App_Code/VryImgGen.cs

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using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Drawing;
using System.Text;

namespace CommonLib
{
    /// <summary>
    /// VryImgGen 的摘要说明
    /// </summary>
    public class VryImgGen
    {
        public static string ChineseChars = String.Empty;

        /// <summary>
        /// 英文与数字串
        /// </summary>
        protected static readonly string EnglishOrNumChars = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";

        public VryImgGen()
        {
            rnd = new Random(unchecked((int)DateTime.Now.Ticks));
        }

        /// <summary>
        /// 全局随机数生成器
        /// </summary>
        private Random rnd;

        int length = 5;
        /// <summary>
        /// 验证码长度(默认6个验证码的长度)
        /// </summary>
        public int Length
        {
            get { return length; }
            set { length = value; }
        }

        int fontSize = 14;
        /// <summary>
        /// 验证码字体大小(为了显示扭曲效果，默认30像素，可以自行修改)
        /// </summary>
        public int FontSize
        {
            get { return fontSize; }
            set { fontSize = value; }
        }

        int padding = 2;
        /// <summary>
        /// 边框补(默认4像素)
        /// </summary>