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Grid rootGrid = new Grid();
private void Application_Startup(object sender, StartupEventArgs e)
{
this.RootVisual = rootGrid;
rootGrid.Children.Add(new MainPage());
}
public static void RedirectTo(UserControl usercontrol)
{
App app = (App)Application.Current;
app.rootGrid.Children.Clear();
app.rootGrid.Children.Add(usercontrol);
}
App.RedirectTo(new ViewData()); //ViewData是页面的名字