Gif.aspx.cs

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

public partial class Gif : WebPage
{
    protected void Page_Load(object sender, EventArgs e)
    {
        int intVNum = int.Parse(this.GetRand(1000, 9999));
        this.Session["VNum"] = intVNum.ToString();
        this.ValidateCode(intVNum);
    }

    /// <summary>
    /// 函数ValidateCode | 生成验证码
    /// </summary>
    /// <param name="VNum">验证码数字</param>
    private void ValidateCode(int VNum)
    {
        Bitmap Img;
        Graphics g;
        MemoryStream ms = new MemoryStream();
        int gheight = 46;
        Img = new Bitmap(gheight, 20);
        g = Graphics.FromImage(Img);
        g.DrawString(VNum.ToString(), (new Font("Arial", 10)), (new SolidBrush(Color.Blue)), 3, 3);
        Img.Save(ms, ImageFormat.Png);
        Response.ClearContent();
        Response.ContentType = "image/Png";
        Response.BinaryWrite(ms.ToArray());
        g.Dispose();
        Img.Dispose();
        Response.End();
    }
}