scripts/jquery-1.5.1.min.js"&gt;&lt;/script&gt; &lt;script type="text/javascript" src="/Scripts/modernizr-1.7.min.js"&gt;&lt;/script&gt; &lt;script type="text/javascript" src="/Scripts/DeleteRow.js"&gt;&lt;/script&gt; &lt;script type="text/javascript" src="/Scripts/jquery.unobtrusive-ajax.js"&gt;&lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;div class="page"&gt; &lt;header&gt; &lt;div id="title"&gt; &lt;h1&gt;My MVC Application&lt;/h1&gt; &lt;/div&gt; &lt;div id="logindisplay"&gt; [ &lt;a href="/Account/LogOn"&gt;Log On&lt;/a&gt; ] &lt;/div&gt; &lt;nav&gt; &lt;ul id="menu"&gt; &lt;li&gt;&lt;a href="/"&gt;Home&lt;/a&gt;&lt;/li&gt; &lt;li&gt;&lt;a href="/Home/About"&gt;About&lt;/a&gt;&lt;/li&gt; &lt;/ul&gt; &lt;/nav&gt; &lt;/header&gt; &lt;section id="main"&gt; &lt;h2&gt;Create&lt;/h2&gt; &lt;script type="text/javascript" src="/Scripts/jquery.validate.min.js"&gt;&lt;/script&gt; &lt;script type="text/javascript" src="/Scripts/jquery.validate.unobtrusive.min.js"&gt;&lt;/script&gt; &lt;form name="mainform" method="post" id="mainform" action="/Order/Create"&gt; &lt;fieldset&gt; &lt;legend&gt;Order&lt;/legend&gt; &lt;div class="editor-label"&gt; &lt;label for="CustomerId"&gt;Customer&lt;/label&gt; &lt;/div&gt; &lt;div class="editor-field"&gt; &lt;select name="CustomerId" id="CustomerId" class="valid"&gt;&lt;option value=""&gt;&lt;/option&gt; &lt;option value="1"&gt;One Company&lt;/option&gt; &lt;option value="2"&gt;Two Company&lt;/option&gt; &lt;option value="3"&gt;Three Company&lt;/option&gt; &lt;/select&gt; &lt;span data-valmsg-replace="true" data-valmsg-for="CustomerId" class="field-validation-valid"&gt;&lt;/span&gt; &lt;/div&gt; &lt;div class="editor-label"&gt; &lt;label for="OrderDate"&gt;OrderDate&lt;/label&gt; &lt;/div&gt; &lt;div class="editor-field"&gt; &lt;input type="text" value="" name="OrderDate" id="OrderDate" data-val-required="The OrderDate field is required." data-val="true" class="text-box single-line valid"&gt; &lt;span data-valmsg-replace="true" data-valmsg-for="OrderDate" class="field-validation-valid"&gt;&lt;/span&gt; &lt;/div&gt; &lt;div class="editor-label"&gt; &lt;label for="ShipName"&gt;ShipName&lt;/label&gt; &lt;/div&gt; &lt;div class="editor-field"&gt; &lt;input type="text" value="" name="ShipName" id="ShipName" class="text-box single-line valid"&gt; &lt;span data-valmsg-replace="true" data-valmsg-for="ShipName" class="field-validation-valid"&gt;&lt;/span&gt; &lt;/div&gt; &lt;div class="editor-label"&gt; &lt;label for="ShipAddress"&gt;ShipAddress&lt;/label&gt; &lt;/div&gt; &lt;div class="editor-field"&gt; &lt;input type="text" value="" name="ShipAddress" id="ShipAddress" class="text-box single-line valid"&gt; &lt;span data-valmsg-replace="true" data-valmsg-for="ShipAddress" class="field-validation-valid"&gt;&lt;/span&gt; &lt;/div&gt; &lt;div class="editor-label"&gt; &lt;label for="ShipCity"&gt;ShipCity&lt;/label&gt; &lt;/div&gt; &lt;div class="editor-field"&gt; &lt;input type="text" value="" name="ShipCity" id="ShipCity" class="text-box single-line valid"&gt; &lt;span data-valmsg-replace="true" data-valmsg-for="ShipCity" class="field-validation-valid"&gt;&lt;/span&gt; &lt;/div&gt; &lt;div class="editor-label"&gt; &lt;label for="ShipRegion"&gt;ShipRegion&lt;/label&gt; &lt;/div&gt; &lt;div class="editor-field"&gt; &lt;input type="text" value="" name="ShipRegion" id="ShipRegion" class="text-box single-line valid"&gt; &lt;span data-valmsg-replace="true" data-valmsg-for="ShipRegion" class="field-validation-valid"&gt;&lt;/span&gt; &lt;/div&gt; &lt;div class="editor-label"&gt; &lt;label for="ShipPostalCode"&gt;ShipPostalCode&lt;/label&gt; &lt;/div&gt; &lt;div class="editor-field"&gt; &lt;input type="text" value="" name="ShipPostalCode" id="ShipPostalCode" class="text-box single-line valid"&gt; &lt;span