分享
 
 
 

asp.net实现验证码

王朝asp·作者佚名  2006-11-24
窄屏简体版  字體: |||超大  

#region 实现一个验证码的类

public class ValidateCode

{

private Bitmap validateimage;

private Graphics g;

public ValidateCode()

{

validateimage = new Bitmap(120, 30, PixelFormat.Format24bppRgb);

g = Graphics.FromImage(validateimage);

}

public void DrawValidateCode(Page e, string i)

{

g.DrawString(i, new Font("黑体",16,FontStyle.Bold),new SolidBrush(Color.White),new PointF(2,4));

g.FillRectangle(new LinearGradientBrush(new Point(0,0), new Point(120,30), Color.FromArgb(0,0,0,0),Color.FromArgb(255,255,255,255)),0,0,120,30);

//validateimage.Save(e.OutputStream, ImageFormat.Jpeg);

g.Save();

MemoryStream ms=new MemoryStream();

validateimage.Save(ms,System.Drawing.Imaging.ImageFormat.Gif);

e.Response.ClearContent();

e.Response.ContentType="image/gif";

e.Response.BinaryWrite(ms.ToArray());

e.Response.End();

//validateimage.Save(e.MapPath("NumImage/ValidateImage.gif"), ImageFormat.Gif);

//e.End();

}

}

#endregion

private void MakeValidateCode()

{

char[] s = new char[]{"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 num = "";

Random r = new Random();

for(int i = 0; i < 5; i++)

{

num += s[r.Next(0, s.Length)].ToString();

}

((LoginUserInfo)Session["LoginUserInfo"]).ValidateNum = num;

TextBox3.Text = "";

}

调用上面的类即可成功检测验证码.

 
 
 
免责声明:本文为网络用户发布,其观点仅代表作者个人观点,与本站无关,本站仅提供信息存储服务。文中陈述内容未经本站证实,其真实性、完整性、及时性本站不作任何保证或承诺,请读者仅作参考,并请自行核实相关内容。
2023年上半年GDP全球前十五强
 百态   2023-10-24
美众议院议长启动对拜登的弹劾调查
 百态   2023-09-13
上海、济南、武汉等多地出现不明坠落物
 探索   2023-09-06
印度或要将国名改为“巴拉特”
 百态   2023-09-06
男子为女友送行,买票不登机被捕
 百态   2023-08-20
手机地震预警功能怎么开?
 干货   2023-08-06
女子4年卖2套房花700多万做美容:不但没变美脸,面部还出现变形
 百态   2023-08-04
住户一楼被水淹 还冲来8头猪
 百态   2023-07-31
女子体内爬出大量瓜子状活虫
 百态   2023-07-25
地球连续35年收到神秘规律性信号,网友:不要回答!
 探索   2023-07-21
全球镓价格本周大涨27%
 探索   2023-07-09
钱都流向了那些不缺钱的人,苦都留给了能吃苦的人
 探索   2023-07-02
倩女手游刀客魅者强控制(强混乱强眩晕强睡眠)和对应控制抗性的关系
 百态   2020-08-20
美国5月9日最新疫情:美国确诊人数突破131万
 百态   2020-05-09
荷兰政府宣布将集体辞职
 干货   2020-04-30
倩女幽魂手游师徒任务情义春秋猜成语答案逍遥观:鹏程万里
 干货   2019-11-12
倩女幽魂手游师徒任务情义春秋猜成语答案神机营:射石饮羽
 干货   2019-11-12
倩女幽魂手游师徒任务情义春秋猜成语答案昆仑山:拔刀相助
 干货   2019-11-12
倩女幽魂手游师徒任务情义春秋猜成语答案天工阁:鬼斧神工
 干货   2019-11-12
倩女幽魂手游师徒任务情义春秋猜成语答案丝路古道:单枪匹马
 干货   2019-11-12
倩女幽魂手游师徒任务情义春秋猜成语答案镇郊荒野:与虎谋皮
 干货   2019-11-12
倩女幽魂手游师徒任务情义春秋猜成语答案镇郊荒野:李代桃僵
 干货   2019-11-12
倩女幽魂手游师徒任务情义春秋猜成语答案镇郊荒野:指鹿为马
 干货   2019-11-12
倩女幽魂手游师徒任务情义春秋猜成语答案金陵:小鸟依人
 干货   2019-11-12
倩女幽魂手游师徒任务情义春秋猜成语答案金陵:千金买邻
 干货   2019-11-12
 
推荐阅读
 
 
 
>>返回首頁<<
 
靜靜地坐在廢墟上,四周的荒凉一望無際,忽然覺得,淒涼也很美
© 2005- 王朝網路 版權所有