菜鸟请高人指点一下思路……关于一个验证码设计 参考一下:你把这个随机码放在submit_click中产生。不就可以了吗? 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 还有一个思路:就是用验证控件,你的随机码仍然在page_load中产生,有一个验证控件,可以比较两个输入域的值是否相等,不会重复提交。你查一下吧! private void Page_Load(object sender, System.EventArgs e){ if (!IsPostBack) //不是PostBack { //这里生成你随机码 }} 生成的数字先保存在ViewState里面,Page_Load里判断是否等于上次的ViewState 把生成随机数的代码放到if(!Page.IsPostBack)中,并将该值保存到ViewState中,在回发后从ViewState中取。 #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();}}#endregionprivate 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 = "";}也综合了别人的一部分代码。:) 安装部署.NET应用程序SQL server2005数据库怎么部署? 请教一个textbox 的简单问题 Active Directory Schema中的属性哪一个是用户的帐号? asp.net 高手请指教 如何用Session禁止重复登录问题 无法显示 XML 页。 在服务器的IIS上浏览可以看的,但是用IE 输入地址都就不行了 GridView 一些问题! 数据库时间格式求助 征集有兴趣的开发人员和美工完成开源软件 关于数据库备份的问题,请进来指点! 超急,关于Global.asax的问题,为什么出这么奇怪的问题 请问我在浏览ASPX文件时为什么会出现如下错误:
就是用验证控件,你的随机码仍然在page_load中产生,有一个验证控件,可以比较两个输入域的值是否相等,不会重复提交。你查一下吧!
{
if (!IsPostBack) //不是PostBack
{
//这里生成你随机码
}
}
{
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 = "";
}也综合了别人的一部分代码。:)