使用ASP.NET动态生成图片

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Imaging;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

namespace Birdshome
{
    /**//// <summary>
    /// Summary description for _Default.
    /// </summary>
    public class _Default : System.Web.UI.Page
    {
        int m_Unit = 3;

        private void Page_Load(object sender, System.EventArgs e)
        {
            // Put user code to initialize the page here
            int counter_width = 32/8;
            int counter_height =16;
            Bitmap bmp = new Bitmap(counter_width*m_Unit*8, counter_height*m_Unit);
            GenerateBitmap(bmp);
            Response.Clear();
            Response.ContentType = "image/jpeg";
               bmp.Save(Response.OutputStream, ImageFormat.Jpeg);
        }

        Web Form Designer generated code#region Web Form Designer generated code
        override protected void OnInit(EventArgs e)
        {
            //
            // CODEGEN: This call is required by the ASP.NET Web Form Designer.
            //
            InitializeComponent();
            base.OnInit(e);
        }
        
        /**//// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {    
            this.Load += new System.EventHandler(this.Page_Load);
        }
        #endregion

        private void GenerateBitmap(Bitmap bmp)
        {
            //#define counter_width 32
            //#define counter_height 16
            int counter_width = 32/8;
            int counter_height =16;
            byte [] counter_bits = new byte[]
            {
                0x00, 0x00, 0x00, 0x00,  0x00, 0x00, 0x00, 0x00, 
                0x00, 0x00, 0x00, 0x00,  0x00, 0x00, 0x00, 0x00, 
                0x00, 0x00, 0x00, 0x00,  0x00, 0x00, 0x00, 0x00, 
                0x3E, 0x1C, 0x7F, 0x7F,  0x63, 0x06, 0x03, 0x03, 
                0x60, 0x03, 0x03, 0x03,  0x60, 0x03, 0x03, 0x03, 
                0x3C, 0x3F, 0x3F, 0x3F,  0x60, 0x63, 0x60, 0x60, 
                0x60, 0x63, 0x60, 0x60,  0x60, 0x63, 0x60, 0x60, 
                0x63, 0x63, 0x63, 0x63,  0x3E, 0x3E, 0x3E, 0x3E
            };
            Graphics g = Graphics.FromImage(bmp);
            for( int i=0 ; i < counter_height ; i++ )
            {
                for( int j=0 ; j < counter_width ; j++ )
                {
                    byte by = counter_bits[counter_width*i+j];
                    for( int k=0 ; k < 8 ; k++ )
                    {
                        byte bit = 0;
                        bit = (byte)(by & 0x01);
                        Rectangle rect = new Rectangle(k*m_Unit+j*8*m_Unit, i*m_Unit, m_Unit, m_Unit);
                        Brush brush;

                        if( bit == 0x01 )
                        {
                            brush = Brushes.Yellow;
                        }
                        else
                        {
                            brush = Brushes.Blue;
                        }
                        g.FillRectangle(brush, rect);
                        by = (byte)(by >> 1);
                    }
                }
            }
        }
    }
}