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POUpdating LINQ to SQL object causing System.NotSupportedException
 

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    <p>I get <code>System.NotSupportedException: An attempt has been made to Attach or Add an entity that is not new perhaps having been loaded from another DataContext</code> when I want to update an object's with child entities.</p> <p>The scenario is like this:</p> <p>I have a SubscriberProvider that allows me to create subscribers.</p> <pre><code>var provider = new SubscriberProvider(); // Creates a new repository with own datacontext var newSubscriber = new Subscriber { EmailAddress = emailAddress, }; newSubscriber.Interests.Add(new Interest{ Id=1, Name="cars" }); provider.Subscribe(newSubscriber); </code></pre> <p>On a normal subscribe page, this works fine.</p> <p>Now I have a linq2sql Member class(retrievable by a MemberRepository) and I want to extend it to have a helper subscribe method like so:</p> <pre><code>var repository = new MembershipRepository(); // Holds its own datacontext var member = repository.Get("member1"); member.Subscribe(); // transfer member's info and interests to subscriber's table </code></pre> <p>The exception occurs when SubscriberProvider tries to add interests of the member. Commenting out</p> <pre><code>newSubscriber.Interests.Add(new Interest{ Id=1, Name="cars" }); </code></pre> <p>will make member.Subscribe() work.</p> <p>member.Subscribe() is simply:</p> <pre><code> public void Subscribe(bool emailIsVerified, bool receiveEmails, bool sendDoubleOptIn) { var provider = new MailingListProvider(); provider.Subscribe(EmailAddress, emailIsVerified, receiveEmails, CountryId, sendDoubleOptIn, ConvertInterests(MemberInterests.ToList())); } </code></pre> <p>So what's causing the child entities(Interests) to lose their datacontext when I do member.Subscribe() and how do I go about fixing this?</p>
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    1. USzulkamal
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      1. VTUpMod
    1. COShow the code for `member.Subscribe`
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      1. USAviad P.
    2. COadded as requested
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      1. USzulkamal
 

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