在winform中绘一条直线

在winform中绘一条直线：

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            this.Paint += Form1_Paint;
        }
 
        private void Form1_Paint(object sender, PaintEventArgs e) 
        {
            DrawLShapeLine(e.Graphics, 10, 10, 20, 40); 
        }
        public void DrawLShapeLine(System.Drawing.Graphics g, int intMarginLeft, int intMarginTop, int intWidth, int intHeight)
        {
            Pen myPen = new Pen(Color.Black);
            myPen.Width = 2;
            // Create array of points that define lines to draw. 
            int marginleft = intMarginLeft;
            int marginTop = intMarginTop;
            int width = intWidth;
            int height = intHeight;
            int arrowSize = 3;
            Point[] points = 
         { 
            new Point(marginleft, marginTop), 
            new Point(marginleft, height + marginTop), 
            new Point(marginleft + width, marginTop + height), 
            // Arrow 
            new Point(marginleft + width - arrowSize, marginTop + height - arrowSize), 
            new Point(marginleft + width - arrowSize, marginTop + height + arrowSize), 
            new Point(marginleft + width, marginTop + height) 
         };
 
            g.DrawLines(myPen, points);
        } 
    }