WPF MultiBinding Ellipse Fill - wpf

Question

I am not able to get MultiBinding on Ellipse.Fill working correctly. I do have (single) Binding working correctly, plus MultiBinding on Ellipse.Tooltip:
<Ellipse Margin="210,56,0,0" Fill="{Binding InspectorPC, Converter={StaticResource statusButtonConverter}, Mode=OneWay}">
<Ellipse.ToolTip>
<MultiBinding Converter="{StaticResource statusStringConverter}" Mode="OneWay">
<Binding Path="InspectorPC"/>
<Binding Path="InspectorPCPing"/>
<Binding Path="InspectorPCReadHD"/>
</MultiBinding>
</Ellipse.ToolTip>
</Ellipse>
but I would like something like:
<Ellipse Margin="210,56,0,0">
<Ellipse.Fill>
<MultiBinding Converter="{StaticResource statusButtonConverter}" Mode="OneWay">
<Binding Path="InspectorPCPing"/>
<Binding Path="InspectorPCReadHD"/>
</MultiBinding>
</Ellipse.Fill>
<Ellipse.ToolTip>
<MultiBinding Converter="{StaticResource statusStringConverter}" Mode="OneWay">
<Binding Path="InspectorPC"/>
<Binding Path="InspectorPCPing"/>
<Binding Path="InspectorPCReadHD"/>
</MultiBinding>
</Ellipse.ToolTip>
</Ellipse>
(Obviously statusButtonConverter would need to be changed from IValueConverter to IMultiValueConverter, but that is not the issue.)

Answer 1

If this isn't working, it suggests a problem in your statusButtonConverter implementation.
A simple example shows no problem applying a MultiBinding to Ellipse.Fill:
<Window x:Class="WpfTest.FillMultiBinding"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:l="clr-namespace:WpfTest2"
Width="320"
Height="160">
<Window.Resources>
<l:BrushPartsConverter x:Key="brushPartsConverter" />
</Window.Resources>
<Window.DataContext>
<l:FillViewModel />
</Window.DataContext>
<Ellipse>
<Ellipse.Fill>
<!-- Dodger + Blue = DodgerBlue -->
<MultiBinding Converter="{StaticResource brushPartsConverter}" Mode="OneWay">
<Binding Path="Part1" />
<Binding Path="Part2" />
</MultiBinding>
</Ellipse.Fill>
</Ellipse>
</Window>
public class FillViewModel
{
public string Part1 => "Dodger";
public string Part2 => "Blue";
}
public class BrushPartsConverter : IMultiValueConverter
{
private static readonly BrushConverter InnerConverter = new BrushConverter();
public object Convert(object[] values, Type type, object p, CultureInfo c)
{
if (values?.Length == 2)
return InnerConverter.ConvertFrom("" + values[0] + values[1]);
return DependencyProperty.UnsetValue;
}
public object[] ConvertBack(object value, Type[] types, object p, CultureInfo c)
{
return new[] { DependencyProperty.UnsetValue };
}
}
Post the code for your converter and binding context (view model), and we'll see what we can do.