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POHow to pass nullable properties from ASP.NET view to Controller?
 

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  1. POHow to pass nullable properties from ASP.NET view to Controller?
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    <p>I've been reading stackoverflow for a few years now, but this is the first time I really need to post a question as I can't seem to find a suitable answer anywhere.</p> <p>The thing is, I want to pass an object (a LinqToSQL entity to be precise) to my View, allow the user to add some properties, and then post it back to save it.</p> <p>My object, called Probation, has a few properties (id, forpost, forcomment, user, starting, hours) and some related entity references. The forpost and forcomment entities are nullable as a user can be probated for making an offensive post or an offensive comment. Please mind that forpost refers to an Idea entity, I don't know what I was thinking calling it a post.</p> <p>So here's my controller logic:</p> <pre><code> [Authorize(Roles = "Admin, Moderator")] public ActionResult ProbateUser(int? post, int? comment) { if (post != null) { Idea idea = irep.GetIdea(post ?? 0); Probation probation = new Probation { user = (Guid)idea.user, Idea = idea }; return View(probation); } if (comment != null) { Comment rcomment = crep.GetComment(comment ?? 0); Probation probation = new Probation { user = rcomment.user, Comment = rcomment }; return View(probation); } return View("NotFound"); } [AcceptVerbs(HttpVerbs.Post)] [Authorize] public ActionResult ProbateUser(Probation probation, FormCollection values) { try { probation.starting = DateTime.Now; rep.ProbateUser(probation); rep.Save(); return RedirectToAction("Index"); } catch { return View("NotFound"); } } } </code></pre> <p>And here's the view, using hidden fields to store the preset values:</p> <pre><code> &lt;fieldset&gt; &lt;legend&gt;Fields&lt;/legend&gt; &lt;%: Html.Hidden("Idea", Model.Idea)%&gt; &lt;%: Html.Hidden("Comment", Model.Comment)%&gt; &lt;%: Html.Hidden("user", Model.user) %&gt; &lt;div class="editor-label"&gt; &lt;%: Html.LabelFor(model =&gt; model.reason) %&gt; &lt;/div&gt; &lt;div class="editor-field"&gt; &lt;%: Html.TextAreaFor(model =&gt; model.reason) %&gt; &lt;%: Html.ValidationMessageFor(model =&gt; model.reason) %&gt; &lt;/div&gt; &lt;div class="editor-label"&gt; &lt;%: Html.LabelFor(model =&gt; model.hours) %&gt; &lt;/div&gt; &lt;div class="editor-field"&gt; &lt;%: Html.TextBoxFor(model =&gt; model.hours) %&gt; &lt;%: Html.ValidationMessageFor(model =&gt; model.hours) %&gt; &lt;/div&gt; &lt;p&gt; &lt;input type="submit" value="Create" /&gt; &lt;/p&gt; &lt;/fieldset&gt; </code></pre> <p>Now my problem is, once the Probation object is posted back, the nullable fields forcomment and forpost are always null! </p> <p>So to summarize: what is the correct way of passing objects with nullable properties from Controller->View->Controller? Pretty please?</p>
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