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POLinq to SQL Foreign Keys & Collections
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Id
4520759
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0
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1
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CreationDate
2010-12-23T16:50:08.623
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2010-12-23T20:40:38.690
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2010-12-23T17:27:32.637
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479
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text
Body
<p>I'm a still trying to wrap myself around LINQ to SQL and foreign key relationships.</p> <p>I have a table called "Parent" and another called "Children". I have a OneToMany relationship, where a Parent can have multiple Children. My DBML looks something like:</p> <pre><code><Table Name="" Member="Parents"> <Type Name="Parent"> <Column Member="ParentID" Type="System.String" IsPrimaryKey="true" CanBeNull="false" /> <Column Member="ChildID" Type="System.String" CanBeNull="false" /> <Association Name="Parent_Child" Member="Childs" ThisKey="ParentID" OtherKey="ParentID" Type="Child" /> </Type> </Table> <Table Name="" Member="Childs"> <Type Name="Child"> <Column Member="ChildID" Type="System.String" IsPrimaryKey="true" CanBeNull="false" /> <Column Member="ParentID" Type="System.String" CanBeNull="false" /> <Association Name="Parent_Child" Member="Parent" ThisKey="ParentID" OtherKey="ParentID" Type="Parent" IsForeignKey="true" /> </Type> </Table> </code></pre> <p>In my code, I would like do to something like:</p> <pre><code>// parent has already been loaded from the datacontext parent.Childs = <some collection of children> db.SubmitChanges(); </code></pre> <p>But when I do that I get the following error: </p> <p><em>A member defining the identity of the object cannot be changed. Consider adding a new object with new identity and deleting the existing one instead.</em></p> <p>Can anyone tell me how to properly accomplish this?</p>
Tags
<linq-to-sql>
Title
Linq to SQL Foreign Keys & Collections
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1. COWere the child records retrieved using the same data context or a different one?
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  USRandy Minder
2. COThey were retrieved from the same datacontext.
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