如何在WPF中从弹出对话框窗口导航到另一个页面我未使用MVVM

Question

I want to navigate to another page when a user selects an option from a WPF dialog window. From page1, I pop up the window with this code via a button click event

private void newCust_Click(object sender, RoutedEventArgs e)
    {
        bvnQuery bv = new bvnQuery();
        bool? val = bv.ShowDialog();

        if (val.HasValue && val.Value)
        {
            NavigationService.Navigate("page3.xaml", UriKind.Relative);
        }
    }

then on the dialog window, I selected a Yes/No option(button), when I returned the value to the calling function, I get a blank page when I navigate to the page in the URI above. How do I work around this?

Answer 1

You should set the DialogResult property of your bvnQuery window in your "Yes/No" handler:

private void Button_Click(object sender, RoutedEventArgs e)
{
    this.DialogResult = true;
}

This value will be returned from the ShowDialog() method:

private void Button_Click(object sender, RoutedEventArgs e)
{
    bvnQuery bv = new bvnQuery();
    bool? val = bv.ShowDialog();

    if (val.HasValue && val.Value)
    {
        //...
    }
}