如果你想要的是Bézier曲线,就试图:

private void AddBeziersExample(PaintEventArgs e)
{

    // Adds a Bezier curve.
    Point[] myArray =
             {
                 new Point(100, 50),
                 new Point(120, 150),
                 new Point(140, 100)
             };

    // Create the path and add the curves.
    GraphicsPath myPath = new GraphicsPath();
    myPath.AddBeziers(myArray);

    // Draw the path to the screen.
    Pen myPen = new Pen(Color.Black, 2);
    e.Graphics.DrawPath(myPen, myPath);
}