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POStrongly typed ViewModel in POST action method contains only null values
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  1. POStrongly typed ViewModel in POST action method contains only null values
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    copied!<p>I am trying to implement my Edit action methods with strongly typed view which receives a custom-shaped ViewModel class. In other words, I want a strongly typed ViewModel which contains the Linq entity that should be edited plus a few other objects that should be displayed in the View. </p> <p>I can see the view when calling the GET Edit action method, but the strongly typed POST action method receives only a ViewModel class with null parameters and I can't figure out how to retrieve the POST parameters. </p> <p>The View Model looks as follows:</p> <pre><code>//my custom-shaped ViewModel public class CustomersFormViewModel { public SelectList AccountTypesDropDownBox; public SelectList CountriesDropDownBox; public Customer Customer; } </code></pre> <p>The action method looks as follows:</p> <pre><code>// // GET: /CustomersController/Edit public ActionResult Edit(int ID) { var model = new CustomersFormViewModel { Customer = repository.Load(ID.Value), CountriesDropDownBox = GetCountries(), AccountTypesDropDownBox = GetAccountTypes() }; return View(model); } // // POST: /CustomersController/Edit [AcceptVerbs(HttpVerbs.Post)] public ActionResult Edit(CustomersFormViewModel model) { //THE NEXT LINE THROWS!!! Debug.Assert(Model.Customer!=null); return View(model); } </code></pre> <p>And this is my Edit view:</p> <pre><code>&lt;%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/CustAdminMaster.master" Inherits="System.Web.Mvc.ViewPage&lt;Zeiterfassung.Controllers.CustomersController+CustomersFormViewModel&gt;" %&gt; &lt;asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server"&gt; NewEdit &lt;/asp:Content&gt; &lt;asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server"&gt; &lt;h2&gt; NewEdit&lt;/h2&gt; &lt;%= Html.ValidationSummary("Edit was unsuccessful. Please correct the errors and try again.") %&gt; &lt;% using (Html.BeginForm()) {%&gt; &lt;fieldset&gt; &lt;legend&gt;Fields&lt;/legend&gt; &lt;p&gt; &lt;label for="FirstName"&gt;FirstName:&lt;/label&gt; &lt;%= Html.TextBox("FirstName",Model.Customer.FirstName) %&gt; &lt;%= Html.ValidationMessage("FirstName", "*") %&gt; &lt;/p&gt; &lt;p&gt; &lt;input type="submit" value="Save" /&gt; &lt;/p&gt; &lt;/fieldset&gt; &lt;% } %&gt; &lt;div&gt; &lt;%=Html.ActionLink("Back to List", "Index") %&gt; &lt;/div&gt; &lt;/asp:Content&gt; </code></pre> <p>I've also tried a POST action method with formValues parameters, but the the viewmodel still did not contain the posted parameters:</p> <pre><code>[AcceptVerbs(HttpVerbs.Post)] public ActionResult Edit(int ID, FormCollection formValues) { CustomersFormViewModel model = new CustomersFormViewModel(); UpdateModel(model); //THE NEXT LINE STILL THROWS Debug.Assert(model.Customer!=null); return View("NewEdit",model); } </code></pre> <p>The only way I have found so far is to write my own code that grab the posted parameters from the FormCollection and updates my custom ViewModel accordingly. But this approach seems a bit primitive. Is there really no better way to do this?</p> <p><strong>EDIT:</strong> I've just tried a different syntax in the view as tvanfosson suggested, but the problem remains unchanged:</p> <pre><code>&lt;label for="Customer.FirstName"&gt;FirstName:&lt;/label&gt; &lt;%= Html.TextBox("Customer.FirstName") %&gt; &lt;%= Html.ValidationMessage("Customer.FirstName", "*") %&gt; </code></pre>
 

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