WINDOWS10UWP: How do I set the control to public in XAML?

In WINDOWS10UWP, because of the use of page navigation, the control requirements for operations on different pages are often encountered.

If you want to manipulate a control inside another page, the control must be set to public. The method for setting the control in XAML is:

<textblock horizontalalignment= "left" margin= "219,260,0,0" textwrapping= "Wrap" text= "TextBlock" Verticalalignment= "Top" x:fieldmodifier= "public"/>

　　

is x:fieldmodifier= "public". Details can be viewed: https://msdn.microsoft.com/zh-cn/library/aa970905 (v=vs.110). aspx

WINDOWS10UWP: How do I set the control to public in XAML?