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POWPF SelectionChange Event for ComboBox with Binding from database crashes the Program
 

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    <p>I've got a big issue trying to modify the ItemSource for a ComboBox. When I try to debug the app by putting a breakpoint on MessageBox.Show(...) in the Sub cboTest_SelectionChanged (see below), I get this error:</p> <pre><code>An Unhandled exception of type 'System.InvalidCastException' occured in Data.exe Additional Information: Unable to cast object of type 'System.Data.DataRowView' to type 'System.Windows.Controls.ComboBoxItem' </code></pre> <p>How can I fix this?</p> <p>Here's what I do. I create an ACCESS 2007 Database named SNIGDoFFE.accdb, my solution is named <strong>Data</strong>, I added the Database through the <strong>Add New Source Configuration wizard</strong> and I drag and drop the Field <strong>"Libelle"</strong> from the Table <strong>Ethnie</strong> to the the ComboBox, so it modifies my files like this:</p> <p>In MainWindow.xaml.vb</p> <pre><code>Private Sub Window_Loaded(sender As Object, e As RoutedEventArgs) Handles MyBase.Loaded Dim SNIGDoFFEDataSet As Data.SNIGDoFFEDataSet = CType(Me.FindResource("SNIGDoFFEDataSet"), Data.SNIGDoFFEDataSet) 'Load data into the table Ethnie. You can modify this code as needed. Dim SNIGDoFFEDataSetEthnieTableAdapter As Data.SNIGDoFFEDataSetTableAdapters.EthnieTableAdapter = New Data.SNIGDoFFEDataSetTableAdapter.EthnieTableAdapter() SNIGDoFFEDataSetEthnieTableAdapter.Fill(SNIGDoFFEDataSet.Ethnie) Dim EthnieViewSource As System.Windows.Data.CollectionViewSource = CType(Me.FindResource("EthnieViewSource"), System.Windows.Data.CollectionViewSource) 'EthnieViewSource.View.MoveCurrentToFirst 'I comment this line to leave the combobox empty End Sub </code></pre> <p>The code for cboTest_SelectionChanged is:</p> <pre><code>Private Sub cboTesT_SelectionChanged(sender As Object, e As SelectionChangedEventArgs) Handles cboTesT.SelectionChanged MessageBox.Show(CType(cboTesT.SelectedItem, ComboBoxItem).Content) End Sub </code></pre> <p>In XAML:</p> <pre><code>&lt;ComboBox x:Name="cboTest" width="120" Margin"184,10,183,134" SelectionChanged="cboTest_SelectionChanged" DisplayMemberPath="Libelle" ItemSource="{Binding Source={StaticResource EthnieViewSource}}" /&gt; </code></pre> <p>In my Resources:</p> <pre><code>&lt;Window.Resources&gt; &lt;local:SNIGDoFFEDataSet x:Key"SNIGDoFFEDataSet" /&gt; &lt;CollectionViewSource x:Key="EthnieViewSource" Source="{Binding Ethnie, Source={StaticResources SNIGDoFFEDataSet}}" /&gt; &lt;/Window.Resources&gt; </code></pre> <p><strong>The Solution is built correctly, the main Window loaded correctly, but when I select an item in the combobox, the program crashes. I try to remove all binding and create Item with and everything work, but by binding the source from my database, it crashes again.</strong></p>
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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