ImageCode.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;
using System.Drawing.Drawing2D;

public partial class ImageCode : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        Bitmap bmp = new Bitmap(50, 25);
        Graphics g = Graphics.FromImage(bmp);
        Random r = new Random();
        string code = r.Next(1000, 10000).ToString();
        Session["code"] = code;
        LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, 50, 25), getColor(), getColor(), 0f);
        g.DrawString(code, new Font("宋体", 16), brush, 0, 0);
        Response.ContentType = "image/jpeg";
        for (int i = 0; i < 150; i++)
        {
            bmp.SetPixel(r.Next(50), r.Next(25), getColor());
        }
        bmp.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);
    }
    private Color getColor()
    {
        Random r = new Random();
        return Color.FromArgb(r.Next(256), r.Next(256), r.Next(256));
    }
}