I have a ComboBox Binded to a List of Possible values is the ViewModel.
<ComboBox ItemsSource="{Binding PossibleOperands}" SelectedValue="{Binding Operand, Mode=TwoWay}" VerticalAlignment="Center" Foreground="Black" FontSize="13" FontFamily="Calibri" Height="23" Grid.Column="1" Margin="7,2,0,2"/>
For most values I want the display a simple string (in The example above, "Operand Name"), but for one of the values, I want to display a string + 2 comboBoxes.
Mockup:
I have done something like that before:
Assuming you have a class like this: (for the ComboBox's Content)
public class Content
{
private String _Texty;
public String Texty
{
get{return _Texty;}
set { _Texty = value; }
}
public List<String> Comb1{get ; set;}
public List<String> Comb2 { get; set; }
public Content(string t, List<String> comb1, List<String> comb2)
{
Texty = "Some Text";
Comb1 = comb1;
Comb2 = comb2;
}
}
You will need a Converter, defined in your xaml part like this:
<utils:ContentToVisibleConverter x:Key="MyConverter" />
where utils is something like:
xmlns:utils="clr-namespace:YOUR CONVERTER CLASS NAMESPACE"
So, define your Combobox like this in the xaml:
<ComboBox x:Name="Combo" Margin="4"
Height="23"
Width="250" ItemsSource="{Binding Collection}" >
<ComboBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal" >
<TextBlock Text="{Binding Texty}" Margin="4,0"/>
<Grid Margin="20 0 0 0">
<Grid.ColumnDefinitions>
<ColumnDefinition />
<ColumnDefinition />
<ColumnDefinition />
<ColumnDefinition />
</Grid.ColumnDefinitions>
<TextBlock Grid.Column="0" Text="Entity Type:"
Visibility="{Binding Path=Comb1, Converter={StaticResource MyConverter}}" />
<ComboBox Grid.Column="1" ItemsSource="{Binding Comb1}" Width="80" Margin="4,0"
Visibility="{Binding Path=Comb1, Converter={StaticResource MyConverter}}"/>
<TextBlock Grid.Column="2" Text="Entity:"
Visibility="{Binding Path=Comb2, Converter={StaticResource MyConverter}}"/>
<ComboBox Grid.Column="3" ItemsSource="{Binding Comb2}" Width="80" Margin="4,0"
Visibility="{Binding Path=Comb2, Converter={StaticResource MyConverter}}"/>
</Grid>
</StackPanel>
</DataTemplate>
</ComboBox.ItemTemplate>
</ComboBox>
Somewhere in my code, I use a Binding Collection this way:
private ObservableCollection<Content> _Collection;
public ObservableCollection<Content> Collection
{
get { return _Collection; }
set { _Collection = value; NotifyPropertyChanged("Collection"); }
}
// Fill it like this:
Collection = new ObservableCollection<Content>();
Collection.Add(new Content("Some Stuff", null, null));
Collection.Add(new Content("Some Stuff", null, null));
Collection.Add(new Content("Some Stuff", null, null));
Collection.Add(new Content("Some Stuff",
new List<String>() { "One", "Two" },
new List<String>() { "One", "Two" }));
Finally, I define a class for the converter it only contains:
public class ContentToVisibleConverter : System.Windows.Markup.MarkupExtension, IValueConverter
{
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
var s = value as List<string>;
if (s != null)
return s.Count > 0 ? Visibility.Visible : Visibility.Collapsed;
else return Visibility.Collapsed;
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
return null;
}
public override object ProvideValue(IServiceProvider serviceProvider)
{
return this;
}
}
That's all, let me know if it worked for you.
