麻煩的GetEnumerator在WPF C＃

Question

我想改變這一切材料顏色使用此代碼視圖口3D：

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

     foreach (ModelVisual3D model3d in previewport.Children) 
     { 

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

但得到的錯誤：

 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' 

請幫助。 謝謝。

Answer 1

ModelVisual3D.Content是一個單一的System.Windows.Media.Media3D對象，這就是爲什麼它抱怨foreach循環。相反，內環只投Content爲GeometryModel3D並改變其Material象下面這樣：

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; 
}