wpf specify multiple DataBindings in Groupbox IsEnabled Property - wpf

Question

I have a GroupBox whose IsEnabled Property is set via a property on the ViewModel as under:-
<GroupBox>
<Canvas IsEnabled="{Binding CurrentRec.Current_Selected_Category.NoBonus,Converter={StaticResource TFC}}">
<Label Content="Amount:" Width="55" Canvas.Left="9" Canvas.Top="-2"/>
<TextBox x:Name="txtBonusAmount" Width="76" Canvas.Left="12" Canvas.Top="20" Text="Some text"/>
<Label Content="Bonus:" Canvas.Top="38" Width="54" Canvas.Left="10"/>
<TextBox x:Name="txtBonus" Width="76" Canvas.Left="13" Canvas.Top="58" Text="Some Text"/>
</Canvas>
<Groupbox>
There are more than one properties in my viewmodel affecting the IsEnabled property of Canvas.How do i specify those additional properties against the IsEnabled property of Canvas?

Answer 1

Use a MultiBinding with a converter:
<GroupBox>
<GroupBox.Resources>
<local:MultiConverter x:Key="conv" />
</GroupBox.Resources>
<Canvas>
<Canvas.IsEnabled>
<MultiBinding Converter="{StaticResource conv}">
<Binding Path="CurrentRec.Current_Selected_Category.NoBonus" />
<Binding Path="TheOtherProperty" />
</MultiBinding>
</Canvas.IsEnabled>
<Label Content="Amount:" Width="55" Canvas.Left="9" Canvas.Top="-2"/>
<TextBox x:Name="txtBonusAmount" Width="76" Canvas.Left="12" Canvas.Top="20" Text="Some text"/>
<Label Content="Bonus:" Canvas.Top="38" Width="54" Canvas.Left="10"/>
<TextBox x:Name="txtBonus" Width="76" Canvas.Left="13" Canvas.Top="58" Text="Some Text"/>
</Canvas>
</GroupBox>
The converter class should implement the IMultiValueConverter interface and return a bool from the Convert method:
public class MultiConverter : IMultiValueConverter
{
public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
{
bool noBonus = System.Convert.ToBoolean(values[0]);
bool theOtherSourceProperty = System.Convert.ToBoolean(values[1]);
//..
return noBonus && theOtherSourceProperty;
}
public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
{
throw new NotSupportedException();
}
}