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

Question

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

在 xaml 中，我会使用:

<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？

Answer 1

这很简单

只需为 DiffuseMaterial 命名

<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>

在代码中

设置成这样

diffuse.SetValue(Viewport2DVisual3D.IsVisualHostMaterialProperty, true);

或者

Viewport2DVisual3D.SetIsVisualHostMaterial(diffuse, true);

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