SysManage/imgcode.aspx.cs

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using System;
using System.Drawing.Imaging;
using System.IO;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

public partial class SysManage_imgcode : System.Web.UI.Page
{
    string t = string.Empty;
    protected void Page_Load(object sender, EventArgs e)
    {
        t = Request.QueryString["t"];
        if (!IsPostBack)
        {
            string tmp = RndNum(4);
            //HttpCookie a = new HttpCookie("ImageV", tmp);
            //Response.Cookies.Add(a);
            this.ValidateCode(tmp);
        }
    }

    private void ValidateCode(string VNum)
    {
        Bitmap Img = null;
        Graphics g = null;
        MemoryStream ms = null;

        int gheight = VNum.Length * 12;
        Img = new Bitmap(gheight, 19);
        g = Graphics.FromImage(Img);
        //背景颜色
        g.Clear(Color.White);
        //文字字体
        Font f = new Font("Arial", 11);
        //文字颜色
        Color strclr;
        strclr = GetColor(0);
        SolidBrush s = new SolidBrush(strclr);
        g.DrawString(VNum, f, s, 3, 3);
        ms = new MemoryStream();
        Img.Save(ms, ImageFormat.Jpeg);
        Response.ClearContent();
        Response.ContentType = "image/Jpeg";
        Response.BinaryWrite(ms.ToArray());

        g.Dispose();
        Img.Dispose();
        Response.End();
    }
    private Color GetColor(int itemIndex)
    {
        Color color;
        switch (itemIndex)
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