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)
XMLNS for XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation

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

Property Value

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

Identifier field

LeftProperty

Metadata properties set to true

None

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

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

WindowTitle = "Attached Properties Sample" 
' Add a Border 
Dim myBorder As New Border()
myBorder.HorizontalAlignment = Windows.HorizontalAlignment.Left
myBorder.VerticalAlignment = Windows.VerticalAlignment.Top
myBorder.BorderBrush = Brushes.Black
myBorder.BorderThickness = New Thickness(2)

' Create a Canvas as the root Panel 
Dim myCanvas As New Canvas()
myCanvas.Background = Brushes.LightBlue
myCanvas.Width = 400
myCanvas.Height = 400

' Create the child Button elements 
Dim myButton1 As New Button()
Dim myButton2 As New Button()
Dim myButton3 As New Button()
Dim myButton4 As 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
myCanvas.Children.Add(myButton1)
myCanvas.Children.Add(myButton2)
myCanvas.Children.Add(myButton3)
myCanvas.Children.Add(myButton4)

' Add the Canvas as the lone Child of the Border
myBorder.Child = myCanvas
Me.Content = myBorder
<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 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>
    </Canvas>
  </Border>    
</Page>

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0
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