using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;

namespace Letter.Data.Command
{
    public class ValidateCode
    {
        /// <summary>
        /// 创建验证码的图片
        /// </summary>
        /// <param name="validateCode">验证码</param>
        public byte[] CreateValidateGraphic(string validateCode)
        {
            
            Bitmap image = new Bitmap((int)Math.Ceiling(validateCode.Length * 12.0), 22);
            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);
                //画图片的干扰线
                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);
                }
                Font font = new Font("Arial", 12, (FontStyle.Bold | FontStyle.Italic));
                LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height),
                 Color.Blue, Color.DarkRed, 1.2f, true);
                g.DrawString(validateCode, font, brush, 3, 2);
                //画图片的前景干扰点
                for (int i = 0; i < 100; i++)
                {
                    int x = random.Next(image.Width);
                    int y = random.Next(image.Height);
                    image.SetPixel(x, y, Color.FromArgb(random.Next()));
                }
                //画图片的边框线
                g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);
                //保存图片数据
                MemoryStream stream = new MemoryStream();
                image.Save(stream, ImageFormat.Jpeg);
                //输出图片流
                return stream.ToArray();
            }
            finally
            {
                g.Dispose();
                image.Dispose();
            }
        }
        /// <summary>
        /// 生成数字随机码
        /// </summary>
        /// <param name="count">随机位数</param>
        /// <returns></returns>
        public string CreateValidateCode(int count)
        {
            Random r = new Random();
            string code = string.Empty;
            for (int i = 0; i < count; i++)
            {
                code += r.Next(0, 9)+"";
            }
            return code;
        }
    }
}

controller调用

/// <summary>
        /// 获取验证码
        /// </summary>
        /// <returns></returns>
        public ActionResult GetValidateCode()
        {
            ValidateCode vCode = new ValidateCode();
            string code = vCode.CreateValidateCode(4);
            session["ValidateCode"] = code;
            byte[] bytes = vCode.CreateValidateGraphic(code);
            return File(bytes, @"image/jpeg");
        }