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POMVC3 collection model binding with EditorFor
 

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    <p>Regarding this <a href="https://stackoverflow.com/a/5623498/607162">post</a> and this <a href="http://haacked.com/archive/2008/10/23/model-binding-to-a-list.aspx" rel="nofollow noreferrer">other one</a>.</p> <p>Suppose I have the following:</p> <pre><code>public class Foo { public string Value1 { get; set; } public string Value2 { get; set; } } public class BarViewModel { public string Baz { get; set; } public IList&lt;Foo&gt; Foos { get; set; } } </code></pre> <p>And I have a view that receive a <code>BarViewModel</code>:</p> <pre><code>@model BarViewModel @Html.EditorFor(model =&gt; model.Baz) &lt;table&gt; @for(int i = 0 ; i &lt; Model.Foos.Count ; i ++) { string name1 = "Foos[" + i.ToString() + "].Value1"; string name2 = "Foos[" + i.ToString() + "].Value2"; &lt;tr&gt; &lt;td&gt; &lt;input type="text" name="@name1" value="@Model.Foos[i].Value1" /&gt; &lt;/td&gt; &lt;td&gt; &lt;input type="text" name="@name2" value="@Model.Foos[i].Value2" /&gt; &lt;/td&gt; &lt;/tr&gt; } &lt;/table&gt; </code></pre> <p>And in my controller I have a POST method that recive the <code>BarViewModel</code>.</p> <p>Given the inputs names generated for Value1 and Value2 are <code>"Foos[0].Value1"</code> and <code>"Foos[1].Value1"</code> and so on, the collection on the BarViewModel, in the POST method, is automatically filled by the ModelBinder. Awesome.</p> <p>The problem is, if I do it this way in my view :</p> <pre><code> @for(int i = 0 ; i &lt; Model.Foos.Count ; i ++) { &lt;tr&gt; &lt;td&gt; @Html.EditorFor(model =&gt; model.Foos[i].Value1); &lt;/td&gt; &lt;td&gt; @Html.EditorFor(model =&gt; model.Foos[i].Value2); &lt;/td&gt; &lt;/tr&gt; } </code></pre> <p>Then the names generated for the input are like <code>"Foos__0__Value1"</code>, <em>and that break the model binding</em>. The <code>Foos</code> property of my BarViewModel, in my POST method, is now <code>null</code></p> <p>I am missing something?</p> <h2>Edit</h2> <hr> <p>If I use <code>EditorFor</code> on the collection itself:</p> <pre><code>@EditorFor(model =&gt; model.Foos) </code></pre> <p>The names are generated correctly. But that force me to build a ViewModel in /Views/Share to handle the type <code>Foos</code>, that will generate the row, wich I dont really want to do...</p> <h2>Edit 2</h2> <hr> <p>I will clarify my question here, I understand that it's a bit vague.</p> <p>If I do :</p> <pre><code>@EditorFor(model =&gt; model.Foos) </code></pre> <p>The names of the inputs will have the form <code>"Foos[0].Value1"</code> and the model binding works just fine on posts.</p> <p>But if I do :</p> <pre><code>@for(int i = 0 ; i &lt; Model.Foos.Count ; i ++) { @EditorFor(model =&gt; Model.Foos[0].Value1) } </code></pre> <p>The names takes the form <code>"Foos__0__Value1"</code> and the model binding <em>does not works</em>. On my post method, model.Foos will be null.</p> <p>Is there a reason why the second syntax breaks the model binding?</p>
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