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POHow to pass strongly typed results back to ActionResult?
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  1. POHow to pass strongly typed results back to ActionResult?
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    copied!<p>I have a view that is strongly typed:</p> <pre><code>&lt;%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage&lt;MPKwithMVC.Models.SmartFormViewModel&gt;" %&gt; </code></pre> <p>Works great to generate the view, but when I post, I have an ActionResult defined:</p> <pre><code>[AcceptVerbs(HttpVerbs.Post)] public ActionResult Next(MPKwithMVC.Models.SmartFormViewModel model) { .. } </code></pre> <p>Which I would imagine get hit when my next button is clicked (it works if I change the argument to a FormsCollection). I instead get a message saying "No parameterless constructor defined for this object".</p> <p>What am I doing wrong?</p> <p>My SmartFormsViewModel is:</p> <pre><code> [Serializable] public class SmartFormViewModel { public List&lt;Question&gt; Questions { get; set; } public List&lt;Answer&gt; Answers { get; set; } public SmartFormViewModel(List&lt;Question&gt; questions, List&lt;Answer&gt; answers) { this.Questions = questions; this.Answers = answers; } public SmartFormViewModel() { } } </code></pre> <p>And here is the View:</p> <pre><code> &lt;%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage&lt;MPKwithMVC.Models.SmartFormViewModel&gt;" %&gt; &lt;%@ Import Namespace="MPKwithMVC.Models" %&gt; &lt;asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server"&gt; SmartForms &lt;/asp:Content&gt; &lt;asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server"&gt; &lt;h2&gt; Questionaire&lt;/h2&gt; &lt;% using (Html.BeginForm("Next", "SmartForms")) { %&gt; &lt;div style="float: left; margin-right: 2em;"&gt; &lt;% Html.RenderPartial("NavigationPanel", Model); %&gt; &lt;/div&gt; &lt;div&gt; &lt;table&gt; &lt;% foreach (Question question in (Model.Questions)) { %&gt; &lt;tr&gt; &lt;td&gt; &lt;div style="text-align: right; width: 20em;"&gt; &lt;%= Html.Encode(question.QuestionText)%&gt; &lt;/div&gt; &lt;/td&gt; &lt;td&gt; &lt;div style="float: left;"&gt; &lt;% if (question.QuestionType == 1) { %&gt; &lt;%= Html.TextBoxFor(model =&gt; model.Answers[(int)question.QuestionID - 1].AnswerValue) %&gt; &lt;% } %&gt; &lt;% if (question.QuestionType == 2) { %&gt; &lt;%= Html.RadioButton("yn" + question.QuestionID, "Yes", false)%&gt;Yes &lt;%= Html.RadioButton("yn" + question.QuestionID, "No", true)%&gt;No &lt;% } %&gt; &lt;/div&gt; &lt;% if (question.Required == true) { %&gt; &lt;div style="color: Red; float: right; margin-left: 3px;"&gt; *&lt;/div&gt; &lt;% } %&gt; &lt;/td&gt; &lt;/tr&gt; &lt;% } %&gt; &lt;tr&gt; &lt;td&gt; &lt;% if (ViewData["errorMsg"] != null) {%&gt; &lt;div style="color:Red;"&gt; &lt;%= Html.Encode(ViewData["errorMsg"].ToString()) %&gt; &lt;/div&gt; &lt;% } %&gt; &lt;/td&gt; &lt;td&gt; &lt;div style="margin-top: 1em;"&gt; &lt;button name="button" value="next"&gt;Next&lt;/button&gt; &lt;/div&gt; &lt;/td&gt; &lt;/tr&gt; &lt;/table&gt; &lt;/div&gt; &lt;% } %&gt; &lt;/asp:Content&gt; </code></pre>
 

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