MultiBinding cannot be applied to a Transform

[SuperJMN]

Maybe they can it only be applied to FrameworkElements.

EDIT: I have just discovered that I can be applied to a MultiBinding only just change the Type Parameter of its declaration to Behavior<DependencyObject>
EDIT 2: Unfortunately, it seems that the MultiBindingBehavior still doesn't work with a Transform. All the values in the Converter come with null instead the real value.

Bit thanks in advance, Pedro!

[pedrolamas]

Can you post a sample code so I can try to help?

In any case, are you targetting UWP only? If so, I recommend using x:bind with a function instead as that is quite better nowadays!

[SuperJMN]

Hey Pedro. Thanks for your quick response as always! Yes, I'm targeting UWP. This is the code I'm using right now:

 <Border Background="Black">
                    <Border.RenderTransform>
                        <TranslateTransform>
                            <i:Interaction.Behaviors>
                                <b:MultiBindingBehavior Converter="{StaticResource PolarToCartesianCoordsConverter}"
                                                                PropertyName="X" ConverterParameter="X">
                                    <b:MultiBindingItem Value="{Binding ShadowAngle}" />
                                    <b:MultiBindingItem Value="{Binding ShadowDistance}" />
                                </b:MultiBindingBehavior>
                                <b:MultiBindingBehavior Converter="{StaticResource PolarToCartesianCoordsConverter}"
                                                        PropertyName="X" ConverterParameter="Y">
                                    <b:MultiBindingItem Value="{Binding ShadowAngle}" />
                                    <b:MultiBindingItem Value="{Binding ShadowDistance}" />
                                </b:MultiBindingBehavior>
                            </i:Interaction.Behaviors>
                        </TranslateTransform>
                    </Border.RenderTransform>
                </Border>

Basically, my model has polar coordinates and I want to transform them to cartesian coordinates in order to project a "border" that will simulate a shadow. So, I'm getting angle and distance.

I hope you can check it :) In the meanwhile, I'm trying to do it with x:Bind. I have never been a friend of x:Bind because the many restrictions it has, but it may help in this concrete case.

Big thanks in advance!