C#生成中文汉字验证码源码

using System;
using System.Data;
using System.Configuration;
using System.Collections;
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;

public partial class Admin_ValidCode : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
this.CreateCheckCodeImage(GenerateCheckCode());

}
private string GenerateCheckCode()
{
int number;
//char code;
string checkCode = String.Empty;

System.Random random = new Random();

Encoding gb = Encoding.GetEncoding("gb2312");
//调用函数产生4个随机中文汉字编码
object[] bytes = CreateRegionCode(6);
//根据汉字编码的字节数组解码出中文汉字
string str1 = gb.GetString((byte[])Convert.ChangeType(bytes[0], typeof(byte[])));
string str2 = gb.GetString((byte[])Convert.ChangeType(bytes[1], typeof(byte[])));
string str3 = gb.GetString((byte[])Convert.ChangeType(bytes[2], typeof(byte[])));
string str4 = gb.GetString((byte[])Convert.ChangeType(bytes[3], typeof(byte[])));
//输出的控制台
checkCode = str1 + str2 + str3 + str4;

//for (int i = 0; i < 5; i++)
//{
// number = random.Next();

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

// checkCode += code.ToString();
//}

Response.Cookies.Add(new HttpCookie("ValidCode",LjfLib.Encrypt.AES.EncryptAes(checkCode)));
//Session["ValidCode"] = checkCode;

return checkCode;
}

#region 产生波形滤镜效果

private static object[] CreateRegionCode(int strlength)
{
//定义一个字符串数组储存汉字编码的组成元素
string[] rBase = new String[16] { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };

Random rnd = new Random();

//定义一个object数组用来
object[] bytes = new object[strlength];

/*每循环一次产生一个含两个元素的十六进制字节数组，并将其放入bject数组中
每个汉字有四个区位码组成
区位码第1位和区位码第2位作为字节数组第一个元素
区位码第3位和区位码第4位作为字节数组第二个元素
*/
for (int i = 0; i < strlength; i++)
{
//区位码第1位
int r1 = rnd.Next(11, 14);
string str_r1 = rBase[r1].Trim();

//区位码第2位
rnd = new Random(r1 * unchecked((int)DateTime.Now.Ticks) + i);//更换随机数发生器的

//种子避免产生重复值
int r2;
if (r1 == 13)
{
r2 = rnd.Next(0, 7);

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