StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

POMVC 3 Drop Down List Not Binding to Model
primarykey
Id
10166108
data
AcceptedAnswerId
10325588
AnswerCount
5
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2012-04-15T21:07:43.970
FavoriteCount
0
LastActivityDate
2014-02-27T23:38:26.790
LastEditDate
2012-04-15T22:15:18.353
LastEditorUserId
0
OwnerUserId
0
ParentId
0
PostTypeId
1
Score
0
ViewCount
5434
LastEditorDisplayName
user672118
text
Body
<p>In my application I have a drop down list to represent different choices. Note that <code>Paragraph</code> is a model and the section is just one field in the model.</p> <pre><code>@Html.DropDownList("Sections") </code></pre> <p>And here is my controller.</p> <pre><code>public ActionResult Edit(int id) { var paragraph = db.Paragraphs.Find(id); ViewBag.Sections = new SelectList( db.Sections.Select(s => new { s.ID, s.Name }), "ID", "Name", paragraph.SectionID ); return View(paragraph); } [HttpPost] public ActionResult Edit(Paragraph paragraph, HttpPostedFileBase document) { if (ModelState.IsValid) { // Do some stuff. } ViewBag.Sections = new SelectList( db.Sections.Select(s => new { s.ID, s.Name }), "ID", "Name", paragraph.SectionID ); return View(paragraph); } </code></pre> <p>When I submit the form though the drop down list is not bound to the model. Causing <code>ModelState.IsValid</code> to be false and making my life horrible. Any suggestions?</p> <p><strong>EDIT</strong>: When I submit the form I get the following error:</p> <pre><code>There is no ViewData item of type 'IEnumerable<SelectListItem>' that has the key 'Sections'. </code></pre> <p><strong>EDIT</strong>: It appears that I only get the preceding error when I try to submit the file.</p> <p><strong>EDIT</strong>: Model</p> <pre><code>public class Paragraph { public int ID { get; set; } [Required] public int Major { get; set; } [Required] public int Minor { get; set; } [Required(ErrorMessage = "Name is required")] [StringLength(4000)] public string Name { get; set; } public int SectionID { get; set; } public virtual Section Section { get; set; } } </code></pre> <p>Form: (It's a lot.)</p> <pre><code><form class="form-horizontal" action="/Paragraph/Edit" method="post" enctype="multipart/form-data"> <fieldset> <div class="control-group"> <label class="control-label" for="section">Section</label> <div class="controls"> @Html.DropDownList("Sections") </div> </div> <div class="control-group"> <label class="control-label" for="major">Major</label> <div class="controls"> <input type="number" class="input-large" name="major" value="@Model.Major" /> </div> </div> <div class="control-group"> <label class="control-label" for="minor">Minor</label> <div class="controls"> <input type="number" class="input-large" name="minor" value="@Model.Minor" /> </div> </div> <div class="control-group"> <label class="control-label" for="name">Name</label> <div class="controls"> <input type="text" class="input-large" name="name" value="@Model.Name" /> </div> </div> <div class="control-group"> <label class="control-label" for="document">Document</label> <div class="controls"> <input type="file" class="input-file" name="document" /> </div> </div> <div class="form-actions"> <input type="submit" class="btn btn-primary" value="Save" /> <a class="btn" href="/Paragraph/Show/@Model.ID">Cancel</a> </div> </fieldset> </form> </code></pre>
Tags
<asp.net-mvc-3><razor>
Title
MVC 3 Drop Down List Not Binding to Model
singulars
PostAcceptedAnswerId
1. PO
  singulars
  PostTypePostTypeId
  PTAnswer
PostParentId
1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. This table or related slice is empty.
UserOwnerUserId
1. This table or related slice is empty.
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. PO
  singulars
  PostTypePostTypeId
  PTAnswer
2. PO
  singulars
  PostTypePostTypeId
  PTAnswer
3. PO
  singulars
  PostTypePostTypeId
  PTAnswer
VotesPostIdCreationDate
1. This table or related slice is empty.
CommentsPostId
1. This table or related slice is empty.

Querying!

Guidance

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.