validate.ashx

这里只显示每个文件的开头 60 行。登录后可以解锁完整代码。

微信扫码关注公众号，代码整理好后第一时间通知你。

<%@ WebHandler Language="C#" Class="ValidateCode" %>

using System;
using System.Web;
using System.Drawing;
using System.Web.SessionState;

public class ValidateCode : IHttpHandler,IRequiresSessionState {
   
    public void ProcessRequest (HttpContext context) {
        CreateCheckCodeImage(GenerateCheckCode(context),context);
    }

    private string GenerateCheckCode(HttpContext context)
    {
        int number;
        char code;
        string checkCode = String.Empty;

        System.Random random = new Random();

        for (int i = 0; i < 5; i++)
        {
            number = random.Next();

            if (number % 2 == 0)
                code = (char)('0' + (char)(number % 10));
            else
                code = (char)('A' + (char)(number % 26));

            checkCode += code.ToString();
        }

        //儲存在cookie
        context.Response.Cookies.Add(new HttpCookie("CheckCode", checkCode));
       
        //儲存在session
        context.Session["CheckCode"] = checkCode;

        return checkCode;
    }

    private void CreateCheckCodeImage(string checkCode,HttpContext context)
    {
        if (checkCode == null || checkCode.Trim() == String.Empty)
            return;

        System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 12.5)), 22);
        Graphics g = Graphics.FromImage(image);

        try
        {
            //生成?机生成器
            Random random = new Random();

            //清空?片背景色
            g.Clear(Color.White);

            //??片的背景噪音?
            for (int i = 0; i < 25; i++)