data-valmsg-replace="true" data-valmsg-for="ShipPostalCode" class="field-validation-valid"&gt;&lt;/span&gt; &lt;/div&gt; &lt;div class="editor-label"&gt; &lt;label for="ShipCountry"&gt;ShipCountry&lt;/label&gt; &lt;/div&gt; &lt;div class="editor-field"&gt; &lt;input type="text" value="" name="ShipCountry" id="ShipCountry" class="text-box single-line valid"&gt; &lt;span data-valmsg-replace="true" data-valmsg-for="ShipCountry" class="field-validation-valid"&gt;&lt;/span&gt; &lt;/div&gt; &lt;/fieldset&gt; &lt;fieldset&gt; &lt;legend&gt;Order Details&lt;/legend&gt; &lt;br&gt; &lt;table&gt; &lt;thead&gt; &lt;tr&gt; &lt;th&gt;Product&lt;/th&gt; &lt;th&gt;Unit Price&lt;/th&gt; &lt;th&gt;Quantity&lt;/th&gt; &lt;th&gt;&lt;/th&gt; &lt;/tr&gt; &lt;/thead&gt; &lt;tbody id="tabledata"&gt; &lt;tr&gt; &lt;td&gt; &lt;input type="hidden" value="96300b05-ec2e-4058-b380-b67976c6ae41" autocomplete="off" name="items.index"&gt; &lt;select name="items[96300b05-ec2e-4058-b380-b67976c6ae41].ProductId" id="items_96300b05-ec2e-4058-b380-b67976c6ae41__ProductId" data-val-required="The ProductId field is required." data-val-number="The field ProductId must be a number." data-val="true" class="valid"&gt;&lt;option value=""&gt;&lt;/option&gt; &lt;option value="1"&gt;One Product&lt;/option&gt; &lt;option value="2"&gt;Two Product&lt;/option&gt; &lt;option value="3"&gt;Three Product&lt;/option&gt; &lt;option value="4"&gt;Four Product&lt;/option&gt; &lt;/select&gt; &lt;/td&gt; &lt;td&gt; &lt;input type="text" value="0.00" name="items[96300b05-ec2e-4058-b380-b67976c6ae41].UnitPrice" id="items_96300b05-ec2e-4058-b380-b67976c6ae41__UnitPrice" data-val-required="The UnitPrice field is required." data-val-number="The field UnitPrice must be a number." data-val="true" class="text-box single-line valid"&gt; &lt;/td&gt; &lt;td&gt; &lt;input type="text" value="0" name="items[96300b05-ec2e-4058-b380-b67976c6ae41].Quantity" id="items_96300b05-ec2e-4058-b380-b67976c6ae41__Quantity" data-val-required="The Quantity field is required." data-val-number="The field Quantity must be a number." data-val="true" class="text-box single-line valid"&gt; &lt;/td&gt; &lt;td&gt; &lt;a class="deleteRow" href="#"&gt;Delete&lt;/a&gt; &lt;/td&gt; &lt;td&gt;&lt;input type="hidden" value="" name="items[96300b05-ec2e-4058-b380-b67976c6ae41].OrderId" id="items_96300b05-ec2e-4058-b380-b67976c6ae41__OrderId" data-val-required="The OrderId field is required." data-val-number="The field OrderId must be a number." data-val="true"&gt; &lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt; &lt;input type="hidden" value="a7286ad0-8389-4613-aefe-120a54f57318" autocomplete="off" name="items.index"&gt; &lt;select name="items[a7286ad0-8389-4613-aefe-120a54f57318].ProductId" id="items_a7286ad0-8389-4613-aefe-120a54f57318__ProductId" class="valid"&gt;&lt;option value=""&gt;&lt;/option&gt; &lt;option value="1"&gt;One Product&lt;/option&gt; &lt;option value="2"&gt;Two Product&lt;/option&gt; &lt;option value="3"&gt;Three Product&lt;/option&gt; &lt;option value="4"&gt;Four Product&lt;/option&gt; &lt;/select&gt; &lt;/td&gt; &lt;td&gt; &lt;input type="text" value="0.00" name="items[a7286ad0-8389-4613-aefe-120a54f57318].UnitPrice" id="items_a7286ad0-8389-4613-aefe-120a54f57318__UnitPrice" class="text-box single-line valid"&gt; &lt;/td&gt; &lt;td&gt; &lt;input type="text" value="0" name="items[a7286ad0-8389-4613-aefe-120a54f57318].Quantity" id="items_a7286ad0-8389-4613-aefe-120a54f57318__Quantity" class="text-box single-line valid"&gt; &lt;/td&gt; &lt;td&gt; &lt;a class="deleteRow" href="#"&gt;Delete&lt;/a&gt; &lt;/td&gt; &lt;td&gt;&lt;input type="hidden" value="" name="items[a7286ad0-8389-4613-aefe-120a54f57318].OrderId" id="items_a7286ad0-8389-4613-aefe-120a54f57318__OrderId"&gt; &lt;/td&gt; &lt;/tr&gt;&lt;/tbody&gt; &lt;/table&gt; &lt;a href="/Order/OrderDetailPartial" data-ajax-update="#tabledata" data-ajax-mode="after" data-ajax="true"&gt;New Record&lt;/a&gt; &lt;/fieldset&gt; &lt;/form&gt; &lt;div&gt; &lt;a href="javascript:document.mainform.submit();"&gt;Create&lt;/a&gt; &lt;a href="/Order"&gt;Cancel&lt;/a&gt; &lt;/div&gt; &lt;/section&gt; &lt;footer&gt; &lt;/footer&gt; &lt;/div&gt; &lt;/body&gt;&lt;/html&gt; </code></pre> <p>What happens is that when I press submit, the Order entity has its properties caught by the model binder, but the List has a count of 0.