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UIElement.RenderSize Property

Gets (or sets, but see Remarks) the final render size of this element.

Namespace:  System.Windows
Assembly:  PresentationCore (in PresentationCore.dll)
XMLNS for XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation

public Size RenderSize { get; set; }

Property Value

Type: System.Windows.Size
The rendered size for this element.

Important noteImportant Note:

Do not attempt to set this property, either in XAML or in code, if using the WPF framework-level layout system. Nearly all typical application scenarios will use this layout system. The layout system will not respect sizes set in the RenderSize property directly. The RenderSize property is declared writable only to enable certain WPF core-level bridging cases that deliberately circumvent the typical layout protocols, such as support for the Adorner class.

This property can be used for checking the applicable render size within layout system overrides such as OnRender or GetLayoutClip.

A more common scenario is handling the SizeChanged event with the class handler override or the OnRenderSizeChanged event.

The following example shows how a custom adorner uses the RenderSize value in order to create and size the rectangle graphic that defines the adorner, as part of its OnRender implementation.

protected override void OnRender(DrawingContext drawingContext)
{
  // Get a rectangle that represents the desired size of the rendered element 
  // after the rendering pass.  This will be used to draw at the corners of the  
  // adorned element.
  Rect adornedElementRect = new Rect(this.AdornedElement.RenderSize);

  // Some arbitrary drawing implements.
  SolidColorBrush renderBrush = new SolidColorBrush(Colors.Green);
  renderBrush.Opacity = 0.2;
  Pen renderPen = new Pen(new SolidColorBrush(Colors.Navy), 1.5);
  double renderRadius = 5.0;

  // Just draw a circle at each corner.
  drawingContext.DrawEllipse(renderBrush, renderPen, adornedElementRect.TopLeft, renderRadius, renderRadius);
  drawingContext.DrawEllipse(renderBrush, renderPen, adornedElementRect.TopRight, renderRadius, renderRadius);
  drawingContext.DrawEllipse(renderBrush, renderPen, adornedElementRect.BottomLeft, renderRadius, renderRadius);
  drawingContext.DrawEllipse(renderBrush, renderPen, adornedElementRect.BottomRight, renderRadius, renderRadius);
}

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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