Xamarin StackLayout

Question

我正在尝试学习Xamarin App开发的基础知识，当我在手机上运行此代码时，它并没有向我显示任何标签

public partial class MainPage : ContentPage
{
    public MainPage()
    {
        Color[] colors = { Color.White, Color.Silver, Color.Gray, Color.Blue, Color.Red, Color.DarkBlue, Color.Black, Color.Yellow, Color.Green, Color.OrangeRed, Color.Orange };
        string[] colorNames = { "White", "Silver", "Gray", "Blue", "Red", "DarkBlue", "Black", "Yellow", "Green", "OrangeRed", "Orange" };
        StackLayout stackLayout = new StackLayout();
        int i;
        for (i = 0; i < colors.Length; i++)
        {
            Label label = new Label
            {
                Text = colorNames[i],
                TextColor = colors[i],
                FontSize=Device.GetNamedSize(NamedSize.Large,typeof(Label))
            };
            stackLayout.Children.Add(label);
        }
        this.Content = stackLayout;
    }
}

有人能解释我为什么吗？