</p> <p>Any help would be greatly appreciated.</p> <p>Edit: Is there anything wrong with the way that I've asked this question. It's not that I'm impatient, but I thought that I would have had a comment by now. If anyone has any way of this question being improved, please let me know.</p> <p>Edit: After waiting a week and getting no responses, I've been trying to get around using the defaultbinder by changing the create method to the following: </p> <pre><code>[HttpPost] public ActionResult Create(FormCollection formCollection) { Order order = new Order(); UpdateModel(order); order.OrderDetails = new List&lt;OrderDetail&gt;(); UpdateModel(order.OrderDetails); if (ModelState.IsValid) { db.Orders.Add(order); db.SaveChanges(); return RedirectToAction("Index"); } ViewBag.CustomerId = new SelectList(db.Customers, "CustomerId", "CompanyName", order.CustomerId); return View(order); } </code></pre> <p>This has worked to a certain extent, in that I now get the following keys in the FormCollection object: </p> <pre><code>[0] = "CustomerId" [1] = "OrderDate" [2] = "ShipName" [3] = "ShipAddress" [4] = "ShipCity" [5] = "ShipRegion" [6] = "ShipPostalCode" [7] = "ShipCountry" [8] = "items.index" [9] = "items[c2e8e9de-f81a-4b9b-9763-55dda8acd892].ProductId" [10] = "items[c2e8e9de-f81a-4b9b-9763-55dda8acd892].UnitPrice" [11] = "items[c2e8e9de-f81a-4b9b-9763-55dda8acd892].Quantity" [12] = "items[c2e8e9de-f81a-4b9b-9763-55dda8acd892].OrderId" [13] = "items[dafbddb2-efb0-42b8-ac03-177e29e70f2b].ProductId" [14] = "items[dafbddb2-efb0-42b8-ac03-177e29e70f2b].UnitPrice" [15] = "items[dafbddb2-efb0-42b8-ac03-177e29e70f2b].Quantity" [16] = "items[dafbddb2-efb0-42b8-ac03-177e29e70f2b].OrderId" </code></pre> <p>I got the idea from this site <a href="http://goneale.com/2009/07/27/updating-multiple-child-objects-and-or-collections-in-asp-net-mvc-views/" rel="nofollow noreferrer">http://goneale.com/2009/07/27/updating-multiple-child-objects-and-or-collections-in-asp-net-mvc-views/</a> but I still do not know how to get the child values into the OrderDetails property of the order object. </p> <p>Again, any comments would be greatly appreciated, as I'm not even sure that I'm asking this question in the right way.</p> <p>Edit: I have received an answer from another forum, so I thought that I'd add it to this post. My error was that I'd entered "items" to BeginCollectionItem, when I should have entered "OrderDetails". The code for the partial view is now as follows:</p> <pre><code> @model NorthwindLight.Models.OrderDetail @using NorthwindLight.Models @using NorthwindLight.HtmlHelpers @{ Layout = null; var context = new NorthwindContext(); } &lt;tr&gt; @using (Html.BeginCollectionItem("OrderDetails")) { @:&lt;td&gt; @Html.DropDownListFor(m =&gt; Model.ProductId, new SelectList(context.Products, "ProductId", "ProductName"), string.Empty) @:&lt;/td&gt; @:&lt;td&gt; @Html.EditorFor(m =&gt; Model.UnitPrice) @:&lt;/td&gt; @:&lt;td&gt; @Html.EditorFor(m =&gt; Model.Quantity) @:&lt;/td&gt; @:&lt;td&gt; &lt;a href="#" class="deleteRow"&gt;Delete&lt;/a&gt; @:&lt;/td&gt; @:&lt;td&gt;@Html.HiddenFor(m =&gt; m.OrderId); } &lt;/td&gt; &lt;/tr&gt; </code></pre> <p>It's obvious now that I've seen it, but I couldn't see the wood for the trees. Many thanks to all those that looked at the code.</p>
 

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