如果視窗是canvas就是

Ellipse ellipse = new Ellipse();

ellipse.Width = 50;

ellipse.Height = 100;

ellipse.Stroke = new SolidColorBrush(Colors.Blue);

ellipse.Fill = new SolidColorBrush(Colors.Green);

ellipse.SetValue(Canvas.LeftProperty, 50D);

ellipse.SetValue(Canvas.TopProperty, 100D);

canvas.Children.Add(ellipse);

如果是Grid

ellipse.SetValue(Canvas.LeftProperty, 50D);

ellipse.SetValue(Canvas.TopProperty, 100D);

這兩句就改成

ellipse.SetValue(Grid.ColumnProperty, 1);

ellipse.SetValue(Grid.RowProperty, 1);

資料都是舉例