xaml design-time data

[Matt Oswald]

I expected that putting this in my View's constructor

if (ModeDetector.InDesignMode())

{

   City.Text = "Austin";

}

would display "Austin" in either Blend or the Visual Studio design window. ...Why doesn't it?

--m

[Paul Betts]

Hey Matt,

Design-time Mode is a Magical Mystical place, where certain code runs and certain code doesn't; it's completely undocumented. Where you put that code will decide whether it runs.

However, in RxUI if you're using ReactiveUI bindings, there's a far simpler way to do design-time data than what Microsoft recommends. It's going to sound crazy and feel Weird, but humor me. 

<!-- Just write the sample data in -->

<TextBlock x:Name="City" Text="Austin" />

this.OneWayBind(ViewModel, vm => vm.City, v => v.City.Text);

You can just type in the sample data directly. No magic data. No creating bizarre fakes in Xaml. 

It even works for ItemsControls, because if a control has both Items and ItemsSource, the latter trumps the former. So, basically all you do is drag-drop instances of your UserControls onto the ListBox and you'll end up with this:

<ListBox x:Name="MyList">

<ListBox.Items>

<!-- Because you've done the same sample data for this control too, you'll see

     the listbox populated with data -->

<ctl:MyListItemUserControl />

<ctl:MyListItemUserControl />

<ctl:MyListItemUserControl />

</ListBox.Items>

</ListBox>

// ItemsSource trumps Items, so none of the dummy user controls will show

this.OneWayBind(ViewModel, vm => vm.Items, v => v.MyList.ItemsSource);

Paul

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