Nested MultiBinding(s)

If you have a converter that takes a parameter, you can do something like this:

• Create a class for passing the "fixed" data to your converter
• Add DependencyProperties to the class (so that you can bind the values in Xaml)

• In your xaml, use a binding with a converter instead of a multibinding, something like this:

  <MultiBinding>    <Binding Source="SomeObject" Path="CoreValue" Converter="{StaticResource YourNewConverter}">        <Binding.ConverterParameter>            <ns:ParameterClass Value1="{Binding Parameter1}" Value2="{Binding Parameter1}" />        </Binding.ConverterParameter>    </Binding> .... 

The limitation is that (AFAIK) the value will only be recalculated if CoreValue changes - it won't automatically rebind if the converter parameters change.

(Apologies for any errors, I'm typing this without the benefit of VS to test in...)

I realise that this is an old question now, but I just hit exactly the same problem as the OP. Fortunately in my case I could bind to a sub-element where the result of the multi-binding was already being calculated, but it got me thinking...

A (though admittedly not very clean) solution would be to write the value of the multi-value binding into a 'spare' property such as an element's 'Tag' which you can then reference in your other multi-value bindings by specifying the 'ElementName' attribute.

If you need more than a single nested multi-value binding then you could create a 'fake' object with some dependency properties on it to store multiple intermediate results.

A pity that Microsoft don't implement a properly nested system...

I know that this is an old question but I think this this is a much nicer approach:

<FrameworkElement x:Name="IsBuyAndAmountInReference">    <FrameworkElement.Tag>        <MultiBinding Converter="{StaticResource LogicAndToBool}">            <Binding Path="OrderData.IsBuy" />            <Binding Path="OrderData.AmountInReference" />        </MultiBinding>    </FrameworkElement.Tag></FrameworkElement><FrameworkElement x:Name="IsSellAndAmountInBase">    <FrameworkElement.Tag>        <MultiBinding Converter="{StaticResource LogicAndToBool}">            <Binding Path="OrderData.IsBuy" Converter="{StaticResource BooleanToBooleanInvert}" />            <Binding Path="OrderData.AmountInReference" Converter="{StaticResource BooleanToBooleanInvert}" />        </MultiBinding>    </FrameworkElement.Tag></FrameworkElement><Slider Grid.Row="2" Grid.ColumnSpan="4">    <Slider.Visibility>        <MultiBinding Converter="{StaticResource LogicOrToVisibility}">            <Binding ElementName="IsBuyAndAmountInReference" Path="Tag" />            <Binding ElementName="IsSellAndAmountInBase" Path="Tag" />        </MultiBinding>    </Slider.Visibility></Slider>