Add Content to UserControl

Question

I have a UserControl named myControl and there is a 3 columns Grid within it.

<Grid Name="main"> <Grid Grid.Column="0"/><Grid Grid.Column="1"/><Grid Grid.Column="2"/> </Grid>

The client can use it in this way and it is ok.

<myControl />

My problem is, the client want to add an Element into the first column of "main" Grid, like:

<myControl> <TextBlock Text="abc"/> </myControl>

In this case, the TextBlock will replace the originated Content, here it is the "main" Grid.

What should I do to support the additional element? Great thanks.

decyclone · Accepted Answer · 2012-05-26 15:29:03Z

You can use something like following:

// This allows "UserContent" property to be set when no property is specified // Example: <UserControl1><TextBlock>Some Text</TextBlock></UserControl1> // TextBlock goes into "UserContent" [ContentProperty("UserContent")] public partial class UserControl1 : UserControl { // Stores default content private Object defaultContent; // Used to store content supplied by user private Object _userContent; public Object UserContent { get { return _userContent; } set { _userContent = value; UpdateUserContent(); } } private void UpdateUserContent() { // If defaultContent is not set, backup the default content into it // (will be set the very first time this method is called) if (defaultContent == null) { defaultContent = Content; } // If there is something in UserContent, set it to Content if (UserContent != null) { Content = UserContent; } else // Otherwise load default content back { Content = defaultContent; } } public UserControl1() { InitializeComponent(); } }

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