c# – 如何以编程方式设置附加属性,例如. Viewport2DVisual3D.IsVisualHostMaterialProperty

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

在xaml我会使用：

<Viewport2DVisual3D>
    <Viewport2DVisual3D.Geometry>
        <MeshGeometry3D Positions = "0,0 0,-30.9274,-24.4287 0,-24.4287"
                        TextureCoordinates = "0,1 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>

但是如何在代码背后完成呢？

解决方法

这很简单

只需为DiffuseMaterial命名即可

<Viewport2DVisual3D>
    <Viewport2DVisual3D.Geometry>
        <MeshGeometry3D Positions="0,-24.4287"
                        TextureCoordinates="0,0"
                        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>

在代码中

像这样设置它

diffuse.SetValue(Viewport2DVisual3D.IsVisualHostMaterialProperty,true);

要么

Viewport2DVisual3D.SetIsVisualHostMaterial(diffuse,true);

属性Viewport2DVisual3D.IsVisualHostMaterialProperty是一个附加属性,可以用上面提到的方式设置