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title, ms.date, dev_langs, helpviewer_keywords, ms.assetid
| title | ms.date | dev_langs | helpviewer_keywords | ms.assetid | |||
|---|---|---|---|---|---|---|---|
| How to: Implement an Adorner | 03/30/2017 |
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56ae32b6-0599-455c-b52f-2ff97e6f1ec2 |
How to: Implement an Adorner
This example shows a minimal adorner implementation.
Notes for Implementers
It is important to note that adorners do not include any inherent rendering behavior; ensuring that an adorner renders is the responsibility of the adorner implementer. A common way of implementing rendering behavior is to override the xref:System.Windows.UIElement.OnRender%2A method and use one or more xref:System.Windows.Media.DrawingContext objects to render the adorner's visuals as needed (as shown in this example).
Example
Description
A custom adorner is created by implementing a class that inherits from the abstract xref:System.Windows.Documents.Adorner class. The example adorner simply adorns the corners of a xref:System.Windows.UIElement with circles by overriding the xref:System.Windows.UIElement.OnRender%2A method.
Code
[!code-csharpAdorners_SimpleCircleAdorner#_SimpleCircleAdornerBody] [!code-vbAdorners_SimpleCircleAdorner#_SimpleCircleAdornerBody]