C#生成图片证件

sing System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            gethua();            
        }
    }
    protected void gethua()
    {
        Random random = new Random();
        Bitmap bt = new Bitmap(351, 402, PixelFormat.Format24bppRgb);
        Graphics g = Graphics.FromImage(bt);
        Font fn1 = new Font("Tahoma", 10, FontStyle.Bold);         
        Font fn = new Font("Tahoma", 9, FontStyle.Bold);     
        g.Clear(Color.Honeydew);
        g.DrawString("中国电子学会电子设计初级工程师认证考试名", fn1, Brushes.Black, new PointF(20, 20));
        g.DrawString("准 考 证", fn1, Brushes.Black, new PointF(140, 50));
        g.DrawString("准考证号", fn, Brushes.Black, new PointF(14, 85));
        g.DrawString("CIE09101080004", fn, Brushes.Black, new PointF(90, 85));
        g.DrawString("考生姓名", fn, Brushes.Black, new PointF(14, 115));
        g.DrawString("李晓杰", fn, Brushes.Black, new PointF(90, 115));
        g.DrawString("考生性别", fn, Brushes.Black, new PointF(14, 145));
        g.DrawString("男", fn, Brushes.Black, new PointF(90, 145));
        g.DrawString("身份证号", fn, Brushes.Black, new PointF(14, 175));
        g.DrawString("410381198408272032", fn, Brushes.Black, new PointF(90, 175));
        g.DrawString("考试时间", fn, Brushes.Black, new PointF(14, 205));
        g.DrawString("2007年11月30号", fn, Brushes.Black, new PointF(90, 205));
        g.DrawString("考试科目", fn, Brushes.Black, new PointF(14, 235));
        g.DrawString("电子设计", fn, Brushes.Black, new PointF(90, 235));
        g.DrawString("考点名称", fn, Brushes.Black, new PointF(14, 265));
        g.DrawString("电子设计工程师证书", fn, Brushes.Black, new PointF(90, 265));
        g.DrawString("考场编号", fn, Brushes.Black, new PointF(14, 295));
        g.DrawString("9101080004", fn, Brushes.Black, new PointF(90, 295));
        g.DrawString("机位编号", fn, Brushes.Black, new PointF(196, 295));
        g.DrawString("080004", fn, Brushes.Black, new PointF(275, 295));
        g.DrawString("交通指南(由各考点提供)", fn, Brushes.Black, new PointF(14, 325));
        string dizhi = "";
                    int j = 320;    //初始坐标
                    for (int z = 0; z < 61; z += 23)  //循环次数
                    {
                        int k = z + 20;  // 第一次为0时
                        if (k > dizhi.Length)  //k是否大于总字数
                        {
                            k = dizhi.Length - k;  // 若大于比如k=45  dizhi.length=40  k=40-45    k=-5
                            int i = k + 20;      //i = -5+20  这样就不至于截取超出范围
                            g.DrawString(dizhi.Substring(z, i), fn, Brushes.Black, new PointF(14, j += 18));
                            break;
                        }
                        g.DrawString(dizhi.Substring(z, 23), fn, Brushes.Black, new PointF(14, j += 18));
                    }
                    //产生杂点
                    for (int i = 0; i < 500; i++)
                    {
                        int x1 = random.Next(bt.Width - 20);
                        int y1 = random.Next(bt.Height - 20);
                        bt.SetPixel(x1, y1, Color.FromArgb(random.Next()));
                    }
                    //产生随机曲线
                    for (int i = 0; i < 50; i++)
                    {
                        int x1 = random.Next(bt.Width - 20);
                        int y1 = random.Next(bt.Height - 20);
                        int x2 = random.Next(1, 30);
                        int y2 = random.Next(1, 20);
                        int x3 = random.Next(15, 45);
                        int y3 = random.Next(70, 270);
                        g.DrawArc(new Pen(Color.FromArgb(random.Next())), x1, y1, x2, y2, x3, y3);
                    }
                    //画直线
                    g.DrawLine(new Pen(Color.Black), 10, 75, 341, 75);
                    g.DrawLine(new Pen(Color.Black), 10, 105, 243, 105);
                    g.DrawLine(new Pen(Color.Black), 10, 135, 243, 135);
                    g.DrawLine(new Pen(Color.Black), 10, 165, 243, 165);
                    g.DrawLine(new Pen(Color.Black), 10, 195, 341, 195);
                    g.DrawLine(new Pen(Color.Black), 10, 225, 341, 225);
                    g.DrawLine(new Pen(Color.Black), 10, 255, 341, 255);
                    g.DrawLine(new Pen(Color.Black), 10, 285, 341, 285);
                    g.DrawLine(new Pen(Color.Black), 10, 315, 341, 315);
                    g.DrawLine(new Pen(Color.Black), 80, 75, 80, 314);
                    g.DrawLine(new Pen(Color.Black), 185, 285, 185, 314);
                    g.DrawLine(new Pen(Color.Black), 265, 285, 265, 314);
                    g.DrawLine(new Pen(Color.Black), 243, 75, 243, 195);
                    //画方框
                    g.DrawRectangle(new Pen(Color.Black), 10, 10, 331, 382);
                    //填充图像
                    System.Drawing.Image newimage = System.Drawing.Image.FromFile(Server.MapPath(sdr["photo"].ToString()));
                    //图像定位
                    g.DrawImage(newimage, 245, 77, 95, 117);
                    //释放图像缓存
                    g.Dispose();
                    //定义产生图片格式
                    //Response.ContentType = "image/Jpeg";
                    //bt.Save(Response.OutputStream, ImageFormat.Jpeg);
                    //图片自动保存路径
                    string dirpath = @"E:/Exam/client/Admin_exam/zkz_image/";
                    if (!Directory.Exists(dirpath))
                    {
                        Directory.CreateDirectory(dirpath);
                    }
                    //bt.Save(Server.MapPath(dirpath + Session.SessionID + ".jpg"), ImageFormat.Jpeg);
                    string lujing = @"E:/Exam/client/Admin_exam/zkz_image/" + Request.QueryString["id"].ToString() + "-" + DateTime.Now.ToString("yyyy-mm-dd") + ".jpg";
                    bt.Save(lujing, ImageFormat.Jpeg);
                    //释放位图缓存
                    bt.Dispose();   
    }   
}