Master.CanYinWu.Utility/VerifyCode.cs

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using System;

using System.Drawing;
using System.Drawing.Imaging;
using System.Globalization;
using System.IO;


namespace Master.CanYinWu.Utility
{
    public class VerifyCode
    {
        /// <summary>  
        /// 生成随机码  
        /// </summary>  
        /// <param  name="length">随机码个数</param>  
        /// <returns></returns>  
        public static string CreateRandomCode(int length)
        {
            return Guid.NewGuid().ToString("N").Substring(0, length);
        }

        /// <summary>  
        /// 创建随机码图片  
        /// </summary>  
        /// <param  name="vcode">验证码</param>
        /// <param name="fontSize">字体大小</param>
        /// <param name="background">背景颜色</param>
        /// <param name="border">边框颜色</param>
        /// <returns>Gif图片二进制流</returns>
        public static byte[] DrawImage(string vcode, float fontSize = 14, Color background = default(Color), Color border = default(Color))
        {
            // 随机转动角度 
            const int RandAngle = 45;

            // var height = (int) (fontSize + 4);
            var width = vcode.Length * (int)fontSize;

            // 创建图片背景 
            using (var map = new Bitmap(width + 3, (int)fontSize + 10))
            {
                using (var graphics = Graphics.FromImage(map))
                {
                    graphics.Clear(background); // 清除画面，填充背景  
                    graphics.DrawRectangle(new Pen(border, 0), 0, 0, map.Width - 1, map.Height - 1); // 画一个边框  
                    // graph.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;//模式 
                    var random = new Random();

                    // 背景噪点生成
                    var blackPen = new Pen(Color.DarkGray, 0);
                    for (var i = 0; i < 50; i++)
                    {
                        int x = random.Next(0, map.Width);
                        int y = random.Next(0, map.Height);
                        graphics.DrawRectangle(blackPen, x, y, 1, 1);
                    }

                    // 验证码旋转，防止机器识别    
                    var chars = vcode.ToCharArray(); // 拆散字符串成单字符数组  
                    // 文字距中