vpic.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.Drawing;

public partial class vpic : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        #region 生成验证码
        if (Session.Contents["vpic"] == null)
            Session.Add("vpic", null);
        Random rand = new Random();
        string vaildate = rand.Next(100, 1000).ToString();
        Session.Contents["vpic"] = vaildate;
        System.Drawing.Image image = new System.Drawing.Bitmap(30, 16);
        System.Drawing.Graphics formGraphice = System.Drawing.Graphics.FromImage(image);
        System.Drawing.Font font = new System.Drawing.Font("Arial", 10, FontStyle.Regular);
        System.Drawing.SolidBrush brush = new System.Drawing.SolidBrush(System.Drawing.Color.Black);
        formGraphice.Clear(System.Drawing.Color.White);
        System.Drawing.StringFormat format = new System.Drawing.StringFormat();

        int x1, x2, y1, y2;
        Random random = new Random();
        //画图片的背景噪音线
        x1 = random.Next(image.Width);
        x2 = random.Next(image.Width);
        y1 = random.Next(image.Height);
        y2 = random.Next(image.Height);
        formGraphice.DrawLine(new Pen(Color.Black), x1, y1, x2, y2);
        x1 = random.Next(image.Width);
        x2 = random.Next(image.Width);
        y1 = random.Next(image.Height);
        y2 = random.Next(image.Height);
        formGraphice.DrawLine(new Pen(Color.Gray), x1, y1, x2, y2);

        formGraphice.DrawString(vaildate, font, brush, 0, 00, format);
        font.Dispose();
        brush.Dispose();
        formGraphice.Dispose();
        image.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);
        #endregion
    }
}