How to get the theme ID inside a vs.net extension without using references to vsnet2012 dlls (so code can be added to 2010 vsix too)

howtogetvsnetthemeid.cs

var themeService = this.ActiveServiceProvider.GetService(new Guid("0D915B59-2ED7-472A-9DE8-9161737EA1C5"));
if(themeService == null)
{
	// no theming, no problem!
	return;
}
var currentThemeProperty = themeService.GetType().GetProperty("CurrentTheme");
if(currentThemeProperty == null)
{
	// something's wrong. No theming for you
	return;
}
var currentTheme = currentThemeProperty.GetValue(themeService, null);
if(currentTheme == null)
{
	// user has no theme. We can't help further
	return;
}
var themeIdProperty = currentTheme.GetType().GetProperty("ThemeId");
if(themeIdProperty == null)
{
	return;
}
var themeIdGuid = themeIdProperty.GetValue(currentTheme, null);
if(themeIdGuid == null)
{
	return;
}

// use id here. IDs of common themes:
//Blue: {a4d6a176-b948-4b29-8c66-53c97a1ed7d0}
//Dark: {1ded0138-47ce-435e-84ef-9ec1f439b749}
//Light: {de3dbbcd-f642-433c-8353-8f1df4370aba}

Thanks for documenting this stuff! Is ActiveServiceProvider your own wrapper to look up services via Guid? Not something I've seen else where, but looks handy! Struggling with VS being able to use anything in the Microsoft.Internal.VisualStudio.Shell.Interop namespace. Can see which DLL to get the type from but still complains missing reference (eg IVsColorThemeService), ActiveServiceProvider + reflection looks like a good way to get around the issue.