https://learn.microsoft.com/en-us/dotnet/api/system.windows.media.animation.objectkeyframecollection.issynchronized?view=windowsdesktop-10.0
ObjectKeyFrameCollection.IsSynchronized Property (System.Windows.Media.Animation) | Microsoft Learn
Gets a value that indicates whether access to this ObjectKeyFrameCollection is synchronized (thread-safe)
property systemwindows mediaanimationmicrosoftlearn
https://learn.microsoft.com/en-us/dotnet/api/system.windows.media.animation.objectkeyframecollection?view=netframework-4.8.1&viewFallbackFrom=windowsdesktop-10.0
ObjectKeyFrameCollection Class (System.Windows.Media.Animation) | Microsoft Learn
Represents a collection of ObjectKeyFrame objects.
class systemwindows mediaanimationmicrosoftlearn