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POTrouble with ASP.NET MVC 3 DropDownListFor
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  1. POTrouble with ASP.NET MVC 3 DropDownListFor
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    copied!<p>I've been researching this issue, but haven't been able to piece together an answer that works in my situation. I appreciate any help.</p> <p>I'm trying to create a drop-down list that will show Application names in a Create Task page, but posts the Application ID back to the database. Currently, I'm able to get the Application names to show in the drop-down list correctly when I use DropDownList. However, the post back doesn't work, and I'd like to use DropDownListFor instead. Also, I'm using Dictionary(int, String>, but I'd prefer to use IEnumerable. I've been going around in circles trying to get the DropDownListFor to work, but no luck so far. Does anyone know what changes I need to make?</p> <p>'Task' Model:</p> <pre><code>using System; using System.Collections.Generic; using System.Web.Mvc; namespace TaskCapture.Models { public class Task { public int TaskID { get; set; } public string TaskDescription { get; set; } public int ApplicationID { get; set; } public virtual Application Application { get; set; } } } </code></pre> <p>'Application' Model:</p> <pre><code>using System; using System.Collections.Generic; namespace TaskCapture.Models { public class Application { public int ApplicationID { get; set; } public string ApplicationName { get; set; } public override string ToString() { return ApplicationName; } } } </code></pre> <p>TaskController:</p> <pre><code>using System; using System.Collections.Generic; using System.Data; using System.Data.Entity; using System.Linq; using System.Web; using System.Web.Mvc; using TaskCapture.Models; using TaskCapture.DAL; namespace TaskCapture.Controllers { public class TaskController : Controller { private SupportContext db = new SupportContext(); // // GET: /Task/Create // get application names for listing in drop down public Dictionary&lt;int, String&gt; GetApplications() { Dictionary&lt;int, String&gt; _applications = new Dictionary&lt;int, String&gt;(); var applicationsQuery = from o in db.Applications orderby o.ApplicationName select o; foreach (var c in applicationsQuery) { _applications.Add(c.ApplicationID, c.ApplicationName); } return _applications; } public ActionResult Create() { Dictionary&lt;int, String&gt; Applications = this.GetApplications(); ViewData["ApplicationList"] = new SelectList(Applications, "Key", "Value"); return View(); } // // POST: /Task/Create [HttpPost] public ActionResult Create(Task task) { try { if (ModelState.IsValid) { db.Tasks.Add(task); db.SaveChanges(); return RedirectToAction("Index"); } } catch (DataException) { //Log the error (add a variable name after DataException) ModelState.AddModelError("", "Unable to save changes. Try again...."); } return View(task); } } } </code></pre> <p>Task Create.cshmtl:</p> <pre><code>@model TaskCapture.Models.Task @{ ViewBag.Title = "Create"; } &lt;h2&gt;Create&lt;/h2&gt; &lt;script src="@Url.Content("~/Scripts/jquery.validate.min.js")" type="text/javascript"&gt;&lt;/script&gt; &lt;script src="@Url.Content("~/Scripts/jquery.validate.unobtrusive.min.js")" type="text/javascript"&gt;&lt;/script&gt; @using (Html.BeginForm()) { @Html.ValidationSummary(true) &lt;fieldset&gt; &lt;legend&gt;Task&lt;/legend&gt; &lt;div class="editor-label"&gt; @Html.LabelFor(model =&gt; model.Application.ApplicationName) &lt;/div&gt; &lt;div class="editor-field"&gt; @Html.DropDownList("ApplicationList", (SelectList) ViewData["ApplicationList"]) @Html.ValidationMessageFor(model =&gt; model.Application.ApplicationName) &lt;/div&gt; &lt;p&gt; &lt;input type="submit" value="Create" /&gt; &lt;/p&gt; &lt;/fieldset&gt; } &lt;div&gt; @Html.ActionLink("Back to List", "Index") &lt;/div&gt; </code></pre> <p>Any help is appreciated. Please let me know, if I need to post more info. Thanks.</p>
 

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