asp.net實現驗證碼

來源:互聯網
上載者:User
asp.net|驗證碼

#region 實現一個驗證碼的類

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("黑體",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 = "";
}

也綜合了別人的一部分代碼。:)



相關文章

E-Commerce Solutions

Leverage the same tools powering the Alibaba Ecosystem

Learn more >

Apsara Conference 2019

The Rise of Data Intelligence, September 25th - 27th, Hangzhou, China

Learn more >

Alibaba Cloud Free Trial

Learn and experience the power of Alibaba Cloud with a free trial worth $300-1200 USD

Learn more >

聯繫我們

該頁面正文內容均來源於網絡整理,並不代表阿里雲官方的觀點,該頁面所提到的產品和服務也與阿里云無關,如果該頁面內容對您造成了困擾,歡迎寫郵件給我們,收到郵件我們將在5個工作日內處理。

如果您發現本社區中有涉嫌抄襲的內容,歡迎發送郵件至: info-contact@alibabacloud.com 進行舉報並提供相關證據,工作人員會在 5 個工作天內聯絡您,一經查實,本站將立刻刪除涉嫌侵權內容。