Vincolante con RelativeSource --wpf

Question

ho una breve domanda:

Ho un datagrid e binded a qualcosa. Poi ho messo un combobox in una colonna e rilegata ad un altro di origine

ItemsSource="{Binding DataContext.Users, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGrid}}}" 

Ora voglio usare del datagrid fonte di nuovo, nella casella combinata again.That codice ora non funziona più e so che c'è una colonna ID nella fonte di DataGrid.

SelectedValue="{Binding ID}"

Come posso risolvere il problema? Grazie in anticipo.

E qui è tutta la mia DataGrid e la parte problematica è la combobox.

 <DataGrid ItemsSource="{Binding SCs}" SelectedItem="{Binding SelectedSC}" Margin="0,10,0,0"
            RowStyle="{StaticResource ResourceKey=DataGridRowStyle}" Style="{DynamicResource ResourceKey=UILDataGridStyle}" AutoGenerateColumns="False" EnableRowVirtualization="True" 
            RowDetailsVisibilityMode="VisibleWhenSelected" Width="Auto" IsReadOnly="True" Background="Transparent"
            VerticalAlignment="Stretch" HorizontalAlignment="Stretch" GridLinesVisibility="Vertical" VerticalGridLinesBrush="{DynamicResource ResourceKey=UILBorderBrush}"
            RowHeaderWidth="0" HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto" BorderBrush="{DynamicResource ResourceKey=UILBorderBrush}"
            BorderThickness="1" SelectionUnit="FullRow" SelectionMode="Single" x:Name="SCDataGrid">
        <DataGrid.Columns>
            <DataGridTextColumn x:Name="securityConfigurationIDColumn"  Binding="{Binding Path=SecurityConfigurationID}" Header="Security Configuration ID" Width="*" />
            <DataGridTextColumn x:Name="securityConfigurationNameColumn" Binding="{Binding Path=SecurityConfigurationName}"  Header="Security Configuration Name" Width="*" />
            <DataGridTemplateColumn x:Name="proxyResponsibleUser_IDColumn"   Header="Proxy Responsible User ID" Width="*" >
                <DataGridTemplateColumn.CellTemplate>
                    <DataTemplate>
                        <ComboBox IsEnabled="True"  ItemsSource="{Binding DataContext.Users, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGrid}}}"
                                  SelectedValuePath="{Binding UserID}"  DisplayMemberPath="{Binding FullName}" Width="117" Height="20" 
                                  SelectedValue="{Binding ProxyResponsibleUser_ID, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ComboBox}}, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}" />

                    </DataTemplate>
                </DataGridTemplateColumn.CellTemplate>
            </DataGridTemplateColumn>

            <DataGridTextColumn x:Name="responsibleUser_IDColumn" Binding="{Binding Path=User.FullName}" Header="Responsible User ID" Width="*" />
            <DataGridTextColumn x:Name="securityConfigurationDescriptionColumn" Binding="{Binding Path=SecurityConfigurationDescription}" Header="Security Configuration Description" Width="*" />
            <DataGridTextColumn x:Name="securityConfigurationURLColumn" Binding="{Binding Path=SecurityConfigurationURL}" Header="Security Configuration URL" Width="*" />
        </DataGrid.Columns>
    </DataGrid> 

Answer 1

Usa sotto modello cellulare per casella combinata.

Questo codice si lega intera origine dati griglia per modello casella combinata, che consentono di utilizzare qualsiasi proprietà senza fare la giocoleria di trovare antenati ..

<DataGridTemplateColumn.CellTemplate>
                <DataTemplate>
                    <Grid DataContext="{Binding }">
                       <ComboBox IsEnabled="True"  
                              ItemsSource="{Binding Users}"                   
                              SelectedValuePath="{Binding UserID}"  
                              DisplayMemberPath="{Binding FullName}"
                              Width="117" Height="20"  
                              SelectedValue="{Binding ProxyResponsibleUser_ID,
                             UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}"/>
                    </Grid>
                </DataTemplate>
            </DataGridTemplateColumn.CellTemplate>