DataContext not set for child views at design time.

I’m starting to investigate various design-time problems. I found https://github.com/Caliburn-Micro/Caliburn.Micro/commit/4d2aaf7e2b9a2334ef792a1f6d9f1790c9a02a7a prevents the DataContext from being set.

Sample Wpf project setup: ShellView.xaml (with )

     xmlns:cal="clr-namespace:Caliburn.Micro;assembly=Caliburn.Micro.Platform"
     cal:Bind.AtDesignTime="True"
     d:DataContext="{d:DesignInstance Type=local:ShellViewModel,IsDesignTimeCreatable=True}"

  <StackPanel Background="White">
    <TextBlock x:Name="Text"></TextBlock>
    <ContentControl x:Name="Child"></ContentControl>
  </StackPanel>

ChildView.xaml

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

and the following simple view models:

  public class ShellViewModel : PropertyChangedBase
  {
    public string Text { get; set; } = "Shell Text";
    public ChildViewModel Child { get; set; } = new ChildViewModel();
  }

  public class ChildViewModel : PropertyChangedBase
  {
    public string Text { get; set; } = "Child Text";
  }

The designer for ShellView.xaml incorrectly shows whereas it should match the runtime behavior:

I think the simplest fix is to change the fix from @brendankowitz to

if (e.NewValue == e.OldValue || (Execute.InDesignMode && e.NewValue is string)) {
    return;
}

[nigel-sampson]

Sorry guys, have been living out of a suit case without internet for the last few weeks.

Will take a closer look into this.

[nigel-sampson]

Just pushed that change (thanks @brendankowitz). Hoping to have 3.0.2 out in a few days. Apologies for the delays.