How to cast UIElement to Rectangle

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?

Rectangle rect = Canvas.Children[i] as Rectangle; – Luis Filipe Feb 17 '14 at 11:27 — Luis Filipe, Feb 17 '14 at 11:27
I'd advise you to learn about casting in c# – Luis Filipe Feb 17 '14 at 11:28 — Luis Filipe, Feb 17 '14 at 11:28
@LuisFilipe, thank you! I'm a newcomer to C# – C. Wang Feb 17 '14 at 11:29 — C. Wang, Feb 17 '14 at 11:29

score 0 · Answer 1 · edited May 23 '17 at 11:49

0

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.

edited May 23 '17 at 11:49

Community

1
1

answered Feb 17 '14 at 11:31

Rob Aston

816
12
19

score 0 · Answer 2 · answered Feb 17 '14 at 11:34

0

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

answered Feb 17 '14 at 11:34

Valentin Kuzub

11,703
7
56
93

score 0 · Answer 3 · edited May 10 '20 at 02:03

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++;
  }
}

How to cast UIElement to Rectangle

3 Answers3