protected void Page_Load(object sender, EventArgs e) 
     { 
         showline(); 
     } 
  
     protected void showline() 
     { 
         //数据初始化 
         string[] month = new string[6] { "1", "2", "3", "4", "5", "6"}; 
         float[] d = new float[6] { 1.2f, 1.0f, 1.3f, 1.1f, 1.0f, 1.1f }; 
  
         //画图初始化 
         Bitmap bMap = new Bitmap(800, 500); 
         Graphics gph = Graphics.FromImage(bMap); 
         gph.Clear(Color.LightCyan); 
         //画边框 
         Pen p = new Pen(Color.Black, 2); 
         gph.DrawRectangle(p, 1, 1, 798, 498); 
         //中心点 
         PointF cPt = new PointF(140, 380); 
         //X轴三角形 
         PointF[] xPt = new PointF[3] { new PointF(700 + 15, cPt.Y), new PointF(700, cPt.Y - 4), new PointF(700, cPt.Y + 4) }; 
         //Y轴三角形 
         PointF[] yPt = new PointF[3] { new PointF(cPt.X, cPt.X - 15), new PointF(cPt.X - 4, cPt.X), new PointF(cPt.X + 4, cPt.X) }; 
         //图表标题 
         gph.DrawString("完美国际价格指数", new Font("宋体", 9), Brushes.Black, new PointF(cPt.X + 60, cPt.X)); 
         //画X轴 
         gph.DrawLine(Pens.Black, cPt.X, cPt.Y, 700, cPt.Y); 
         gph.DrawPolygon(Pens.Black, xPt); 
         gph.FillPolygon(new SolidBrush(Color.Black), xPt); 
         gph.DrawString("日期", new Font("宋体", 9), Brushes.Black, new PointF(720, 455)); 
         //画Y轴 
         gph.DrawLine(Pens.Black, cPt.X, cPt.Y, cPt.X, cPt.X); 
         gph.DrawPolygon(Pens.Black, yPt); 
         gph.FillPolygon(new SolidBrush(Color.Black), yPt); 
         gph.DrawString("单位(百万)", new Font("宋体", 9), Brushes.Black, new PointF(25, 30)); 
         //画Y轴刻度 
         for (int i = 1; i  <= 5; i++) 
         { 
             gph.DrawString((i * 0.6).ToString(), new Font("宋体", 9), Brushes.Black, new PointF(cPt.X - 30, cPt.Y - i * 50 - 6)); 
             gph.DrawLine(Pens.Black, cPt.X - 3, cPt.Y - i * 50, cPt.X, cPt.Y - i * 50); 
         } 
         //画X轴刻度 
         for (int i = 1; i  <= month.Length; i++) 
         { 
             gph.DrawString(month[i - 1], new Font("宋体", 9), Brushes.Black, new PointF(cPt.X + i * 50 - 5, cPt.Y + 10)); 
             gph.DrawLine(Pens.Black, cPt.X + i * 50, cPt.Y, cPt.X + i * 50, cPt.Y - 3); 
         } 
         //画数据走势图 
         for (int i = 1; i  <= 6; i++) 
         { 
             //画折线 
             if (i  < 6) 
             { 
                 gph.DrawLine(new Pen(Color.GreenYellow, 2), cPt.X + i * 50, cPt.Y - d[i - 1]* 50