Asp.net无刷新中文验证码调试成功,特分享给大家
以前在网上找到了很多关于中文验证码的文章(园子里也有,大家自己去找吧),但是都没有调测成功,总出现
The target '__Page' for the callback could not be found or did not implement ICallbackEventHandler不能ICallbackEventHandler回掉的错误,我进行了一下修正并整理,现在可以实现了中文验证码无刷新的操作,现特把全部源码分享给大家
核心源码
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public partial class Image : System.Web.UI.Page
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{
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protected void Page_Load(object sender, EventArgs e)
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{
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CreateCheckCodeImage(GenCode(4));
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}
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/**//// <summary>
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/// '产生随机字符串
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/// </summary>
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/// <param name="num">随机出几个字符</param>
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/// <returns>随机出的字符串</returns>
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private string GenCode(int num)
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{
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string str = "的一是在不了有和人这中大为上个国我以要他时来用们...";
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char[] chastr = str.ToCharArray();
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string code = "";
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Random rd = new Random();
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int i;
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for (i = 0; i < num; i++)
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{
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//code += source[rd.Next(0, source.Length)];
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code += str.Substring(rd.Next(0, str.Length), 1);
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}
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return code;
26![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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}
28![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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/**//// <summary>
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/// 生成图片(增加背景噪音线、前景噪音点)
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/// </summary>
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/// <param name="checkCode">随机出字符串</param>
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private void CreateCheckCodeImage(string checkCode)
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{
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if (checkCode.Trim() == "" || checkCode == null)
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return;
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Session["Code"] = checkCode; //将字符串保存到Session中,以便需要时进行验证
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System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)(checkCode.Length * 21.5), 22);
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Graphics g = Graphics.FromImage(image);
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try
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{
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//生成随机生成器
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Random random = new Random();
44![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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//清空图片背景色
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g.Clear(Color.White);
47![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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// 画图片的背景噪音线
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int i;
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for (i = 0; i < 25; i++)
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{
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int x1 = random.Next(image.Width);
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int x2 = random.Next(image.Width);
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int y1 = random.Next(image.Height);
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int y2 = random.Next(image.Height);
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g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
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}
58![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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Font font = new System.Drawing.Font("Arial", 12, (System.Drawing.FontStyle.Bold));
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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);
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g.DrawString(checkCode, font, brush, 2, 2);
62![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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//画图片的前景噪音点
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g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);
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System.IO.MemoryStream ms = new System.IO.MemoryStream();
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image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
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Response.ClearContent();
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Response.ContentType = "image/Gif";
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Response.BinaryWrite(ms.ToArray());
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}
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catch
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{
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g.Dispose();
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image.Dispose();
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}
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}
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希望该源码只是一个抛砖引玉的作用,你可以进行修改,比如说改中文字库,字体背景噪音等等
默认帐号密码均为51aspx,这里用户登录只是一个验证的例子,没有其他功能
作者51aspx
完整源码下载地址http://www.51aspx.com/CV/ZhongWenYanZhengMa
liudao-MVP