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POentity-framework error: An object with the same key already exists in the ObjectStateManager
 

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  1. POentity-framework error: An object with the same key already exists in the ObjectStateManager
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    <p>I got thiserror</p> <blockquote> <p>An object with the same key already exists in the ObjectStateManager. The ObjectStateManager cannot track multiple objects with the same key.</p> </blockquote> <p>only because this line</p> <pre><code>oldProject = db.Projectes.Find(project.ID); </code></pre> <p><strong>I need it in order to get the object before the edit, and afterwards compare the values changes between before and after the edit</strong>, I do it in the third if statement (that compare one values), and in the "SFSiteEmailSend.ProjectEdited" function that only check the changes and send email about it.</p> <p>By the way, I never change the "oldproject", the error still exist even if I delete all the email funcation and the third(last) if statement.</p> <pre><code> // POST: /Project/Edit/5 [HttpPost] [ValidateAntiForgeryToken] public ActionResult Edit(Project project) { if (ModelState.IsValid) { // For Email Send - start string UrlProject = Request.Url.GetLeftPart(UriPartial.Authority) + Url.Action("Detail", "Project", new { id = project.ID }); Project oldProject = new Project(); Project newProject = new Project(); newProject = project; oldProject = db.Projectes.Find(project.ID); SFSiteEmailSend.ProjectEdited(oldProject, newProject, UrlProject); // For Email Send - end if (oldProject.Finished == false &amp;&amp; newProject.Finished == true) { project.DateFinished = DateTime.Now; } db.Entry(project).State = EntityState.Modified; db.SaveChanges(); return RedirectToAction("Index"); } return View(project); } </code></pre>
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    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USDaniel Ezra
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
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      1. PTAnswer
    2. PO
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      1. PTAnswer
    1. This table or related slice is empty.
    1. COI've run into this error message before. In my case, it's because of the fact that EF adds all objects to the object graph. So if I had attached items to a primary object (e.g. OrderLineItems to Order) and the ID's were 0, it would throw this error. Make sure Project() doesn't instantiate any related objects.
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      1. POentity-framework error: An object with the same key already exists in the ObjectStateManager
      1. USBlackjacketMack
    2. COWhat is the lifespan of your context? And does the error occur on the line `oldProject = db.Projectes.Find(project.ID);`? (_because this line_ is not clear about this).
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      1. POentity-framework error: An object with the same key already exists in the ObjectStateManager
      1. USGert Arnold
 

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