如何将 UIElement 转换为矩形

Question

I have some rectangles stored in Canvas.Children, and when traversing the Canvas.Children, I can use

for (int i=0; i<Canvas.Children.Count; i++)
{
     UIElement ui = Canvas.Children[i];
}

However I don't know how to convert ui into System.Windows.Shapes.Rectangle. Could someone help?

Answer 1

A useful answer can be found in this related question .

Also a useful guide to casting can be found on MSDN here .

Hope this helps.

Answer 2

if(ui is Rectangle)
{
Rectangle rect = (Rectangle)ui;
}

Answer 3

This is based on earlier responses. It might be useful for hit boxes, as in collision=hitBox.IntersectsWith(rectList[rcount]); .

Rect[] rectList;
int rcount = 0; 
for (int i=0;i < CanvasB.Children.Count; i++) {
  UIElement ui = CanvasB.Children[i];
  if (ui is Rectangle) {
    rectList[rcount] = new Rect(
      Canvas.GetLeft(ui), 
      Canvas.GetTop(ui), (double)ui.GetValue(ActualWidthProperty), 
      (double)ui.GetValue(ActualHeightProperty)
    );
    rcount++;
  }
}