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POASP.NET MVC 3 Model-binding and form fields
 

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    <p>I have an entity called <code>Domain.Models.BlogPost</code> which contains the following properties:</p> <ul> <li>PostID</li> <li>Title</li> <li>Author</li> <li>PostedDate</li> <li>Body</li> </ul> <p>I also have an entity called <code>Domain.Models.PostComment</code> which contains the following properties:</p> <ul> <li>CommentID</li> <li>PostID</li> <li>Author</li> <li>Email</li> <li>Website</li> <li>Body</li> </ul> <p><code>BlogPost</code> contains many <code>PostComments</code>. A one to many relationship.</p> <p>Now I have a view like this (separated comment form from blog post code via html comment):</p> <pre><code>@model Domain.Models.BlogPost @using Domain.Models; @{ ViewBag.Title = "Post"; } &lt;div class="postTitle"&gt;@Model.Title&lt;/div&gt; &lt;div class="subInfo"&gt; Posted by @Model.Author on @Model.PostedDate.ToString("D") &lt;/div&gt; &lt;div class="postBody"&gt; @Html.Markdown(Model.Body) &lt;/div&gt; &lt;br /&gt; @Model.PostComments.Count Comment(s). &lt;div class="comments"&gt; @foreach (PostComment postComment in Model.PostComments) { Html.RenderPartial("PostComment", postComment); } &lt;/div&gt; &lt;!-- BELOW IS THE ADD COMMENT FORM --&gt; &lt;div id="addComment"&gt; @using (Html.BeginForm("AddComment", "Blog")) { &lt;text&gt; @Html.Hidden("PostID", Model.PostID)&lt;br /&gt; Name: @Html.TextBox("Author")&lt;br /&gt; Email: @Html.TextBox("Email")&lt;br /&gt; Website: @Html.TextBox("Website")&lt;br /&gt; Body: @Html.TextArea("Body")&lt;br /&gt; &lt;input type="submit" value = "Add Comment" /&gt; &lt;/text&gt; } &lt;/div&gt; @Html.ActionLink("Add Comment", "AddComment") </code></pre> <p>The problem is that because the comment form uses <code>@Html.TextBox("Author")</code> and <code>@Html.TextBox("Body")</code>, they are populated with data from the model, which also contains properties <code>Author</code> and <code>Body</code>. Any suggestions on how to fix this so these fields don't get values put in them when the page loads?</p> <p>I also tried creating a <code>BlogPostViewModel</code> and setting that as the model of the view and assigning the <code>BlogPost</code> property with my actual model:</p> <pre><code>public class BlogPostViewModel { public BlogPost BlogPost { get; set; } public PostComment NewComment { get; set; } } </code></pre> <p>Then I did <code>@Html.TextBoxFor(x =&gt; x.NewComment.Author)</code> but when the form posted to this action method:</p> <pre><code>public ActionResult AddComment(PostComment postComment) { // ... } </code></pre> <p><code>postComment</code> did not bind to the form values :/</p>
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    1. COThis is an ugly fact of the default model binder. I've hit this a few times. My best solution has been to add [Bind(Exclude="Author, Body")] to the action and then fix up the snafu manually. I'd love to hear a better approach.
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    2. COI would love to hear a better approach also.
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    3. COSaw your update, try binding based on the NewComment prefix. i.e. put [Bind(Prefix = "NewComment")] before the parameter PostComment postComment
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