protected override void OnNavigatingFrom(NavigatingCancelEventArgs e)
{
ProductTypeManagerViewModel productTypeManagerViewModel = this.DataContext as ProductTypeManagerViewModel;
productTypeManagerViewModel.ConfirmLeave();
}
// 当用户导航到此页面时执行。
protected override void OnNavigatedTo(NavigationEventArgs e)
{
ProductTypeManagerViewModel productTypeManagerViewModel = this.DataContext as ProductTypeManagerViewModel;
productTypeManagerViewModel.LoadData();
}