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POLinqToSQL A member defining the identity of the object cannot be changed
 

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  1. POLinqToSQL A member defining the identity of the object cannot be changed
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    <p>am trying to update an <code>Item</code> which some of it's members changed so am doing it like this </p> <pre><code>public void Update(IItem pItem) { using(GameDBDataContext db = new GameDBDataContext()) { Item old = db.Items.SingleOrDefault(x =&gt; x.id == pItem.Id); if(old != null) { Item item = pItem as Item; old.id = item.id; old.type = item.type; old.owner_id = item.owner_id; old.player_id = item.player_id; old.currentdura = item.currentdura; old.maxdura = item.maxdura; old.location = item.location; old.socketprogress = item.socketprogress; old.firstsocket = item.firstsocket; old.secondsocket = item.secondsocket; old.effect = item.effect; old.composition = item.composition; old.bless = item.bless; old.isfree = item.isfree; old.enchant = item.enchant; old.suspicious = item.suspicious; old.islocked = item.islocked; old.color = item.color; old.compositionprogress = item.compositionprogress; old.inscribed = item.inscribed; old.inscribetime = item.inscribetime; old.amount = item.amount; db.SubmitChanges(); } } } </code></pre> <p>but every time I try to update the item it throw this exception!</p> <pre><code>System.InvalidOperationException: Value of member 'location' of an object of typ e 'Item' changed. A member defining the identity of the object cannot be changed. Consider adding a new object with new identity and deleting the existing one ins tead. at System.Data.Linq.ChangeProcessor.CheckForInvalidChanges(TrackedObject trac ked) at System.Data.Linq.ChangeProcessor.SubmitChanges(ConflictMode failureMode) at System.Data.Linq.DataContext.SubmitChanges(ConflictMode failureMode) at Database.Managers.ItemManager.Update(IItem pItem) in d:\CProgramming\DarkS iders.Core\Database\Managers\ItemManager.cs:line 59 </code></pre> <p>not sure what is wrong here :-s!?</p>
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    1. USAbanoub
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    1. COTake a look in the database, is the location mapped to a column that's part of your primary key perhaps?
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      1. POLinqToSQL A member defining the identity of the object cannot be changed
      1. USflup
    2. COTake a look at this answer - http://stackoverflow.com/questions/5932299/how-to-update-a-aprimary-key-field-with-linq-to-sql
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      1. POLinqToSQL A member defining the identity of the object cannot be changed
      1. USDaniel Kelley
 

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