Storyboard.Pause Method (FrameworkElement)
Assembly: PresentationFramework (in PresentationFramework.dll)
This method pauses the storyboard, but has no discernible effect if it is not active or currently paused. As a side effect, all associated children are also paused.
Seeking a paused storyboard does not resume it. The only way to resume a paused storyboard is to use the Resume method. Calling the Begin method again replaces the paused storyboard with a new one, which has the appearance of resuming it.
To interactively control this storyboard, you must use the same containingObject parameter when calling the interactive methods that you used to begin the storyboard. A controllable storyboard can pause, resume, seek, stop, and be removed. To make a storyboard controllable in code, you must use the appropriate overload of the storyboard's Begin method and specify true to make it controllable. For an example, see How to: Control a Storyboard After It Starts.
Pausing a storyboard's clock triggers the CurrentGlobalSpeedInvalidated event.
Beginning a Paused Storyboard
When you Begin a storyboard that was paused, it appears to resume and restart. However, that is not what actually happens. The Begin method actually replaces itself with an unpaused version. Each time the Begin method is called, clock objects are created for the storyboard. These clocks are distributed to the properties they animate. So, when the Begin method is called again, it does not restart its clocks; it replaces them with new clocks.