CODEWITHSUNDEEP
.netwpfdata-bindingdatagridcombobox
poordba
poordba

Reputation: 21

WPF ComboBox in DataGrid Doesn't Display Selected Value

I have a datagrid with a template column and a combobox inside it. I also have another combobox which is not inside the datagrid:

<DataGrid AutoGenerateColumns="False" EnableRowVirtualization="True" 
        ItemsSource="{Binding Source={StaticResource asientoDetallesAsientosViewSource}}" 
        Name="detallesAsientosDataGrid" RowDetailsVisibilityMode="VisibleWhenSelected" >
<DataGrid.Columns>
    <DataGridTemplateColumn Header="Cuenta">
        <DataGridTemplateColumn.CellEditingTemplate>
            <DataTemplate>
                <ComboBox Grid.Column="1" Grid.Row="0" 
                            Name="combo1"
                            ItemsSource="{Binding Source={StaticResource cuentaListaViewSource}}"
                            SelectedValuePath="Numero"
                            DisplayMemberPath="Nombre"
                            SelectedValue="{Binding ElementName=detallesAsientosDataGrid, Path=SelectedItem.Numero}">
                    <ComboBox.ItemsPanel>
                        <ItemsPanelTemplate>
                            <VirtualizingStackPanel />
                        </ItemsPanelTemplate>
                    </ComboBox.ItemsPanel>
                </ComboBox>
            </DataTemplate>
        </DataGridTemplateColumn.CellEditingTemplate>
        <DataGridTemplateColumn.CellTemplate>
            <DataTemplate>
                <TextBlock Text="{Binding Path=Numero}" />
            </DataTemplate>
        </DataGridTemplateColumn.CellTemplate>
    </DataGridTemplateColumn>
</DataGrid.Columns>
</DataGrid>
<ComboBox Name="combo2"
            ItemsSource="{Binding Source={StaticResource cuentaListaViewSource}}"  
            SelectedValuePath="Numero"
            DisplayMemberPath="Nombre"
            SelectedValue="{Binding ElementName=detallesAsientosDataGrid,
                            Path=SelectedItem.Numero}"
            VerticalAlignment="Center" Width="120">
    <ComboBox.ItemsPanel>
        <ItemsPanelTemplate>
            <VirtualizingStackPanel />
        </ItemsPanelTemplate>
    </ComboBox.ItemsPanel>
</ComboBox>

Now the strange thing and the problem is that in this case the combo1 inside the datagrid, when in edit mode, shows correctly the selected row value BUT if I delete the combo2 the combo1 stops working and doesn't anymore show the selected row value but instead the first value of the combobox list.

Why does it happen? The combo2 is exactly the same combobox as the combo1.

Upvotes: 1

Views: 1369

Answers (1)

paparazzo
paparazzo

Reputation: 45096

They both bind to the same SelectedValue. If you delete (edit) the SelectedValue then the selected value is no longer in the ItemsSource. If you select (not edit) a value from the pull down does it work?

Upvotes: 1

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