介绍 using 系统;
using System.Collections;
using System.Data;
using 来;
using 包含;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.Xml.Linq;
using System.Web.SessionState;
using System.Drawing;
namespace usechecknum.ashx
｛///才能,& lt; summary>///才能,codebehindclassname,美元的摘要说明///才能,& lt;/summary>
(网络服务才能(=Namespace “http://tempuri.org/"))
[WebServiceBinding才能(ConformsTo =, WsiProfiles.BasicProfile1_1))
public 才能class doCreateNum : IHttpHandler, IRequiresSessionState
{才能
,,,public void ProcessRequest (HttpContext 上下文)
,,,{
,,,,,context.Response.ContentType =,“文本/html";
,,,,,string checkCode =, GetValidation(5),,//,产生5位随机验证码字符
,,,,,context.Session [“Code"],=, checkCode;,//将字符串保存到会话中,以便需要时进行验证
,,,,,System.Drawing.Bitmap image =, new System.Drawing.Bitmap (70,, 22);
,,,,,Graphics g =, Graphics.FromImage(图片);
,,,,,试一试
,,,,,{
,,,,,,,//生成随机生成器
,,,,,,,Random Random =, new 随机();
,,,,,,,//清空图片背景色
,,,,,,,g.Clear (Color.White);
,,,,,,,//,画图片的背景噪音线
,,,,,,,int 我;
,,,,,,,for (小姐:=,0;,小姐:& lt;, 25;,我+ +)
,,,,,,,{
,,,,,,,,,int x1 =, random.Next (image.Width);
,,,,,,,,,int x2 =, random.Next (image.Width);
,,,,,,,,,int y1 =, random.Next (image.Height);
,,,,,,,,,int y2 =, random.Next (image.Height);
,,,,,,,,,g.DrawLine (new 笔(Color.Silver), x1,日元,x2, y2);
,,,,,,,}
,,,,,,,Font Font =, new System.Drawing.Font (“Arial",, 12日,(System.Drawing.FontStyle.Bold));
,,,,,,,System.Drawing.Drawing2D.LinearGradientBrush brush =, new System.Drawing.Drawing2D.LinearGradientBrush (new 矩形(0,0,image.Width,, image.Height),, Color.Blue,, Color.DarkRed,, 1.2 f, true);
,,,,,,,g.DrawString (checkCode,字体,,刷,,2,,2);
,,,,,,,//画图片的前景噪音点
,,,,,,,g.DrawRectangle (new 笔(Color.Silver), 0, 0), image.Width 作用;1,image.Height 作用;1);
,,,,,,,System.IO.MemoryStream 小姐=,new System.IO.MemoryStream ();
,,,,,,,image.Save (System.Drawing.Imaging.ImageFormat.Gif女士也);
,,,,,,,context.Response.ClearContent ();
,,,,,,,context.Response.ContentType =,“图像/Gif";
,,,,,,,context.Response.BinaryWrite (ms.ToArray ());
,,,,,}
,,,,最后
,,,,,{
,,,,,,,g.Dispose ();
,,,,,,,image.Dispose ();
,,,,,}
,,,}
,,,public string GetValidation (int num)
,,,{
,,,,,string str =,“0123456789 abcdefghijklmnopqrstuvwxyz",,//盎蛘咝春鹤忠残?
,,,,,string validatecode =,““
,,,,,Random rd =, new 随机();
,,,,,for (int 小姐:=,0;,小姐:& lt;, num;,我+ +)
,,,,,{
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本篇文章为大家展示了怎么在asp.net中利用ashx生成一个图形验证码,内容简明扼要并且容易理解,绝对能使你眼前一亮,通过这篇文章的详细介绍希望你能有所收获。
1。写个ashx生成图形验证码
