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Posted 22 Nov 2010

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

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22 Nov 2010CPOL
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 <window> 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())


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


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Morten Nilsen
Norway Norway
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