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POASP.NET MVC3: View POSTed model value is NULL
 

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  1. POASP.NET MVC3: View POSTed model value is NULL
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    <p>I have the following controller and view. It is listing the values correctly using GET. When I click on the button it causes a POST. However the value received in the controller is NULL. How do we correct it?</p> <p>HIGHLIGHTED CODE</p> <pre><code> [HttpPost] public ActionResult CastVote(IEnumerable&lt;Program&gt; theProgramList) </code></pre> <p>GET Image</p> <p><img src="https://i.stack.imgur.com/n9z6p.jpg" alt="enter image description here"></p> <p>CODE</p> <pre><code> public enum RatingEnum { Poor = 0, Neutral, Good, Excellent }; public class Program { public int ProgramID { get; set; } public string ProgramName { get; set; } public RatingEnum RatingID { get; set; } public string ProgramCategory { get; set; } } </code></pre> <p>CONTROLLER</p> <pre><code>namespace MyProgramRatingApp.Controllers { public class ProgramController : Controller { List&lt;Program&gt; programList = new List&lt;Program&gt;() { new Program { ProgramID = 1,ProgramName = "Program1", ProgramCategory = "A" }, new Program { ProgramID = 2,ProgramName = "Program2", ProgramCategory = "B" }, new Program { ProgramID = 3,ProgramName = "Program3", ProgramCategory = "A" } }; // GET: /Program/ public ActionResult CastVote() { ViewBag.RatingEnum = GetRstingSelectList(); return View(programList); } // POST: /StoreManager/Create [HttpPost] public ActionResult CastVote(IEnumerable&lt;Program&gt; theProgramList) { if (ModelState.IsValid) { //Save the book in DB first and then redirectToAction. return RedirectToAction("CastVote"); } return View(theProgramList); } public static SelectList GetRstingSelectList() { Array values = Enum.GetValues(typeof(RatingEnum)); List&lt;System.Web.UI.WebControls.ListItem&gt; items = new List&lt;System.Web.UI.WebControls.ListItem&gt;(values.Length); foreach (var i in values) { items.Add(new System.Web.UI.WebControls.ListItem { Text = Enum.GetName(typeof(RatingEnum), i), Value = ((int)i).ToString() } ); } return new SelectList(items); } } } </code></pre> <p>VIEW</p> <pre><code>@model IEnumerable&lt;MyProgramRatingApp.Program&gt; @{ ViewBag.Title = "CastVote"; } &lt;h2&gt;CastVote&lt;/h2&gt; @using (Html.BeginForm()) { &lt;table&gt; &lt;tr&gt; &lt;th style="border:1px solid Teal; background-color:Gray"&gt; ProgramName &lt;/th&gt; &lt;th style="border:1px solid Teal; background-color:Gray"&gt; RatingID &lt;/th&gt; &lt;th style="border:1px solid Teal; background-color:Gray"&gt; ProgramCategory &lt;/th&gt; &lt;th style="border:1px solid Teal; background-color:Gray"&gt;&lt;/th&gt; &lt;/tr&gt; @foreach (var item in Model) { &lt;tr&gt; &lt;td style="border:1px solid Teal"&gt; @Html.DisplayFor(modelItem =&gt; item.ProgramName) &lt;/td&gt; &lt;td style="border:1px solid Teal"&gt; @Html.DisplayFor(modelItem =&gt; item.RatingID) &lt;/td&gt; &lt;td style="border:1px solid Teal"&gt; @Html.DisplayFor(modelItem =&gt; item.ProgramCategory) &lt;/td&gt; &lt;td style="border:1px solid Teal"&gt; @Html.DropDownListFor(model =&gt; item.RatingID, (SelectList)ViewBag.RatingEnum, String.Empty) &lt;/td&gt; &lt;/tr&gt; } &lt;/table&gt; &lt;p&gt; &lt;input type="submit" value="Cast Vote" /&gt; &lt;/p&gt; } </code></pre> <p>READING:</p> <ol> <li><p><a href="https://stackoverflow.com/questions/6807256/dropdownlist-set-selected-value-in-mvc3-razor">dropdownlist set selected value in MVC3 Razor</a></p></li> <li><p><a href="https://stackoverflow.com/questions/5037580/asp-net-mvc-3-partial-vs-display-template-vs-editor-template">ASP.NET MVC 3 - Partial vs Display Template vs Editor Template</a></p></li> <li><p><a href="https://stackoverflow.com/questions/9005785/ienumerable-property-with-mvc3-editortemplate">IEnumerable property with MVC3 EditorTemplate</a></p></li> <li><p>ASP.NET Wire Format for Model Binding to Arrays, Lists, Collections, Dictionaries</p></li> <li><p>Model Binding To A List</p></li> </ol> <hr>
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    1. CODisplayFor is probably generating ProgramName (in the name attr) for the complete list which cannot be bound back to the model. check the names in the html I think they need to be ProgramName[0], ProgramName[1] etc..
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    2. COSince I am a newbie in MVC, I didn't quite understand your point. Could you please provide a code demo? Also, I the number of programs is dynamic (from database) in real scenario.
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    3. COto check what values are actually being posted accept a FormCollection parameter in your post action.
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      1. USnathan gonzalez
 

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