Web/Models/ValidateCode.cs

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using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Web;

namespace Web.Models
{
    public class ValidateCode
    {
        //生成验证码
        public string GenerateCheckCode()
        {
            int number;
            char code;
            string checkCode = String.Empty;

            System.Random random = new Random();

            for (int i = 0; i <6; i++)
            {
                number = random.Next();

                if (number % 2 == 0)
                    code = (char)('0' + (char)(number % 10));
                else
                    code = (char)('A' + (char)(number % 26));

                checkCode += code.ToString();
            }

            HttpContext.Current.Session["ValidateCode"] = checkCode;

            return checkCode;
        }

        public void CreateCheckCodeImage(string checkCode)
        {
            if (checkCode == null || checkCode.Trim() == String.Empty)
                return;

            System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 12.5)), 22);
            System.Drawing.Graphics g = Graphics.FromImage(image);

            try
            {
                //生成随机生成器 
                Random random = new Random();
                //清空图片背景色 
                g.Clear(Color.White);

                //画图片的背景噪音线 
                for (int i = 0; i < 25; i++)
                {
                    int x1 = random.Next(image.Width);
                    int x2 = random.Next(image.Width);
                    int y1 = random.Next(image.Height);
                    int y2 = random.Next(image.Height);

                    g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);