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POEntity Framework 4.1 Context in Extension Method
 

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  1. POEntity Framework 4.1 Context in Extension Method
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    <p>When I run this code it says that:</p> <pre><code>Store update, insert, or delete statement affected an unexpected number of rows (0). Entities may have been modified or deleted since entities were loaded. Refresh ObjectStateManager entries. </code></pre> <p>I can imagine the situation here. Probably because of this:</p> <pre><code>//Default.aspx.cs MyEntity cont = new MyEntity(); IEnumerable&lt;Product&gt; p = from c in cont.Products.AsEnumerable() select c; Product example = p.ToArray()[0]; example.Delete(); // This Delete method is an extension method which you'll see in below. //I also have some other stuff like IEnumerable&lt;Category&gt; cc = from n in cont.Categories.AsEnumerable() select n; cont.Categories.Remove(cc.ToArray()[0]); cont.SaveChanges(); //throws the error </code></pre> <p>Here is the main part of the extension method</p> <pre><code>public static bool Delete(this Product pro,bool SetNull = false) { using (var en = new MyEntity()) { IEnumerable&lt;Product&gt; s = from ss in en.Products where ss.ID == pro.ID select ss; en.Products.Remove(s.SingleOrDefault()); en.SaveChanges(); } } </code></pre> <p>The extension methods works, the entity removes from db. But when the program comes to the</p> <pre><code>cont.SaveChanges(); </code></pre> <p>line , it throws the error. I assume, this error comes up because i've changed the entities within some another method using another MyEntity() class. So i've searched to find a way to refresh the other one. But i couldn't ...</p>
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