How to: Use the Attached Properties of Canvas to Position Child Elements

This example shows how to use the attached properties of Canvas to position child elements.


The following example adds four Button elements as child elements of a parent Canvas. Each child element represents a distinct attached property of Canvas: Bottom, Left, Right, and Top. Each Button is positioned relative to the parent Canvas and according to its assigned property value.

// Create the application's main window
mainWindow = new Window ();
mainWindow.Title = "Canvas Attached Properties Sample";

// Add a Border
Border myBorder = new Border();
myBorder.HorizontalAlignment = HorizontalAlignment.Left;
myBorder.VerticalAlignment = VerticalAlignment.Top;
myBorder.BorderBrush = Brushes.Black;
myBorder.BorderThickness = new Thickness(2);

// Create the Canvas
Canvas myCanvas = new Canvas();
myCanvas.Background = Brushes.LightBlue;
myCanvas.Width = 400;
myCanvas.Height = 400;

// Create the child Button elements
Button myButton1 = new Button();
Button myButton2 = new Button();
Button myButton3 = new Button();
Button myButton4 = new Button();

// Set Positioning attached properties on Button elements
Canvas.SetTop(myButton1, 50);
myButton1.Content = "Canvas.Top=50";
Canvas.SetBottom(myButton2, 50);
myButton2.Content = "Canvas.Bottom=50";
Canvas.SetLeft(myButton3, 50);
myButton3.Content = "Canvas.Left=50";
Canvas.SetRight(myButton4, 50);
myButton4.Content = "Canvas.Right=50";

// Add Buttons to the Canvas' Children collection

// Add the Canvas as the lone Child of the Border
myBorder.Child = myCanvas;

// Add the Border as the Content of the Parent Window Object
mainWindow.Content = myBorder;
mainWindow.Show ();

<Page xmlns="" WindowTitle="Canvas Attached Properties Sample">
  <Border HorizontalAlignment="Left" VerticalAlignment="Top" BorderBrush="Black" BorderThickness="2">
    <Canvas Background="LightBlue" Width="400" Height="400">
      <Button Canvas.Top="50">Canvas.Top="50"</Button>
      <Button Canvas.Bottom="50">Canvas.Bottom="50"</Button>
      <Button Canvas.Left="50">Canvas.Left="50"</Button>
      <Button Canvas.Right="50">Canvas.Right="50"</Button>

See Also