asp.net生成验证码代码（纯中文）

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.Text
//添加引用
using System.Drawing
//添加引用
///

/// CheckCode_Ch 的摘要说明
///

public class CheckCode_Ch

{
public CheckCode_Ch()

{
//
// TODO: 在此处添加构造函数逻辑
//
}
private static object[] CreateString()

{
//定义一个数组存储汉字编码的组成元素
string[] str = new string[16]
{ "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" }

Random ran = new Random()
//定义一个随机数对象
object[] bytes = new object[4]

for (int i = 0
i < 4
i++)

{
//获取区位码第一位
int ran1 = ran.Next(11, 14)

string str1 = str[ran1].Trim()

//获取区位码第二位并防止数据重复
ran = new Random(ran1 * unchecked((int)DateTime.Now.Ticks) + i)

int ran2

if (ran1 == 13)

{
ran2 = ran.Next(0, 7)

}
else

{
ran2 = ran.Next(0, 16)

}
string str2 = str[ran2].Trim()

//获取区位码第三位
ran = new Random(ran2 * unchecked((int)DateTime.Now.Ticks) + i)

int ran3 = ran.Next(10, 16)

string str3 = str[ran3].Trim()

//获取区位码第四位
ran = new Random(ran3 * unchecked((int)DateTime.Now.Ticks) + i)

int ran4

if (ran3 == 10)

{
ran4 = ran.Next(1, 16)

}
else if (ran3 == 15)

{
ran4 = ran.Next(0, 15)

}
else

{
ran4 = ran.Next(0, 16)

}
string str4 = str[ran4].Trim()

//定义字节变量存储产生的随机汉字区位码
byte byte1 = Convert.ToByte(str1 + str2, 16)

byte byte2 = Convert.ToByte(str3 + str4, 16)

byte[] stradd = new byte[]
{ byte1, byte2 }

//将产生的汉字字节放入数组
bytes.SetValue(stradd, i)

}
return bytes

}
private static string GetString()

{
Encoding gb = Encoding.GetEncoding("gb2312")

object[] bytes = CreateString()

//根据汉字字节解码出中文汉字
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[])))

string str = str1 + str2 + str3 + str4

HttpContext.Current.Response.Cookies.Add(new HttpCookie("CheckCode", str))

return str

}
public static void GraphicsImage()

{
System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((GetString().Length * 22.5)), 22)

Graphics g = Graphics.FromImage(image)
//创建画布
try

{
//生成随机生成器
Random random = new Random()

//清空图片背景色
g.Clear(Color.White)

//画图片的背景噪音线
for (int i = 0
i < 1
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.Black), x1, y1, x2, y2)

}
Font font = new System.Drawing.Font("Couriew New", 12, System.Drawing.FontStyle.Bold)

System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush
(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true)

g.DrawString(GetString(), font, brush, 2, 2)

//画图片的前景噪音点
for (int i = 0
i < 50
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)

System.IO.MemoryStream ms = new System.IO.MemoryStream()

image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif)

HttpContext.Current.Response.ClearContent()

HttpContext.Current.Response.ContentType = "image/Gif"

HttpContext.Current.Response.BinaryWrite(ms.ToArray())

}
catch (Exception ms)

{
HttpContext.Current.Response.Write(ms.Message)

}
}
}

using System

using System.Collections

using System.Configuration

using System.Data

using System.Web

using System.Web.Security

using System.Web.UI

using System.Web.UI.HtmlControls

using System.Web.UI.WebControls

using System.Web.UI.WebControls.WebParts

public partial class UserValidator_ChineseCheckCode : System.Web.UI.Page

{
protected void Page_Load(object sender, EventArgs e)

{
CheckCode_Ch.GraphicsImage()
//调用方法生成四位汉字验证码
}
}

style="width: 75px
height: 24px" align="left" />
/>

protected void imgBtnLogin_Click(object sender, ImageClickEventArgs e)

{
HttpCookie cookie = Request.Cookies["CheckCode"]

if (cookie.Value == this.Validator.Text.Trim())

{
//。。。
}
else

{
Response.Write("")

return

}
}