WEBUI/Inc/Checkcode.aspx.cs

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using System;
using System.Collections.Generic;

using System.Drawing;

public partial class Inc_Checkcode : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        //调用函数将验证码生成图片
        this.CreateCheckCodeImage(GenerateCheckCode());
    }

    private string GenerateCheckCode()
    {  //产生四位的随机字符串
        int number;
        char code;
        string checkCode = String.Empty;

        System.Random random = new Random();

        for (int i = 0; i < 4; i++)
        {
            number = random.Next();
            code = (char)('0' + (char)(number % 10));
            checkCode += code.ToString();
        }
        Session["CheckCode"] = checkCode;//用于客户端校验码比较

        return checkCode;
    }

    private void CreateCheckCodeImage(string checkCode)
    {  //将验证码生成图片显示
        if (checkCode == null || checkCode.Trim() == String.Empty)
            return;

        System.Drawing.Bitmap image = new System.Drawing.Bitmap(55, 20);
        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 < 8; 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.FromArgb(random.Next(255), random.Next(255), random.Next(255))
                    ), x1, y1, x2, y2);
            }