c# - Windows 8 App - Pass Data to MainPage -

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i want pass data child page of mainpage in app. problem, can tell there splash loading screen navigates mainpage , want write "if navigated child page" block include in onnavigatedto.

here mainpage.xaml.cs code:

    protected override void onnavigatedto(navigationeventargs args)     {         if (base.onnavigatedfrom(args) = childpage)         {         //    code for: if navigated child page             returndata returndata = args.parameter returndata;             this.mynewstring = returndata.mystring;         }         base.onnavigatedto(args);     }

i found out cannot return data way used passing data page windows 8 apps. cannot return data way pass i.e. this.frame.navigate(typeof(mainpage), passdata);

for solution, created 'completed' event , and called mainpage c# code behind.

mainpage.xaml.cs:

    protected override void onnavigatedfrom(navigationeventargs args)     {         if (args.sourcepagetype.equals(typeof(childpage)))             (args.content childpage).completed += onchildpagecompleted;         base.onnavigatedfrom(args);     }      void onchildpagecompleted(object sender, returndata args)     {         // code run if returned mainpage childpage         this.mynewstring = returndata.mystring;         (sender childpage).completed -= onchildpagecompleted;     }

returndata.cs:

namespace mytestapp {     class returndata     {         public string mystring { set; get; }     } }

childpage.xaml.cs:

public event eventhandler<returndata> completed;

childpage.xaml.cs:

protected override void onnavigatedfrom(navigationeventargs args) {     if (completed != null)     {          // create returndata object         returndata returndata = new returndata();          returndata.mystring = newstringchanged;          // fire completed event         completed(this, returndata);     }      base.onnavigatedfrom(args); }

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