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Embedding content inside a UserControl from its parent control in Silverlight 4

, 6 Oct 2010
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This trick explains how you can allow to embed Content for a UserControl when consumed by another control by making use of the ContentProperty
Whenever you create your own UserControl in Silverlight it bothered me that, when consuming the usercontrol in a parent control (e.g. the page), it is not allowed to access the user control's content.
e.g. assume the following code as part of a consumer control:
 
<Grid x:Name="LayoutRoot">
  <MyApp:MyUserControl>
    <TextBlock Text="This is consumer defined content!"></TextBlock>
  </MyApp:MyUserControl>
</Grid>
You get the following error: "The property 'Content' does not exist on the type....".
 
The problem is that the Content property is a private property of the UserControl.
However there is a workaround for this problem: the ContentProperty attribute.
 
Here are the steps to follow:
1. in your UserControl.xaml add a ContentPresenter control that will hold the user defined content. Name the ContentPresenter 'contentPresenter'.
2. in your UserControl codebehind define a new property:
        public object UserContent
        {
            get { return contentPresenter.Content; }
            set { contentPresenter.Content = value; }
        }
3. Now for the trick: add the following attribute to the class:
[ContentProperty("UserContent")]



There that's it. You can now create your layout witin the UserControl xaml and embed the actual user content at any position within your user control.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Herre Kuijpers
Architect Capgemini
Netherlands Netherlands
Currently Herre Kuijpers is employed at Capgemini Netherlands for over 10 years, where he developed skills with all kinds of technologies, methodologies and programming languages such as c#, ASP.Net, Silverlight, VC++, Javascript, SQL, UML, RUP, WCF. Currently he fulfills the role of software architect in various projects.
 
Herre Kuijpers is a very experienced software architect with deep knowledge of software design and development on the Microsoft .Net platform. He has a broad knowledge of Microsoft products and knows how these, in combination with custom software, can be optimally implemented in the often complex environment of the customer.

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QuestionThanks PinmemberPhylum12325-May-12 3:35 

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