I want to use Visbility in other project to do some operate,

 

but I purely write "Visibility, Visual Stuido can't find the reference,

so is add "System.Windows" and write "System.Windows.Visbility"

and add "System.Windows" and write "System.Windows.UIElement.Visbility" all not work,

 

Finally I add reference "PresentationCore" and write "Visibility" works

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