Canvas.Left Attached Property

Gets or sets a value that represents the distance between the left side of an element and the left side of its parent Canvas.

Namespace: System.Windows.Controls
Assembly: PresentationFramework (in PresentationFramework.dll)
XML Namespace:

See Canvas.GetLeft, Canvas.SetLeft
See Canvas.GetLeft, Canvas.SetLeft
See Canvas.GetLeft, Canvas.SetLeft
<object Canvas.Left="double" .../>

Property Value

A Double that represents the offset position from the left side of a parent Canvas. The default value is NaN.

Identifier field


Metadata properties set to true


The Left offset of a child element does not affect the size of a parent Canvas.

If you specify them, the attached properties Top or Left take priority over Bottom or Right properties.

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>

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.