Web/VerifyCode/VerifyCode.aspx.cs

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

namespace Web.VerifyCode
{
    public partial class VerifyCode : System.Web.UI.Page
    {
        public static string HZ;

        /// <summary>
        /// 验证码的最大长度
        /// </summary>
        public int MaxLength
        {
            get { return 10; }
        }
        /// <summary>
        /// 验证码的最小长度
        /// </summary>
        public int MinLength
        {
            get { return 1; }
        }

        protected void Page_Load(object sender, EventArgs e)
        {
            string[] str = CreateValidateNumber(5);

            string strcode = string.Empty;

            for (int i = 0; i < str.Length; i++)
            {
                strcode += str[i];
            }

            CreateCheckCodeImage(str);
            HZ = strcode;
            Response.Write(HZ);

            //验证码存入session
            Class.Session.SetVerifyCode(HZ.ToLower());
        }

        /// <summary>
        /// 生成验证码
        /// </summary>
        /// <param name="length">指定验证码的长度</param>
        /// <returns>验证码</returns>
        public string[] CreateValidateNumber(int length)
        {
            string Vchar = "0,1,2,3,4,5,6,7,8,9,a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p" +
            ",q,r,s,t,u,v,w,x,y,z,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q" +
            ",R,S,T,U,V,W,X,Y,Z";

            string[] VcArray = Vchar.Split(new Char[] { ',' });//拆分成数组