c# - UWP check the current page for name or instance -

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in uwp app launching protocol or toast. in onactivated method want check whether apps' mainview open or page showing. app.xaml.cs

i wanna like:

if mainpage not showing --> navigate(typeof(mainpage));

or

if main window not open since coming protocol or toast launch open frame , navigate mainpage.

not sure how go it.

so i'm checking for

var frame = window.current.content frame;  if (frame != null) {     type whatpageisit = frame.sourcepagetype;     // handle page type } else {     // need in case window not open }

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