So i am at a complete loss why the exact same binding works for one element but not another (on the same control, code for binding is copy and pasted).
I have made a MultiValueConverter that takes in 4 values. values[0] determines which one of the values[1-3] should be returned. (Ternary logic)
This converter works great. I use this to choose which color and image a control should have based on an enum. But, when using the same converter for tooltip to choose between string, then i get a binding error.
The weird thing is that is that when i use the same converter inside a template for choosing which string for the ToolTip, then it works! The exact same code copy and pasted.
When i bind with the ToolTip (not in a template) the value[0] is "{DependencyProperty.UnsetValue}", instead of the enum that i have binded to.
Code inside a UserControl)
<v:ColoredImage Width="20" Height="20" HorizontalAlignment="Right">
<v:ColoredImage.Color> //THIS WORKS
<MultiBinding Converter="{StaticResource TernaryConverter}">
<Binding Path="ParamStatus" ElementName="pn"/> <-- SAME BINDING
<Binding Source="{StaticResource GreenLight}"/>
<Binding Source="{StaticResource YellowLight}"/>
<Binding Source="{StaticResource RedLight}"/>
</MultiBinding>
</v:ColoredImage.Color>
<v:ColoredImage.Image> // THIS WORKS
<MultiBinding Converter="{StaticResource TernaryConverter}">
<Binding Path="ParamStatus" ElementName="pn"/> <-- SAME BINDING
<Binding Source="{StaticResource OkIcon}"/>
<Binding Source="{StaticResource WarningIcon}"/>
<Binding Source="{StaticResource ErrorIcon}"/>
</MultiBinding>
</v:ColoredImage.Image>
<v:ColoredImage.ToolTip>
<ToolTip> //THIS PART DOES NOT WORK
<MultiBinding Converter="{StaticResource TernaryConverter}">
<Binding Path="ParamStatus" ElementName="pn"/> <-- SAME BINDING
<Binding Source="OK"/>
<Binding Source="Not Synced"/>
<Binding Source="ERROR"/>
</MultiBinding>
</ToolTip>
</v:ColoredImage.ToolTip>
</v:ColoredImage>
Code Inside a Style and ControlTemplate (this code work, even though it is the same)
<v:ColoredImage Height="24" Width="24" Margin="65,65,0,0" VerticalAlignment="Center">
<v:ColoredImage.Color>
<MultiBinding Converter="{StaticResource TernaryConverter}">
<Binding Path="Status" RelativeSource="{RelativeSource TemplatedParent}"/>
<Binding Source="{StaticResource GreenLight}"/>
<Binding Source="{StaticResource YellowLight}"/>
<Binding Source="{StaticResource RedLight}"/>
</MultiBinding>
</v:ColoredImage.Color>
<v:ColoredImage.Image>
<MultiBinding Converter="{StaticResource TernaryConverter}">
<Binding Path="Status" RelativeSource="{RelativeSource TemplatedParent}"/>
<Binding Source="{StaticResource OkIcon}"/>
<Binding Source="{StaticResource UnidentifiedIcon}"/>
<Binding Source="{StaticResource ErrorIcon}"/>
</MultiBinding>
</v:ColoredImage.Image>
<v:ColoredImage.ToolTip>
<ToolTip>
<MultiBinding Converter="{StaticResource TernaryConverter}">
<Binding Path="Status" RelativeSource="{RelativeSource TemplatedParent}"/>
<Binding Source="OK"/>
<Binding Source="Unidentified"/>
<Binding Source="ERROR"/>
</MultiBinding>
</ToolTip>
</v:ColoredImage.ToolTip>
</v:ColoredImage>
I could fix this by doing a style/template for my first UserControl. But i feel like i shouldnt have too, and either way i wanna know why the EXACT same code works in one place but not another. I'm completely dumbfounded.
Code for the Converter, this is not where problem occurs, but i figured someone is going to ask me to post it anyway:
public class TernaryConverter : IMultiValueConverter
{
public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
{
int index = (int)values[0];
if (index < 0 || index > 2)
{
return values[1];
}
return values[index+1];
}
public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
{
throw new InvalidOperationException("EnumToImageConverter can only be used OneWay.");
}
}
