c# - wpf c#中GetEnumerator的问题

Question

我想使用以下代码更改视口 3d 中的所有材质颜色：

    DiffuseMaterial mat = new DiffuseMaterial(new SolidColorBrush(Colors.Red));

        foreach (ModelVisual3D model3d in previewport.Children)
        {

            foreach (GeometryModel3D item in model3d.Content)
            {
                item.Material = mat;
            }
        }

但它得到错误：

      Error  
     foreach statement cannot operate on variables of type 'System.Windows.Media.Media3D.Model3D' because 'System.Windows.Media.Media3D.Model3D' does not contain a public definition for 'GetEnumerator'

请帮忙。谢谢。

Answer 1

ModelVisual3D.Content是一个单一的System.Windows.Media.Media3D对象，这就是为什么它抱怨foreach循环。而不是内部循环只是转换Content为GeometryModel3D并更改Material如下：

DiffuseMaterial mat = new DiffuseMaterial(new SolidColorBrush(Colors.Red));

foreach (ModelVisual3D model3d in previewport.Children)
{
    var geometryModel = model3d.Content as GeometryModel3D;
    if (geometryModel != null) geometryModel.Material = mat;
}