How to set an attached property programmatically eg. Viewport2DVisual3D.IsVisualHostMaterialProperty

attached-properties, c#, dependency-properties, wpf

Solution

It's fairly simple

just give the DiffuseMaterial a name

<Viewport2DVisual3D>
    <Viewport2DVisual3D.Geometry>
        <MeshGeometry3D Positions="0,0,0 0,-30.9274,0 0,-30.9274,-24.4287 0,0,-24.4287"
                        TextureCoordinates="0,0 0,1 1,1 1,0"
                        TriangleIndices="0 1 2 0 2 3" />
    </Viewport2DVisual3D.Geometry>
    <Viewport2DVisual3D.Material>
        <DiffuseMaterial x:Name="diffuse" />
    </Viewport2DVisual3D.Material>

    <Viewport2DVisual3D.Visual>
        <Grid>
            <Image Source="{StaticResource BG}" />
        </Grid>
    </Viewport2DVisual3D.Visual>
</Viewport2DVisual3D>

in code

set it like this

diffuse.SetValue(Viewport2DVisual3D.IsVisualHostMaterialProperty, true);

or

Viewport2DVisual3D.SetIsVisualHostMaterial(diffuse, true);

the property `Viewport2DVisual3D.IsVisualHostMaterialProperty` is an attached property which can be set in the above mentioned ways

Problem

I'd like to know how to programmatically set the WPF Dependecy Property Viewport2DVisual3D.IsVisualHostMaterialProperty . In the xaml I would use: ``` <Viewport2DVisual3D> <Viewport2DVisual3D.Geometry> <MeshGeometry3D Positions = "0,0,0 0,-30.9274,0 0,-30.9274,-24.4287 0,0,-24.4287" TextureCoordinates = "0,0 0,1 1,1 1,0" TriangleIndices = "0 1 2 0 2 3"/> </Viewport2DVisual3D.Geometry> <Viewport2DVisual3D.Material> <DiffuseMaterial Viewport2DVisual3D.IsVisualHostMaterial="True"/> </Viewport2DVisual3D.Material> <Viewport2DVisual3D.Visual> <Grid> <Image Source="{StaticResource BG}"/> </Grid> </Viewport2DVisual3D.Visual> </Viewport2DVisual3D> ``` But how can it be done in code behind?

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