C#UWP – 如何从另一个页面访问页面控件？

有没有办法从另一个页面访问页面控件.我在MainPage中有一些控件,我想从另一个包含列表视图的页面访问Mainpage Controls TitleTextBlock.我想在选择listview项时更改主页TitleTextBlock.Text.

我也尝试但TitleTextBlock.Text值不会改变.那有什么办法吗？

MainPage.xaml.cs中

public void ChangeTitle(string title)
{
   TitleTextBlock.Text = title;
   BackButton.Visibility = Visibility.Visible;
}

ContentPage.xaml.cs

private void ListView_ItemClick(object sender,ItemClickEventArgs e)
{
   var link = (Link)e.ClickedItem;
   this.Frame.Navigate(typeof(WebViewPage),link);

   MainPage p = new MainPage();
   p.ChangeTitle(link.Title);
}

更新
我解决了这个问题,几乎没有变化
MainPage.xaml.cs中

public static TextBlock HeaderTitleTextBlock { get; set; }
 public static Button HeaderBackButton { get; set; }

 public MainPage()
   {
      this.InitializeComponent();
      HeaderTitleTextBlock = TitleTextBlock;
      HeaderBackButton = BackButton;

   }

ContentPage.xaml.cs

MainPage.HeaderTitleTextBlock.Text = link.Title;
MainPage.HeaderBackButton.Visibility = Visibility.Visible;

<TextBlock x:FieldModifier="public" x:Name="MyTextBlock" />