![](/Images/OutliningIndicators/ContractedBlock.gif)
![](/Images/OutliningIndicators/ExpandedBlockStart.gif)
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using System;
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using System.Collections;
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using System.ComponentModel;
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using System.Data;
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using System.Drawing;
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using System.Drawing.Drawing2D;
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using System.Drawing.Imaging;
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using System.Web;
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using System.Web.SessionState;
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using System.Web.UI;
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using System.Web.UI.WebControls;
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using System.Web.UI.HtmlControls;
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using System.IO;
14![](/Images/OutliningIndicators/None.gif)
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namespace MyCompany.Web
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![](/Images/OutliningIndicators/ContractedBlock.gif)
{
17![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
/**//// <summary>
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/// 验证码图片生成
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/// </summary>
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public class ValidateNum : System.Web.UI.Page
21![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
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private void Page_Load(object sender, System.EventArgs e)
23![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
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//生成随机生成器
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Random random=new Random();
26![](/Images/OutliningIndicators/InBlock.gif)
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string validateNum = "";
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string s = "0123456789";
29![](/Images/OutliningIndicators/InBlock.gif)
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for (int i = 0; i < 4; i++)
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{
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validateNum += s[random.Next(s.Length)];
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}
34![](/Images/OutliningIndicators/InBlock.gif)
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HttpContext.Current.Session["validateNum"] = validateNum;
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// 在此处放置用户代码以初始化页面
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Bitmap image = new Bitmap((int)Math.Ceiling(validateNum.Length * 12.5), 22);
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Graphics g = Graphics.FromImage(image);
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try
40![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
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//清空图片背景色
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g.Clear(Color.White);
43![](/Images/OutliningIndicators/InBlock.gif)
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Font font = new Font("Arial", 12, (FontStyle.Bold|FontStyle.Italic));
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LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.OrangeRed, Color.OrangeRed, 1.2f, true);
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g.DrawString(validateNum, font, brush, random.Next(1) + 1, random.Next(1) + 1);
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//画图片的边框线
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g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);
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//保存图片数据
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MemoryStream stream = new MemoryStream();
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image.Save(stream, ImageFormat.Jpeg);
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//输出图片
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Response.Clear();
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Response.ContentType="image/jpeg";
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Response.BinaryWrite(stream.ToArray());
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}
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finally
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{
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g.Dispose();
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image.Dispose();
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}
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}
63![](/Images/OutliningIndicators/InBlock.gif)
64![](/Images/OutliningIndicators/ContractedSubBlock.gif)
Web 窗体设计器生成的代码#region Web 窗体设计器生成的代码
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override protected void OnInit(EventArgs e)
66![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
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//
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// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
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//
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InitializeComponent();
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base.OnInit(e);
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}
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74![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
/**//// <summary>
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/// 设计器支持所需的方法 - 不要使用代码编辑器修改
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/// 此方法的内容。
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/// </summary>
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private void InitializeComponent()
79![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
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this.Load += new System.EventHandler(this.Page_Load);
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}
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#endregion
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}
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}