How to hook up a ViewModel to a window using an attached property
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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:
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:
[MarkupExtensionReturnType(typeof(ApplicationControllerBase))]
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:...}">
...
</Grid>
If you set the DataContext on an an element inside if(DesignerProperties.GetIsInDesignMode(new System.Windows.DependencyObject())
{
...
}