MediaElement.NaturalDuration Property
.NET Framework 4
Gets the natural duration of the media.
Assembly: PresentationFramework (in PresentationFramework.dll)
The value returned is independent of SpeedRatio.
NaturalDuration is not accurate until the MediaOpened event has been raised.
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.