csdn差不多的验证码。

来源：互联网发布：head first python 编辑：程序博客网时间：2024/04/20 19:12

using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Collections;

namespace ValidateCode
{
    public class VCode
    {
        public MemoryStream DrawVCode(string content)
        {
            System.Random random = new Random();

            //创建图片对象
            System.Drawing.Bitmap image = new Bitmap((int)content.Length * 17, 30);
            Graphics gh = Graphics.FromImage(image);

            ArrayList bgcolor = new ArrayList();
            bgcolor.Add(Color.Honeydew);
            bgcolor.Add(Color.AliceBlue);
            bgcolor.Add(Color.White);
            bgcolor.Add(Color.Azure);
            bgcolor.Add(Color.OldLace);
            bgcolor.Add(Color.Lavender);
            gh.Clear((Color)bgcolor[random.Next(0, 5)]);

            //噪音线颜色数组
            System.Collections.ArrayList c = new ArrayList();
            c.Add(Color.Silver);
            c.Add(Color.SeaShell);
            c.Add(Color.SkyBlue);

            for (int i = 0; i < 25; i++)
            {
                int x1 = random.Next(image.Width);
                int x2 = random.Next(image.Width);
                int y1 = random.Next(image.Height);
                int y2 = random.Next(image.Height);

                gh.DrawLine(new Pen((Color)c[random.Next(0, 2)]), x1, y1, x2, y2);
            }
            //噪音点
            for (int i = 0; i < 200; i++)
            {
                int x = random.Next(1, image.Width - 2);
                int y = random.Next(1, image.Height - 2);

image.SetPixel(x, y, Color.FromArgb(random.Next()));
}

            //设定字体颜色
            System.Collections.ArrayList cb = new ArrayList();
            cb.Add(Color.Black);
            cb.Add(Color.DarkBlue);
            cb.Add(Color.Purple);
            cb.Add(Color.Indigo);
            cb.Add(Color.DarkRed);
            cb.Add(Color.IndianRed);
            char[] CArray = content.ToCharArray();
            for (int i = 0; i < CArray.Length; i++)
            {
                string cstr = CArray[i].ToString();
                Font f = new Font("Times New Roman", 15);
                gh.DrawString(cstr, f, new SolidBrush((Color)cb[random.Next(0, 5)]), 2 + ((int)f.SizeInPoints) * i, 2);
            }

gh.DrawRectangle(new Pen((Color)cb[random.Next(0, 5)]), 0, 0, image.Width - 1, image.Height - 1); //汇出边框

            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
            Response.ClearContent();
            return ms.ToArray();
        }

}
}
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编译成组件