UWPのContentDialogのサンプル

ContentDialogSample.cs

//https://social.msdn.microsoft.com/Forums/ja-JP/8a58899a-a324-48db-80c0-e0befddfee52/

public async static Task<string> MessageQuestion(string title, string text, params string[] answers)
{
    StackPanel panel = new StackPanel();

    foreach (var ans in answers)
    {
        RadioButton r = new RadioButton() { Content = ans };
        panel.Children.Add(r);
    }

    TextBox txb = new TextBox() { Text = "てきすとぼっくす" };
    panel.Children.Add(txb);

    Button btn = new Button() { Content = "ぼたん" };
    btn.Click += (s, e) => { txb.Text = "くりっく"; };
    panel.Children.Add(btn);

    ProgressBar pgb = new ProgressBar();
    pgb.Minimum = 0;
    pgb.Maximum = 10;
    pgb.Value = 10;
    panel.Children.Add(pgb);



    ContentDialog dlg = new ContentDialog();
    dlg.Title = title;
    dlg.Content = panel; //Contentに表示させたい内容を設定すればよい
    dlg.PrimaryButtonText = "OK";
    dlg.PrimaryButtonClick += (s, e) =>
    {
        e.Cancel = true;

    };
        

    var tend = DateTime.Now.AddSeconds(10);

    DispatcherTimer timer = new DispatcherTimer();
    timer.Interval = TimeSpan.FromSeconds(0.1);
    timer.Tick += (s, e) =>
    {
        pgb.Value = (tend - DateTime.Now).TotalSeconds;
        if (pgb.Value <= 0)
        {
            dlg.Hide();
        }
    };
    timer.Start();

    var result = await dlg.ShowAsync();
    timer.Stop();
    switch (result)
    {
    case ContentDialogResult.Primary:
        return (string)panel.Children.OfType<RadioButton>().FirstOrDefault(_ => _.IsChecked == true)?.Content;

    case ContentDialogResult.Secondary:
        return txb.Text;

    default:
        return null;
    }
}