【免费】ASP.NET验证码的做法资源-CSDN文库

共427个文件

gif：339个

css：30个

htm：29个

需积分: 0 57 浏览量 2008-12-22 14:09:35 上传评论收藏 289KB RAR 举报

ASP.NET验证码是Web开发中的一种安全机制，主要目的是防止恶意自动化的机器人或脚本程序进行非法操作，如垃圾邮件发送、恶意登录等。在ASP.NET框架下，验证码通常以图片形式展示，包含随机生成的字母或数字组合，用户在提交表单时需要输入这些字符以证明他们是真实的人而不是机器。验证码的实现过程包括以下几个步骤： 1. **生成随机字符串**：我们需要生成一个随机的字符串作为验证码的内容。这个字符串通常包含字母和数字的组合，长度可以根据需求调整。ASP.NET提供了一些内置的类，如`Random`类和`Guid`类，可以用来生成随机数据。 2. **创建图片**：生成字符串后，我们需要将其绘制到一张图片上。这可以通过创建一个新的`Bitmap`对象，然后使用`Graphics`类的`DrawString`方法来完成。字体、颜色、背景、扭曲等效果都可以自定义，以增加验证码的可读性难度。 3. **添加噪声**：为了增加验证码的复杂度，我们通常会在图片上添加一些噪声，如随机的线条、点或者像素块。这样可以防止简单的图像识别算法轻易地破解验证码。 4. **保存到Session**：生成的验证码字符串需要存储起来，以便后续验证用户输入时使用。ASP.NET中的`Session`对象非常适合用于此目的，因为它可以保持会话期间的数据。 5. **显示图片**：将生成的图片以HTTP响应的方式发送到客户端浏览器。在ASP.NET中，我们可以创建一个HttpHandler或使用ASP.NET的Image控件来完成这个任务。 6. **用户输入验证**：当用户提交表单时，服务器会检查用户输入的验证码是否与之前存储在Session中的验证码匹配。如果匹配，表单处理继续；如果不匹配，则提示用户重新输入。在给定的文件列表中，我们看到有以下几个文件： - `DAL.cs`：通常代表Data Access Layer（数据访问层），可能包含了与数据库交互的代码，例如验证验证码时可能需要查询用户的输入。 - `CreatePic.cs`：这个文件很可能包含了创建验证码图片的逻辑，包括生成随机字符串和绘制图片。 - `Default2.aspx.cs`：这是ASP.NET Web Forms中的一个后台代码文件，可能包含了处理用户表单提交和验证码验证的代码。 - `eWebEditor`：这可能是某种网页编辑器的组件，可能与表单内容的编辑有关，但不是直接与验证码相关的。了解这些文件的作用，可以帮助初学者更好地理解ASP.NET验证码的实现过程，并能动手实践自己的验证码系统。在实际项目中，还需要考虑性能、可用性以及可访问性等因素，确保验证码既有效又对用户友好。

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ASP.NET验证码的做法（427个子文件）

DAL.cs 6KB

CreatePic.cs 3KB

Default2.aspx.cs 1KB

editor.css 3KB

menuarea.css 624B

dialog.css 424B

editorarea.css 250B

myeditorarea.css 96B

example.css 94B

Thumbs.db 13KB

Thumbs.db 9KB

Thumbs.db 6KB

flower.gif 7KB

ivy.gif 6KB

ewebeditor.gif 5KB

christmas.gif 3KB

citrus.gif 2KB

46.gif 2KB

grid.gif 2KB

hearts.gif 1KB

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file.gif 1KB

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tech.gif 862B

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birthday.gif 726B

modeviewbtn.gif 717B

modeeditbtn.gif 678B

modecodebtn.gif 643B

msn.gif 642B

parentfolder.gif 609B

47.gif 594B

openfolder.gif 591B

zoomin.gif 586B

date.gif 585B

zoommenu.gif 572B

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共 427 条

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