WELOA.VerificationCode/CheckCode.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Drawing;
using System.IO;
using System.Drawing.Imaging;
using System.Web;

namespace WELOA.VerificationCode
{
    public class CheckCode
    {
        
        private void checkCodes(string checkCode)
        {
            int num2;
            int width = checkCode.Length * 13;
            Bitmap image = new Bitmap(width, 0x17);
            Graphics graphics = Graphics.FromImage(image);
            graphics.Clear(Color.White);
            Color[] colorArray = new Color[] { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple };
            string[] strArray = new string[] { "Verdana", "Microsoft Sans Serif", "Comic Sans MS", "Arial", "宋体" };
            Random random = new Random();
            for (num2 = 0; num2 < 50; num2++)
            {
                int x = random.Next(image.Width);
                int y = random.Next(image.Height);
                graphics.DrawRectangle(new Pen(Color.LightGray, 0f), x, y, 1, 1);
            }
            for (num2 = 0; num2 < checkCode.Length; num2++)
            {
                int index = random.Next(7);
                int num6 = random.Next(5);
                Font font = new Font(strArray[num6], 10f, FontStyle.Bold);
                Brush brush = new SolidBrush(colorArray[index]);
                int num7 = 4;
                if (((num2 + 1) % 2) == 0)
                {
                    num7 = 2;
                }
                graphics.DrawString(checkCode.Substring(num2, 1), font, brush, (float)(3 + (num2 * 12)), (float)num7);
            }
            graphics.DrawRectangle(new Pen(Color.Black, 0f), 0, 0, image.Width - 1, image.Height - 1);
            MemoryStream stream = new MemoryStream();
            image.Save(stream, ImageFormat.Jpeg);
            HttpContext.Current.Response.ClearContent();
            HttpContext.Current.Response.ContentType = "image/Jpeg";
            HttpContext.Current.Response.BinaryWrite(stream.ToArray());
            graphics.Dispose();
            image.Dispose();
        }

        public static void DrawImage()
        {
            CheckCode code = new CheckCode();
            HttpContext.Current.Session["CheckCode"] = code.RndNum(4);
            code.checkCodes(HttpContext.Current.Session["CheckCode"].ToString());
        }