C#登入頁面驗證碼重新整理

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驗證碼產生頁面  png.aspx

using System;using System.Collections.Generic;using System.Drawing;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;namespace Maticsoft.Web.Admin{    public partial class png : System.Web.UI.Page    {        protected void Page_Load(object sender, EventArgs e)        {            string checkCode = CreateRandomCode(4);            Session["CheckCode"] = checkCode;            CreateImage(checkCode);        }        private string CreateRandomCode(int codeCount)        {            // 函數功能:產生數字和字元混合的隨機字串                    string allChar = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";            char[] allCharArray = allChar.ToCharArray();            string randomCode = "";            Random rand = new Random();            for (int i = 0; i < codeCount; i++)            {                int r = rand.Next(61);                randomCode += allCharArray.GetValue(r);            }            return randomCode;        }        private void CreateImage(string checkCode)        {            // 產生圖象驗證碼函數               int iwidth = (int)(checkCode.Length * 11.5);            System.Drawing.Bitmap image = new System.Drawing.Bitmap(iwidth, 20);            Graphics g = Graphics.FromImage(image);            Font f = new System.Drawing.Font("Arial", 10, System.Drawing.FontStyle.Bold);            Brush b = new System.Drawing.SolidBrush(Color.Azure); //字母白色                    //g.FillRectangle(new System.Drawing.SolidBrush(Color.Blue),0,0,image.Width, image.Height);                   g.Clear(Color.Brown);//背景灰色                 g.DrawString(checkCode, f, b, 3, 3);            Pen blackPen = new Pen(Color.Black, 0);            Random rand = new Random();            System.IO.MemoryStream ms = new System.IO.MemoryStream();            image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);            Response.ClearContent();            Response.ContentType = "image/Jpeg";            Response.BinaryWrite(ms.ToArray());            g.Dispose();            image.Dispose();        }    }}

 

登入頁面放入圖片

<asp:Image ID="Image1" runat="server" ImageUrl="png.aspx" onclick="refresh(this, ‘png.aspx‘);"/>

js指令碼

        function refresh()
        {
            var url = "png.aspx?id=";
            var r = Math.random() * 1000;
            url = url + r;
            document.all("Image1").src = url;
            document.all("LoI_txtVC").value = "";
            document.all("LoI_txtVC").focus();
            return false;
        }</script>

 

登入判斷驗證碼  TextBox3為驗證碼輸入框

if (base.Session["CheckCode"] == null)            {                Page.ClientScript.RegisterStartupScript(Page.ClientScript.GetType(), "myscripts", "<script>alert(\"驗證碼已到期！\");</script>");                return;            }            if (TextBox3.Text != Session["CheckCode"].ToString())            {                Page.ClientScript.RegisterStartupScript(Page.ClientScript.GetType(), "myscripts", "<script>alert(\"驗證碼不正確！\");</script>");                return;            }

 

C#登入頁面驗證碼重新整理