HOW TO：列舉 Visual 的繪圖內容

更新：2007 年 11 月

Drawing 物件提供列舉 Visual 內容的物件模型。

範例

下列範例使用 GetDrawing 方法，擷取 Visual 的 DrawingGroup 值並加以列舉。

注意事項：
當您列舉視覺內容時，您會擷取 Drawing 物件，而不是擷取轉譯資料的基礎表示做為向量圖形指示清單。如需詳細資訊，請參閱 Windows Presentation Foundation 圖形轉譯概觀。

public void RetrieveDrawing(Visual v)
{
    DrawingGroup dGroup = VisualTreeHelper.GetDrawing(v);
    EnumDrawingGroup(dGroup);

}

 // Enumerate the drawings in the DrawingGroup.
 public void EnumDrawingGroup(DrawingGroup drawingGroup)
 {
     DrawingCollection dc = drawingGroup.Children;

     // Enumerate the drawings in the DrawingCollection.
     foreach (Drawing drawing in dc)
     {
         // If the drawing is a DrawingGroup, call the function recursively.
         if (drawing.GetType() == typeof(DrawingGroup))
         {
             EnumDrawingGroup((DrawingGroup)drawing);
         }
         else if (drawing.GetType() == typeof(GeometryDrawing))
         {
             // Perform action based on drawing type.  
         }
         else if (drawing.GetType() == typeof(ImageDrawing))
         {
             // Perform action based on drawing type.
         }
         else if (drawing.GetType() == typeof(GlyphRunDrawing))
         {
             // Perform action based on drawing type.
         }
         else if (drawing.GetType() == typeof(VideoDrawing))
         {
             // Perform action based on drawing type.
         }
     }
 }

請參閱

概念

繪圖物件概觀

Windows Presentation Foundation 圖形轉譯概觀

參考

Drawing

DrawingGroup

VisualTreeHelper