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Why are there two formats to the WpfToolkit namespace? When should I use each?

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Hi, when restyling the Wpf Toolkit Datagrid I discovered that Expreesion Blend uses a Wpf Toolkit namespace in the [first] format:

xmlns:Custom="http://schemas.microsoft.com/wpf/2008/toolkit"

I've always used the namespace [second format]:

xmlns:WpfToolkit="clr-namespace:Microsoft.Windows.Controls;assembly=WpfToolkit"

They are different since substituting the second format into the Expression Blend restyling resulted in unknown tags, among other things.

Why are there two namespace formats? Is there a penalty for using the first format? Should I ever use the second format?

Thnaks, Graeme
Monday, February 28, 2011 12:22 AM

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Well, they are slightly different.

The frst example you provided allows for a namespace declaration to map to multiple CLR namespaces. For example, System.Windows and System.Windows.Controls maps to the http://schemas.microsoft.com/winfx/2006/xaml/presentation namespace, allowing you to reference any controls from either mapped CLR namespace from a single declaration.

The second example is a fully qualified namespace declaration. It only maps to a single CLR namespace and you will only have access to controls in that single CLR namespace.

For more information on namespaces please visit this link: http://msdn.microsoft.com/en-us/library/ms747086.aspx
- Marked as answer by GRichardson Monday, February 28, 2011 5:53 AM
Monday, February 28, 2011 4:37 AM