https://learn.microsoft.com/fr-fr/dotnet/api/system.windows.data.collectionviewsource.collectionviewtypeproperty?view=netframework-4.8.1&viewFallbackFrom=windowsdesktop-8.0
CollectionViewSource.CollectionViewTypeProperty Field (System.Windows.Data) | Microsoft Learn
Identifies the CollectionViewType dependency property.
field systemwindowsdatamicrosoftlearn