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POASP.NET MVC Concurrency with RowVersion in Edit Action
 

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    <p>I'm wanting to do a simple edit form for our Issue Tracking app. For simplicity, the HttpGet Edit action looks something like this:</p> <pre><code> // Issues/Edit/12 public ActionResult Edit(int id) { var thisIssue = edmx.Issues.First(i =&gt; i.IssueID == id); return View(thisIssue); } </code></pre> <p>and then the HttpPost action looks something like this:</p> <pre><code> [HttpPost] public ActionResult Edit(int id, FormCollection form) { // this is the dumb part where I grab the object before I update it. // concurrency is sidestepped here. var thisIssue = edmx.Issues.Single(c =&gt; c.IssueID == id); TryUpdateModel(thisIssue); if (ModelState.IsValid) { edmx.SaveChanges(); TempData["message"] = string.Format("Issue #{0} successfully modified.", id); return RedirectToAction("Index"); } return View(thisIssue); } </code></pre> <p>Which works wonderfully. However, the concurrency check doesn't work because in the Post, I'm re-retreiving the current entity right before I attempt to update it. However, with EF, I don't know how to use the fanciness of <code>SaveChanges()</code> but attach my <code>thisIssue</code> to the context. I tried to call <code>edmx.Issues.Attach(thisIssue)</code> but I get </p> <pre><code>The object cannot be attached because it is already in the object context. An object can only be reattached when it is in an unchanged state. </code></pre> <p>How do I handle concurrency in MVC with EF and/or how do I properly <code>Attach</code> my edited object to the context?</p> <p>Thanks in advance</p>
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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.

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