Canceling Navigation
The OnNavigatingFrom method offers the opportunity to cancel navigation using the NavigatingCancelEventArgs parameter.
NavigatingCancelEventArgs has the following properties:
NavigationMode—An enum value that indicates the type of navigation. This value may be Back, Forward, New, or Refresh.
Uri—The destination URI.
Cancel—Setting this value to true cancels the navigation.
The NavigationCancelEventArgs class subclasses CancelEventArgs ...
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