Get Sound File Length in c#

I am trying to get the length of a sound file using this code:

MediaElement mysound = new MediaElement();
mysound.Source = new Uri(@"D:\majed\Phone\PhoneProject\PhoneProject\Sound\ring1.wav",UriKind.RelativeOrAbsolute);
double length = mysound.NaturalDuration.TimeSpan.Seconds;

but I receive an exception that says "mysound.NaturalDuration.TimeSpan.Seconds is null"

What can I do?

Note : I do not want using ( play ) or ( open ) method开发者_开发问答 .

Thank you all

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Yes indeed NaturalDuration will not be valid till Media is opened : http://msdn.microsoft.com/en-us/library/system.windows.controls.mediaelement.naturalduration.aspx
I see no way to do this otherwise.

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According to MSDN,

NaturalDuration is not accurate until the MediaOpened event has been raised.

MediaElement inherits from System.Windows.UIElement and is in the Systems.Windows.Controls namespace. By convention, it makes sense that a media player doesn't know certain media details of a file until the file is opened. If what you're after is just the length of a song file, perhaps you can check this out. Granted, it applies to MP3 files, but perhaps it can get you in the right direction.