https://learn.microsoft.com/zh-tw/dotnet/api/system.windows.media.animation.clockgroup.-ctor?view=netframework-4.7.1
ClockGroup(TimelineGroup) Constructor (System.Windows.Media.Animation) | Microsoft Learn
Instantiates a new instance of the ClockGroup class.
windows mediaconstructorsystemanimationmicrosoft
https://learn.microsoft.com/ja-jp/dotnet/api/system.windows.media.animation.timelinegroup?view=windowsdesktop-10.0
TimelineGroup Class (System.Windows.Media.Animation) | Microsoft Learn
Abstract class that, when implemented represents a Timeline that may contain a collection of child Timeline objects.
class systemwindows mediaanimationmicrosoftlearn