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POMVC - No Viewdata item with key of type 'IEnumerable<SelectListItem>'
 

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  1. POMVC - No Viewdata item with key of type 'IEnumerable<SelectListItem>'
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    <p>I'm new to MVC and ASP.NET and am looking to learn a bit, so I'm trying to make some trivial applications to learn the ins and outs.</p> <p>Well, I'm trying to make a dropdown box show a list of books where it would show the title of the book but post the book_id [primary key]</p> <p>The error I get is:: There is no ViewData item with the key 'book_id' of type 'IEnumerable'.</p> <p>Here is what is in my view:</p> <pre><code> &lt;p&gt; &lt;label for="book_id"&gt;Book:&lt;/label&gt; &lt;%= Html.DropDownList("book_id" , (IEnumerable&lt;SelectListItem&gt;)ViewData["Books"]) %&gt; &lt;%= Html.ValidationMessage("book_id", "*") %&gt; &lt;/p&gt; </code></pre> <p>Here is what's in my controller</p> <pre><code> // GET: /Home/Create //This is the form creation. [Authorize] public ActionResult Create() { this.ViewData["Books"] = new SelectList(_entities.BookSet.ToList(), "book_id", "Title"); return View(); } // // POST: /Home/Create //This sends it to the DB [AcceptVerbs(HttpVerbs.Post) , Authorize] public ActionResult Create([Bind(Exclude="problem_id")] Problem inProblem) { try { // TODO: Add insert logic here Models.User user = getUser(User.Identity.Name); if (user != null) { inProblem.user_id = user.user_id; } _entities.AddToProblemSet(inProblem); _entities.SaveChanges(); return RedirectToAction("Index"); } catch { return View(); } } </code></pre> <p>And my Books table looks like this</p> <pre><code> book_id title publisher language isbn </code></pre> <p>I'm assuming this is a trivial newbie mistake; but I'm not having much luck figuring it out. Any help would be great</p>
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    1. USJason Berkan
    1. USPSU_Kardi
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      1. POMVC - No Viewdata item with key of type 'IEnumerable<SelectListItem>'
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      1. VTUpMod
    1. COPlease see additional code in my response for the missing line (in the catch statement for simplicity)
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      1. POMVC - No Viewdata item with key of type 'IEnumerable<SelectListItem>'
      1. USRosstified
 

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A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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