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POASP.Net MVC Postback from View to Controller shows null values
 

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  1. POASP.Net MVC Postback from View to Controller shows null values
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    <p>I've a problem with ViewModel posting back to a controller, but the ViewModel not being mapped correctly from the View to the Controller.</p> <p><strong>TopicId</strong> and <strong>Content</strong> should contain values, however, when posted back, they do not:</p> <p><strong>VS Debug:</strong> <img src="https://i.stack.imgur.com/TZy09.png" alt="ss"></p> <p><strong>ViewModels:</strong></p> <pre><code> public class PostViewModel { public int PostId { get; set; } public string Title { get; set; } public string Description { get; set; } public string Author { get; set; } public DateTime DateOfTopic { get; set; } } public class ReplyViewModel { public int TopicId { get; set; } public string Content { get; set; } } public class PostListAndReplyVM { public List&lt;PostViewModel&gt; PostViewModel { get; set; } public ReplyViewModel ReplyViewModel { get; set; } } </code></pre> <p><strong>View:</strong></p> <pre><code>@model centreforum.Models.PostListAndReplyVM @using (Html.BeginForm()) { @Html.AntiForgeryToken() @Html.ValidationSummary(true) &lt;fieldset&gt; &lt;legend&gt;Post&lt;/legend&gt; @Html.HiddenFor(model =&gt; model.ReplyViewModel.TopicId) &lt;div class="editor-label"&gt; @Html.LabelFor(model =&gt; model.ReplyViewModel.Content) &lt;/div&gt; &lt;div class="editor-field"&gt; @Html.EditorFor(model =&gt; model.ReplyViewModel.Content) @Html.ValidationMessageFor(model =&gt; model.ReplyViewModel.Content) &lt;/div&gt; &lt;p&gt; &lt;input type="submit" value="Create" /&gt; &lt;/p&gt; &lt;/fieldset&gt; </code></pre> <p>}</p> <p><strong>Generated HTML:</strong></p> <pre><code>&lt;form action="/Post/List/7/" method="post"&gt;&lt;input name="__RequestVerificationToken" type="hidden" value="xxxxxxxxxxxxx" /&gt; &lt;fieldset&gt; &lt;legend&gt;Post&lt;/legend&gt; &lt;input data-val="true" data-val-number="The field TopicId must be a number." data-val-required="The TopicId field is required." id="ReplyViewModel_TopicId" name="ReplyViewModel.TopicId" type="hidden" value="7" /&gt; &lt;div class="editor-label"&gt; &lt;label for="ReplyViewModel_Content"&gt;Content&lt;/label&gt; &lt;/div&gt; &lt;div class="editor-field"&gt; &lt;input class="text-box single-line" id="ReplyViewModel_Content" name="ReplyViewModel.Content" type="text" value="" /&gt; &lt;span class="field-validation-valid" data-valmsg-for="ReplyViewModel.Content" data-valmsg-replace="true"&gt;&lt;/span&gt; &lt;/div&gt; &lt;p&gt; &lt;input type="submit" value="Create" /&gt; &lt;/p&gt; &lt;/fieldset&gt; &lt;/form&gt; </code></pre> <p>As you can see from the generated HTML, the TopicId definitely has a value: <code>value="7"</code></p> <p>Can anyone see where the problem is between the form post, and the controller, which is expecting the ReplyViewModel?</p> <p>Thank you,</p> <p>Mark</p>
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      1. USKamil Będkowski
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