SalesSystemOnline/UI/Common/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 System.Drawing;

namespace SalesSystemOnline.Web.Common
{
    public partial class Code : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            string checkCode = CreateRandomCode(4);
            Session["Code"] = checkCode;
            CreateImage(checkCode);
        }
        private string CreateRandomCode(int CodeCount)  //产生随机字符串
        {
            string allChar = "0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F,G,H,i,J,K,M,N,P,Q,R,S,T,U,W,X,Y,Z";
            string[] allCharArray = allChar.Split(',');
            string RandomCode = "";
            int temp = -1;
            Random rand = new Random();
            for (int i = 0; i < CodeCount; i++)
            {
                if (temp != -1)
                {
                    rand = new Random(temp * i * ((int)DateTime.Now.Ticks));
                }
                int t = rand.Next(33);
                while (temp == t)
                {
                    t = rand.Next(33);
                }
                temp = t;
                RandomCode += allCharArray[t];
            }
            return RandomCode;
        }

        //页面设置没有缓存
        private void SetPageNoCache()
        {
            Response.Buffer = true;
            Response.ExpiresAbsolute = System.DateTime.Now.AddSeconds(-1);
            Response.Expires = 0;
            Response.CacheControl = "no-cache";
            Response.AppendHeader("Pragma", "No-Cache");
        }

        //设置背景图片
        private void CreateImage(string checkCode)