C# 椭圆不出现

当我试图得到一个椭圆，它不会显示。我设置颜色、大小和位置

这是我目前的代码：

public static Ellipse MainSnake = new Ellipse();

private void button_Click(object sender, RoutedEventArgs e)
{
    button.Visibility = Visibility.Hidden;

    MainSnake.Height = 10;
    MainSnake.Width = 10;
    MainSnake.Fill = Brushes.Yellow;
    Canvas.SetLeft(MainSnake, 250);
    Canvas.SetTop(MainSnake, 150);
}

当我点击按钮时，所有显示的都是背景

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Ellipse是一个GUI对象，因此应该在运行时生成，您还需要将其添加到画布的子集合：

private void Button_Click(object sender, RoutedEventArgs e)
{
    button.Visibility = Visibility.Hidden;

    Ellipse MainSnake = new Ellipse();
    MainSnake.Height = 10;
    MainSnake.Width = 10;
    MainSnake.Fill = Brushes.Yellow;
    Canvas.SetLeft(MainSnake, 250);
    Canvas.SetTop(MainSnake, 150);

    theCanvas.Children.Add(MainSnake);
}

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我正要说同样的话+1.