HRSys_Prj/yzm2.aspx.cs

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using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.IO;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace GDIyzm_Prj
{
    public partial class yzm2 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                CreateCheckCodeImage(GenerateCheckCodes(4));
            }

        }
        public void ShowAuthCode(Stream stream, out string code)
        {
            Random random = new Random();
            code = random.Next(1000, 9999).ToString();

            Bitmap bitmap = CreateAuthCode(code);
            bitmap.Save(stream, System.Drawing.Imaging.ImageFormat.Gif);
        }
        private string GenerateCheckCodes(int iCount)
        {
            int number;
            string checkCode = String.Empty;
            int iSeed = DateTime.Now.Millisecond;
            System.Random random = new Random(iSeed);
            for (int i = 0; i < iCount; i++)
            {
                number = random.Next(10);
                checkCode += number.ToString();
            }
            Session["CheckCode"] = checkCode;
            return checkCode;
        }

        private Bitmap CreateAuthCode(string str)
        {
            Font fn = new Font("宋体", 12);
            Brush forecolor = Brushes.Black;
            Brush bgcolor = Brushes.White;
            PointF pf = new PointF(5, 5);
            Bitmap bitmap = new Bitmap(100, 25);
            Rectangle rec = new Rectangle(0, 0, 100, 25);
            Graphics gh = Graphics.FromImage(bitmap);
            gh.FillRectangle(bgcolor, rec);
            gh.DrawString(str, fn, forecolor, pf);
            return bitmap;
        }

        private void CreateCheckCodeImage(string checkCode)