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The author:(作者)delvpublished in(发表于) 2014/1/23 3:12:16 Asp.net无刷新中文验证码调试成功，特分享给大家_[Asp.Net教程]
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
1 public partial class Image : System.Web.UI.Page 2 { 3 protected void Page_Load(object sender, EventArgs e) 4 { 5 CreateCheckCodeImage(GenCode(4)); 6 } 7 /**//**//**//// 8 /// '产生随机字符串 9 /// 10 /// 随机出几个字符11 /// 随机出的字符串12 private string GenCode(int num)13 {14 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...";15 char[] chastr = str.ToCharArray();16 17 string code = "";18 Random rd = new Random();19 int i;20 for (i = 0; i < num; i++)21 {22 //code += source[rd.Next(0, source.Length)];23 code += str.Substring(rd.Next(0, str.Length), 1);24 }25 return code;2627 }2829 /**//**//**//// 30 /// 生成图片（增加背景噪音线、前景噪音点）31 /// 32 /// 随机出字符串33 private void CreateCheckCodeImage(string checkCode)34 {35 if (checkCode.Trim() == "" || checkCode == null)36 return;37 Session["Code"] = checkCode; //将字符串保存到Session中，以便需要时进行验证38 System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)(checkCode.Length * 21.5), 22);39 Graphics g = Graphics.FromImage(image);40 try41 {42 //生成随机生成器43 Random random = new Random(); 4445 //清空图片背景色46 g.Clear(Color.White); 4748 // 画图片的背景噪音线49 int i;50 for (i = 0; i < 25; i++)51 {52 int x1 = random.Next(image.Width);53 int x2 = random.Next(image.Width);54 int y1 = random.Next(image.Height);55 int y2 = random.Next(image.Height);56 g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);57 }5859 Font font = new System.Drawing.Font("Arial", 12, (System.Drawing.FontStyle.Bold));60 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);61 g.DrawString(checkCode, font, brush, 2, 2);6263 //画图片的前景噪音点64 g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);65 System.IO.MemoryStream ms = new System.IO.MemoryStream();66 image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);67 Response.ClearContent();68 Response.ContentType = "image/Gif";69 Response.BinaryWrite(ms.ToArray());7071 }72 catch73 {74 g.Dispose();75 image.Dispose();76 }7778 }
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
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