All ComboBoxes in a ListBox change when any of 1 of them changes

Question

I have ListBoxa form related to a ObservableCollectioncustom type. Within each element there is a binding ComboBoxto the type of enumeration. When a window loads, all ComboBoxes have a default value. When I change SelectedItemfor any (from the user interface, not from the code), all other ComboBoxes change to the same one SelectedItem.

I'm not sure what I did wrong, here is my current XAML that handles this.

<Window.Resources>
    <ObjectDataProvider x:Key="SyncOperationValues"
                        MethodName="GetNames"
                        ObjectType="{x:Type sys:Enum}">
        <ObjectDataProvider.MethodParameters>
            <x:Type TypeName="local:SyncOperationEnum" />
        </ObjectDataProvider.MethodParameters>
    </ObjectDataProvider>
...
    <DataTemplate x:Key="SyncListTemplate">
        <Grid Grid.Column="1" Grid.RowSpan="2" Margin="0,0,20,0" x:Name="olDetails"
            DataContext="{Binding Path=OlContact}">
            <Grid.RowDefinitions>
                <RowDefinition />
                <RowDefinition />
                <RowDefinition />
                <RowDefinition />
                <RowDefinition />
                <RowDefinition />
            <RowDefinition />
            </Grid.RowDefinitions>
...
            <ComboBox x:Name="SyncOp" 
                Width="120" Height="19"
                Margin="4,0,10,0" 
                IsSynchronizedWithCurrentItem="True" 
                ItemsSource="{Binding Source={StaticResource SyncOperationValues}}"
                             SelectedItem="{Binding Operation}"
                             VerticalAlignment="Center" />

...

and ListBox:

 <ListBox x:Name="SyncList"
     ScrollViewer.HorizontalScrollBarVisibility="Hidden"
     ItemContainerStyle="{StaticResource StretchedContainerStyle}"
     ItemTemplate="{StaticResource SyncListTemplate}">
 ListBox>

I tried several different options, such as binding to CollectionView; however, nothing works. Can someone point me to my mistake?

Thanks!

Answer 1

- . ValueConverter . , , - , , ComboBox (ListBox ).

IsSynchronizedWithCurrentItem false, , ! , - - .

[ValueConversion( typeof( SyncOperationEnum ), typeof( String ) )]
public class SyncOperationConverter : IValueConverter {
    #region IValueConverter Members

    public object Convert( object value, Type targetType, object parameter, System.Globalization.CultureInfo culture ) {
        if( value != null && value.GetType() == typeof( SyncOperationEnum ) )
            return Enum.GetName( typeof( SyncOperationEnum ), value );

        return null;
    }

    public object ConvertBack( object value, Type targetType, object parameter, System.Globalization.CultureInfo culture ) {
        if( value != null && targetType == typeof( SyncOperationEnum ) )
            foreach( object enumValue in Enum.GetValues( targetType ) )
                if( value.Equals( Enum.GetName( targetType, enumValue ) ) )
                    return enumValue;

        return null;
    }

    #endregion

XAML :

<Window.Resources>
    <local:SyncOperationConverter x:Key="SyncConverter" />

    <ObjectDataProvider x:Key="SyncOperationValues"
                    MethodName="GetNames"
                    ObjectType="{x:Type sys:Enum}">
        <ObjectDataProvider.MethodParameters>
            <x:Type TypeName="local:SyncOperationEnum" />
        </ObjectDataProvider.MethodParameters>
    </ObjectDataProvider>
...
<DataTemplate x:Key="SyncListTemplate">
    <Grid Grid.Column="1" Grid.RowSpan="2" Margin="0,0,20,0" x:Name="olDetails"
        DataContext="{Binding Path=OlContact}">
        <Grid.RowDefinitions>
            <RowDefinition />
            <RowDefinition />
            <RowDefinition />
            <RowDefinition />
            <RowDefinition />
            <RowDefinition />
        <RowDefinition />
        </Grid.RowDefinitions>
...
        <ComboBox x:Name="SyncOp" 
            Width="120" Height="19"
            Margin="4,0,10,0" 
            IsSynchronizedWithCurrentItem="False" 
            ItemsSource="{Binding Source={StaticResource SyncOperationValues}}"
            SelectedValue="{Binding Path=Operation,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged,Converter={StaticResource SyncConverter}}"
            VerticalAlignment="Center" />

Answer 2

, , IsSynchronizedWithCurrentItem ComboBox "False" . , , "True", , ComboBox ListBox. , ComboBoxes . , , . :

IsSynchronizedWithCurrentItem="False"

Answer 3

It looks like your "Operation" property should be Static. Since it binds to every ComboBox when it changes, So, everything else is right in your XAML, just create a property like bellow

    static SyncOperationEnum _operation;

    public static SyncOperationEnum Operation
    {
        get { return _operation; }
        set { _operation = value;}
    }