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PODomain Service Named Method Update not working
 

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  1. PODomain Service Named Method Update not working
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    <p>I am using VS 2010 and Silverlight 4 and WCF RIA v1</p> <p>I am getting a strange error when I try to use a named update method in the domain service. </p> <p>This is the error:</p> <p>"Message: Unhandled Error in Silverlight Application *<em>Submit operation failed. Value cannot be null.</em>*Parameter name: original at System.ServiceModel.DomainServices.EntityFramework.ObjectContextExtensions."</p> <p>Error happens here in the domain service this.ObjectContext.Prospects.AttachAsModified(p, this.ChangeSet.GetOriginal(p));</p> <p>I have read the change documentation for WCF and I think I am doing everything right.</p> <p>Could someone please help me to figure out wha is going on?</p> <p>Cheers</p> <p>This is the code explanation:</p> <h2>Client</h2> <p>.....</p> <pre><code>&lt;riaControls:DomainDataSource.DomainContext&gt; &lt;my:MarketingDomainContext /&gt; &lt;/riaControls:DomainDataSource.DomainContext&gt; </code></pre> <p>.....</p> <pre><code>&lt;Grid x:Name="LayoutRoot" Background="White"&gt; &lt;Grid DataContext="{Binding ElementName=comboBoxProspects, Path=SelectedItem}" Name="gdProspects" Margin="10"&gt; </code></pre> <p>....... .......</p> <p>I grab the Prospects entity from the Grid.</p> <p>I have tried to call the named update method using both the context declared globally and the update method int Entity.</p> <pre><code>public partial class MainPage : UserControl { MarketingDomainContext ctx; private void dsProspects_LoadedData(object sender, LoadedDataEventArgs e) { ctx = (MarketingDomainContext)dsProspects.DomainContext; } private void btnSubmit2_Click(object sender, RoutedEventArgs e) { //((Prospect)gdProspects.DataContext).CalculateProspectValue( // int.Parse(tbNumber1.Text), int.Parse(tbNumber2.Text)); var tempProsp = gdProspects.DataContext as Prospect; ctx.CalculateProspectValue(tempProsp, int.Parse(tbNumber1.Text), int.Parse(tbNumber2.Text)); ctx.SubmitChanges(); } </code></pre> <h2>Domain Service method</h2> <pre><code>[Update(UsingCustomMethod=true)] public void CalculateProspectValue(Prospect p, int a, int b) { p.Comments = "Value = " + a * b; // Error happens here this.ObjectContext.Prospects.AttachAsModified(p, this.ChangeSet.GetOriginal(p)); } public void UpdateProspect(Prospect currentProspect) { this.ObjectContext.Prospects.AttachAsModified(currentProspect, this.ChangeSet.GetOriginal(currentProspect)); } </code></pre>
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