C#Winform窗体中验证码

Question

请问下，winfom窗体中，该用什么方法来实现“生成验证码”的问题（即像asp.net中一样）,具体的步骤？？
有代码的更好（C#代码）？？？

Answer 1

  //你可以用一个label窗体，用其文本窗体显示随机数，然后用textbox的文本值与lable的text值做比较下面是代码的核心部分你看一下吧，对你可能有点帮助 private static char[] constant ={'0','1','2','3','4','5','6','7','8','9',
            'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z',
            'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'
        };
        public Form1()
        {
            InitializeComponent();
        }       
        public static string GetRandomNumber(int Len)
        {
            System.Text.StringBuilder newRandom = new StringBuilder(62);
            Random rd = new Random();
            for (int i = 0; i < Len; i++)
            {
                newRandom.Append(constant[rd.Next(62)]);
            }
            return newRandom.ToString();
        }        private void Form1_Load(object sender, EventArgs e)
        {
            this.label1.Text = GetRandomNumber(5);
        }        private void linkLabel1_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
        {
            this.label1.Text = GetRandomNumber(5);
        }

Answer 2

定义一个验证码以及验证的代码：
  private string code;        public Confirmation()
        {
            InitializeComponent();
        }
        //定义一个验证码的宽度
        private int imgwith = 65;        //定义一个验证码的高度
        private int imgheight = 24;        //验证码要显示的字体
        private Font font = new Font("Arial", 12);        //验证码要显示的字符
        private string s = "0,1,2,3,4,5,6,7,8,9";        //获得随机字符串
        public string get()
        {
            string[] sc = s.Split(',');
            string a = "";            //定义随机数生成器
            Random r = new Random(DateTime.Now.Millisecond);
            int b = -1;
            for (int i = 0; i <= 4; i++)
            {
                b = r.Next(0, sc.Length);//获取一个随机数
                a += sc[b]; //获取对应的字符
            }
            return a;
        }
        //创建随机字符串的图片
        public Bitmap btm(string sb)
        {
            Bitmap bt = new Bitmap(imgwith, imgheight);
            Graphics g = Graphics.FromImage(bt);
            g.Clear(Color.White);
            for (int i = 0; i < sb.Length; i++)
            {
                g.DrawString(sb.Substring(i, 1), font, Brushes.Black, i * 12 + 1, 5);
            }
            g.DrawRectangle(new Pen(Color.Black), 1, 1, 63, 22);
            g.Dispose();
            return bt;
        }
       
        private void button2_Click(object sender, EventArgs e)
        {
            this.Close();
        }        private void Confirmation_Load(object sender, EventArgs e)
        {
            code = get();
            pictureBox1.Image = btm(code);
        }        private void button1_Click(object sender, EventArgs e)
        {
            if (textBox1.Text == code)
            {                this.DialogResult = DialogResult.OK;
            }
            else
            {
                this.DialogResult = DialogResult.No;
            }
           
        }

Answer 3

http://hi.baidu.com/lightrock/blog/item/75f2db0fb5ee242f6059f3b8.htmlusing System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Drawing;public partial class Default2 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        this.CreateCheckCodeImage(GenerateCheckCode());
    }    //产生随机数的函数
    private string GenerateCheckCode()
    {
        int number;
        char code;
        //空字符串且为只读属性
        string checkCode = String.Empty;
        //新建一个随机数产生器
        System.Random random = new Random();
        for (int i = 0; i < 5; i++)
        {   //随机产生一个整数
            number = random.Next();
            //如果随机数是偶数 取余
            if (number % 2 == 0)
                code = (char)('0' + (char)(number % 10));
            else
                //如果随机数是奇数 选择从[A-Z]
                code = (char)('A' + (char)(number % 26));
            //5个字符的组合
            checkCode += code.ToString();
        }
        //将字符串checkCode写入Cookies并且返回字符串 checkCode
        Response.Cookies.Add(new HttpCookie("CheckCode", checkCode));
        return checkCode;
    }
    //建立一个随机图形
    private void CreateCheckCodeImage(string checkCode)
    {
        if (checkCode == null || checkCode.Trim() == String.Empty)
            return;
        //建立一个位图文件 确立长宽
        System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 12.5)), 22);
        Graphics g = Graphics.FromImage(image);
        try
        {
            //生成随机生成器
            Random random = new Random();
            //清空图片背景色
            g.Clear(Color.White);
            //画图片的背景噪音线
            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);
                g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
            }
            //把产生的随机数以字体的形式写入画面
            Font font = new System.Drawing.Font("Arial", 12, (System.Drawing.FontStyle.Bold | System.Drawing.FontStyle.Italic));
            System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true);
            g.DrawString(checkCode, font, brush, 2, 2);
            //画图片的前景噪音点
            for (int i = 0; i < 100; i++)
            {
                int x = random.Next(image.Width);
                int y = random.Next(image.Height);
                image.SetPixel(x, y, Color.FromArgb(random.Next()));
            }
            //画图片的边框线
            g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
            Response.ClearContent();
            Response.ContentType = "image/Gif";
            Response.BinaryWrite(ms.ToArray());
        }
        finally
        {
            g.Dispose();
            image.Dispose();
        }
    }}

Answer 4

遇到问题，首先想到的是搜索一下，还帮你找到另一个！//随机实例化 
Random ran = new Random(); 
int number; 
char code1; 
//取五个数 
for (int i = 0; i < 5; i++) 
{ 
number = ran.Next(); 
if (number % 2 == 0) 
code1 = (char)('0' + (char)(number % 10)); 
else 
code1 = (char)('A' + (char)(number % 26)); //转化为字符 this.code += code1.ToString(); 
} this.gragh = System.Drawing.Graphics.FromImage(this.bitmap); //将位图加载到封装的位图 
Font font = new Font("宋体", 25f); //定义文字格式大小 
this.gragh.Clear(System.Drawing.Color.Yellow); //图片颜色填充 
SolidBrush brush = new SolidBrush(Color.FromArgb(10, 10, 10)); //字体颜色填充 
this.gragh.DrawString(this.code, font, brush, 0, 0); //将字符串画到grash图中。。 
this.bitmap.Save(this.ms, System.Drawing.Imaging.ImageFormat.Gif); //保存到内存而且为gif图片 this.pictureBox1.Image = Image.FromStream(this.ms); 
this.ms.Close();