How to access MainPage.xaml controls from another page

Question

i have an image element in the MainPage.xaml and a flyout in SettingsContract1.xaml, when the flyout item is clicked the filepicker is opened and i want to set them image source of the image in the Mainpage with the file picked from the filepicker. How can i access the image from SettingsContract1.xaml

image in MainPage.xaml

<Image x:Name="img" HorizontalAlignment="Left" Height="332" VerticalAlignment="Top" Width="778" Margin="349,406,0,0"/>

menuflyout sub in SettingsContract1.xaml.vb

Private Sub chooseFile_Click(sender As Object, e As RoutedEventArgs) Handles chooseFile.Click
    Dim filePicker As FileOpenPicker
    filePicker = New FileOpenPicker()
    filePicker.ViewMode = PickerViewMode.Thumbnail
    filePicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary
    filePicker.FileTypeFilter.Add(".png")
    Dim file As StorageFile = Await filePicker.PickSingleFileAsync()

    Using filestream As Streams.IRandomAccessStream = Await file.OpenAsync(FileAccessMode.Read)
        Dim bitmapImage As Windows.UI.Xaml.Media.Imaging.BitmapImage = New BitmapImage
        bitmapImage.SetSource(filestream)
        img.Source = bitmapImage 'gives an error
    End Using

End Sub

Answer 1

Found the answer from stackoverflow

Private Async Sub chooseFile_Click(sender As Object, e As RoutedEventArgs) Handles chooseFile.Click
    Dim mapImage As Frame = Window.Current.Content
    Dim mainPage As MainPage = mapImage.Content
    Dim filePicker As FileOpenPicker
    filePicker = New FileOpenPicker()
    filePicker.ViewMode = PickerViewMode.Thumbnail
    filePicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary
    filePicker.FileTypeFilter.Add(".png")
    Dim file As StorageFile = Await filePicker.PickSingleFileAsync()

    Using filestream As Streams.IRandomAccessStream = Await file.OpenAsync(FileAccessMode.Read)
        Dim bitmapImage As Windows.UI.Xaml.Media.Imaging.BitmapImage = New BitmapImage
        bitmapImage.SetSource(filestream)
        mainPage.img.Source = bitmapImage
    End Using

End Sub

Answer 2

Nice to see that and thanks for sharing.

--James

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