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POPass arbitrary data from a partial view to the layout view
 

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    <p><strong>Update</strong>: It seems I was trying to set the ViewBag content in a <em>partial</em> view instead in a <em>plain</em> view, MVC3 makes it very easy to do this. I'm still interested why it doesn't work for partial views, i.e. why isn't the viewbag shared with partial views.</p> <p>I'm trying to pass some data from a partial view to the layout view by using <code>ViewData</code>/<code>ViewBag</code></p> <pre><code>// Used in the partial view public static void RequireAssets(this HtmlHelper helper, params Asset[] assets) { var alreadyRequired = helper.ViewData["RequiredAssets"] as List&lt;Asset&gt;; if (alreadyRequired == null) { alreadyRequired = new List&lt;Asset&gt;(); helper.ViewData.Add("RequiredAssets", alreadyRequired); } foreach (var asset in assets.Where(anAsset =&gt; !alreadyRequired.Contains(anAsset))) alreadyRequired.Add(asset); } // Used in the layout view public static MvcHtmlString RenderAssetStyles(this HtmlHelper helper) { var requiredAssets = helper.ViewData["RequiredAssets"] as List&lt;Asset&gt;; return requiredAssets == null ? null : GetStyleSheets(requiredAssets.Select(e =&gt; new StyleSheet(e)).ToArray()); } public static MvcHtmlString RenderAssetScripts(this HtmlHelper helper) { var requiredAssets = helper.ViewData["RequiredAssets"] as List&lt;Asset&gt;; return requiredAssets == null ? null : GetScripts(requiredAssets.Select(e =&gt; new Script(e)).ToArray()); } </code></pre> <p>The problem is that when RenderAssetStyles/Scripts is fired in the layout view the <code>ViewData</code> does not contain the key "RequiredAssets"</p> <p><strong>Usage</strong></p> <p>_Layout.cshtml:</p> <pre><code>&lt;title&gt;@ViewBag.Title&lt;/title&gt; @Html.RenderAssetStyles() </code></pre> <p>PartialView.cshtml:</p> <pre><code>@{ Html.RequireAssets(Assets.Grid, Assets.FileUpload); } </code></pre>
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