如何以编程方式设置附加属性，例如Viewport2DVisual3D.IsVisualHostMaterialProperty [英] How to set an attached property programmatically eg. Viewport2DVisual3D.IsVisualHostMaterialProperty

问题描述

我想知道如何以编程方式设置WPF Dependecy属性Viewport2DVisual3D.IsVisualHostMaterialProperty.

I'd like to know how to programmatically set the WPF Dependecy Property Viewport2DVisual3D.IsVisualHostMaterialProperty .

在xaml中，我将使用:

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>

但是如何在后面的代码中完成呢?

But how can it be done in code behind?

推荐答案

这很简单

只需给DiffuseMaterial命名

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>

用代码

像这样设置

diffuse.SetValue(Viewport2DVisual3D.IsVisualHostMaterialProperty, true);

或

Viewport2DVisual3D.SetIsVisualHostMaterial(diffuse, true);

Viewport2DVisual3D.IsVisualHostMaterialProperty 属性是可以通过上述方式设置的附加属性

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

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