'宣言 Public Shared ReadOnly ViewportOriginProperty As Windows.UI.Xaml.DependencyProperty
public static readonly Windows.UI.Xaml.DependencyProperty ViewportOriginProperty
'宣言 Public Shared ReadOnly ViewportOriginProperty As Windows.UI.Xaml.DependencyProperty
public static readonly Windows.UI.Xaml.DependencyProperty ViewportOriginProperty