C#（.net）如何点击文本框获取验证码？请高手帮忙解决，最好是源代码！谢谢！发我邮箱里也可以 626938448

Answer 1

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

namespace WebApplication1.验证码
{
/// <summary>
/// 完美随机验证码 0.10
/// Verion:0.10
/// Description:随机生成设定验证码，并随机旋转一定角度，字体颜色不同
/// </summary>

public class ValidateCode : System.Web.UI.Page
{
private void Page_Load(object sender, System.EventArgs e)
{
string randomcode = this.CreateRandomCode(4);
Session["ValidateCode"] = randomcode;
//ViewState["ValidateCode"] = randomcode;
this.CreateImage(randomcode);

}

/// <summary>
/// 生成随机码
/// </summary>
/// <param name="length">随机码个数</param>
/// <returns></returns>
private string CreateRandomCode(int length)
{
int rand;
char code;
string randomcode = String.Empty;

//生成一定长度的验证码
System.Random random = new Random();
for(int i=0;i<length;i++)
{
rand = random.Next();

if(rand%3 == 0)
{
code = (char)('A' + (char)(rand%26));
}
else
{
code = (char)('0' + (char)(rand%10));
}

randomcode += code.ToString();
}
return randomcode;
}

/// <summary>
/// 创建随机码图片
/// </summary>
/// <param name="randomcode">随机码</param>
private void CreateImage(string randomcode)
{
int randAngle = 45; //随机转动角度
int mapwidth = (int)(randomcode.Length * 23);
Bitmap map = new Bitmap(mapwidth,28);//创建图片背景
Graphics graph = Graphics.FromImage(map);
graph.Clear(Color.AliceBlue);//清除画面，填充背景
graph.DrawRectangle(new Pen(Color.Black,0),0,0,map.Width-1,map.Height-1);//画一个边框
//graph.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;//模式

Random rand = new Random();

//背景噪点生成
Pen blackPen = new Pen(Color.LightGray,0);
for (int i=0;i<50;i++)
{
int x = rand.Next(0,map.Width);
int y = rand.Next(0,map.Height);
graph.DrawRectangle(blackPen,x,y,1,1);
}

//验证码旋转，防止机器识别
char[] chars = randomcode.ToCharArray();//拆散字符串成单字符数组

//文字距中
StringFormat format = new StringFormat(StringFormatFlags.NoClip);
format.Alignment = StringAlignment.Center;
format.LineAlignment = StringAlignment.Center;

//定义颜色
Color[] c = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple };
//定义字体
string[] font = { "Verdana", "Microsoft Sans Serif", "Comic Sans MS", "Arial", "宋体" };

for(int i=0;i<chars.Length;i++)
{
int cindex = rand.Next(7);
int findex = rand.Next(5);

Font f = new System.Drawing.Font(font[findex],13,System.Drawing.FontStyle.Bold);//字体样式(参数2为字体大小)
Brush b = new System.Drawing.SolidBrush(c[cindex]);

Point dot = new Point(16,16);
//graph.DrawString(dot.X.ToString(),fontstyle,new SolidBrush(Color.Black),10,150);//测试X坐标显示间距的
float angle = rand.Next(-randAngle,randAngle);//转动的度数

graph.TranslateTransform(dot.X,dot.Y);//移动光标到指定位置
graph.RotateTransform(angle);
graph.DrawString(chars[i].ToString(),f,b,1,1,format);
//graph.DrawString(chars[i].ToString(),fontstyle,new SolidBrush(Color.Blue),1,1,format);
graph.RotateTransform(-angle);//转回去
graph.TranslateTransform(2,-dot.Y);//移动光标到指定位置
}
//graph.DrawString(randomcode,fontstyle,new SolidBrush(Color.Blue),2,2); //标准随机码

//生成图片
System.IO.MemoryStream ms = new System.IO.MemoryStream();
map.Save(ms,System.Drawing.Imaging.ImageFormat.Gif);
Response.ClearContent();
Response.ContentType = "image/gif";
Response.BinaryWrite(ms.ToArray());
graph.Dispose();
map.Dispose();
}

#region Web 窗体设计器生成的代码
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
//
InitializeComponent();
base.OnInit(e);
}

/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.Load += new System.EventHandler(this.Page_Load);
}
#endregion
}
}

参考资料：http://blog.sina.com.cn/s/blog_4c495b5f0100f38j.html

Answer 2

在数据库中设计一张表：
create table Images(ID,ImageDirc,Value)，分别存放验证码的ID，图片地址，图片的面值
，
在事件中随机读取一张图片就行了

Answer 3

你给我发封邮件,我下班晚上教你做验证图片
其实那个图片是程序生成的
lincal_wlf@qq.com