Graphics 帮个忙
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Drawing;
using System.Drawing.Imaging;

public partial class Curve_Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        DrawLine();
    }

    public void DrawLine()
    {
        //初始化数据
        string[] month = new string[12] { "1月", "2月", "3月", "4月", "5月", "6月", "7月", "8月", "9月", "10月", "11月", "12月" };
        float[] d = new float[12] { 20.5F, 30.8F, 14.7F, 17.9F, 23.9F, 78.5F, 56.4F, 39.8F, 47.8F, 10.5F, 29.5F, 41.3F };
        //画图初始化
        Bitmap bmap = new Bitmap(500, 500);
        Graphics gph = Graphics.FromImage(bmap);
        gph.Clear(Color.White);
        PointF cp = new PointF(40, 420);//中心点
        PointF[] xpt = new PointF[3] { new PointF(cp.Y+15,cp.Y),new PointF(cp.Y,cp.Y-8),new PointF(cp.Y,cp.Y+8)};//X轴三角形
        PointF[] ypt = new PointF[3] { new PointF(cp.X,cp.X-15),new PointF(cp.X-8,cp.X), new PointF(cp.X+8,cp.X)};//Y轴三角形
        gph.DrawString("某工厂某产品月生产量图", new Font("宋体", 14), Brushes.Black, new PointF(cp.X + 60, cp.X));//图表标题
        //画X轴
        gph.DrawLine(Pens.Black, cp.X, cp.Y, cp.Y, cp.Y);
        gph.DrawPolygon(Pens.Black, xpt);
        gph.FillPolygon(new SolidBrush(Color.Black), xpt);
        gph.DrawString("月份", new Font("宋体", 12), Brushes.Black, new PointF(cp.Y + 10, cp.Y + 10));
        //画Y轴
        gph.DrawLine(Pens.Black, cp.X, cp.Y, cp.X, cp.X);
        gph.DrawPolygon(Pens.Black, ypt);
        gph.FillPolygon(new SolidBrush(Color.Black), ypt);
        gph.DrawString("单位:万", new Font("宋体", 12), Brushes.Black, new PointF(0, 7));
        for (int i = 1; i <= 12; i++)
        {
            if (i < 11)
            {
                gph.DrawString((i * 10).ToString(), new Font("宋体", 11), Brushes.Black, new PointF(cp.X - 30, cp.Y - i * 30 - 6));