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How to hook up a ViewModel to a window using an attached property

, 22 Nov 2010 CPOL
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I also have implemented a MarkupExtension to set the DataContext, which looks like this:[MarkupExtensionReturnType(typeof(ApplicationControllerBase))]public class ApplicationDataContext : MarkupExtension{ private Type dataContextType; public ApplicationDataContext(Type...
I also have implemented a MarkupExtension to set the DataContext, which looks like this:
public class ApplicationDataContext : MarkupExtension
	private Type dataContextType;
	public ApplicationDataContext(Type dataContextType)
		this.dataContextType = dataContextType;
	public ApplicationDataContext()
		: this(null)
	public override object ProvideValue(IServiceProvider serviceProvider)
		return ApplicationControllerBase.GetController(dataContextType);
The usage of this is quite simply;
<Grid DataContext="{vm:ApplicationDataContext app:...}">
If you set the DataContext on an an element inside rather than directly on Window, you will get your ViewModel object instanciated design-time.
When doing this, you should avoid service or database calls, as they will likely throw configurationexceptions.
You can detect the designer i code using this statement:
if(DesignerProperties.GetIsInDesignMode(new System.Windows.DependencyObject())


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Morten Nilsen

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