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POEntity Framework Code-First: "The ObjectStateManager cannot track multiple objects with the same key."
 

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  1. POEntity Framework Code-First: "The ObjectStateManager cannot track multiple objects with the same key."
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    <p>I'm running into an issue with Entity Framework code-first in MVC3. I'm hitting this exception:</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>This is addressed many times on SO, but I'm having trouble utilizing any of the suggested solutions in my situation.</p> <p>Here is a code sample:</p> <pre><code>FestORM.SaleMethod method = new FestORM.SaleMethod { Id = 2, Name = "Test Sale Method" }; FestContext context = new FestContext(); //everything works without this line: string thisQueryWillMessThingsUp = context.SaleMethods.Where(m =&gt; m.Id == 2).Single().Name; context.Entry(method).State = System.Data.EntityState.Modified; context.SaveChanges(); </code></pre> <p><em>EDITED to clarify:</em> I am attempting to update an object that already exists in the database.</p> <p><strong>Everything works fine without the query noted in the code.</strong> In my application, my controller is instantiating the context, and that same context is passed to several repositories that are used by the controller--so I am not able to simply use a different context for the initial query operation. I've tried to remove the entity from being tracked in the ObjectStateManager, but I can't seem to get anywhere with that either. I'm trying to figure out a solution that will work for both conditions: sometimes I will be updating an object that is tracked by the ObjectStateManager, and sometimes it will happen to have not been tracked yet.</p> <p>FWIW, my real repository functions look like this, just like the code above:</p> <pre><code>public void Update(T entity) { //works ONLY when entity is not tracked by ObjectStateManager _context.Entry(entity).State = System.Data.EntityState.Modified; } public void SaveChanges() { _context.SaveChanges(); } </code></pre> <p>Any ideas? I've been fighting this for too long...</p>
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