Web_ScienceManage/code.aspx.cs

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using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using Model;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.IO;
using System.Drawing.Imaging;

public partial class code : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

       
CreateCheckCodeImage(CreateCode());
    }

    
        
  //随机生成四位数字
    public string CreateCode()
    {
        string so = "1,2,3,4,5,6,7,8,9,0";
        string[] strArr = so.Split(',');
        string code = "";
        Random rand = new Random();
        for (int i = 0; i < 4; i++)
        {
            code += strArr[rand.Next(0, strArr.Length)];
        }
        Response.Cookies.Add(new HttpCookie("validate", code));
        return code;
    }
    private void CreateCheckCodeImage(string validata)
    {    //若校验码为空,则直接返回    
        if (validata == null || validata.Trim() == String.Empty)
            return;
        //根据校验码的长度确定输出图片的长度    
        System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling(Convert.ToDecimal(validata.Length * 15)), 20);
        //创建Graphics对象    
        Graphics g = Graphics.FromImage(image);
        try
        {
            //清空图片背景色       
            g.Clear(Color.White);
            //画图片的背景噪音线        
            Random random = new Random();
            for (int i = 0; i < 10; i++)
            {
                //噪音线起点坐标(x1,y1),终点坐标(x2,y2)