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POCascade deletion in WCF Data Services
 

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    <p>Is it possible to delete persistent objects graph by the single command using WCF Data Services in Silverlight? I've started with <a href="http://msdn.microsoft.com/en-us/library/ee681615%28VS.95%29.aspx" rel="nofollow noreferrer">this walkthrough</a> and added code for deletion of selected order (which contains details):</p> <pre><code>private void deleteOrder_Click(object sender, RoutedEventArgs e) { Order deletedOrder = (Order)ordersGrid.SelectedItem; // Delete the selected order. svcContext.DeleteObject(deletedOrder); // Remove the deleted order from the binding collection. ordersGrid.SelectedIndex = ordersGrid.SelectedIndex == 0 ? 1 : ordersGrid.SelectedIndex - 1; ordersBindingCollection.Remove(deletedOrder); } </code></pre> <p>When I save changes back to server, delete request is issued:</p> <pre> --batch_2009b119-0747-4019-8974-8ea7dd29963a Content-Type: multipart/mixed; boundary=changeset_b451aecf-b66d-4f0f-8e6d-8a067646b350 --changeset_b451aecf-b66d-4f0f-8e6d-8a067646b350 Content-Type: application/http Content-Transfer-Encoding: binary DELETE http://localhost:55378/PurchasesService.svc/Orders(1) HTTP/1.1 Content-ID: 90 --changeset_b451aecf-b66d-4f0f-8e6d-8a067646b350-- --batch_2009b119-0747-4019-8974-8ea7dd29963a-- </pre> <p>But it fails on the database end with the foreign key constraint violation:</p> <pre> --batchresponse_b6c22c24-17ec-409b-ba91-91784116927d Content-Type: multipart/mixed; boundary=changesetresponse_41e6e873-a5dd-446d-bda0-99405ba92a63 --changesetresponse_41e6e873-a5dd-446d-bda0-99405ba92a63 Content-Type: application/http Content-Transfer-Encoding: binary HTTP/1.1 500 Internal Server Error Content-ID: 90 Cache-Control: no-cache DataServiceVersion: 1.0; Content-Type: application/xml &lt;?xml version="1.0" encoding="utf-8" standalone="yes"?&gt; &lt;error xmlns="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata"&gt; &lt;code&gt;&lt;/code&gt; &lt;message xml:lang="uk-UA"&gt;An error occurred while processing this request.&lt;/message&gt; &lt;/error&gt; --changesetresponse_41e6e873-a5dd-446d-bda0-99405ba92a63-- --batchresponse_b6c22c24-17ec-409b-ba91-91784116927d-- </pre> <p>I've also tried to set relation's <strong>OnDelete</strong> property to <strong>Cascade</strong> in .edmx</p> <p>Is it possible to make such deletions? Who should take care of deleting referenced objects: client or server? And how many delete requests should be sent to the server: one or N+1 (where N is number of details of given order). Maybe I'm missing some key point. Are there any WCF Data Services tutorials describing deletion of object graphs?</p>
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