What's wrong with HttpContext in an HttpHandler?
I experimented some more with
the problem I posted recently regarding setting Session values from an HttpHandler. Instead of using Session, I tried using the Cache object instead. The same thing happened... worked fine in Visual Studio, but not in IIS on the server. Here's the class... the value of Session["spamimage"] doesn't update after the first try (called from an <img src="AntiSpamimage.ashx"> tag), even though the image clearly is regenerated. Again, this works fine in the context of the built-in VS server.
using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Text;
using System.Web;
using System.Web.SessionState;
public class AntiSpamImage : IHttpHandler, IRequiresSessionState
{
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "image/gif";
Bitmap b = new Bitmap(200, 60);
Graphics g = Graphics.FromImage(b);
g.FillRectangle(new SolidBrush(Color.White), 0, 0, 200, 60);
Font font = new Font(FontFamily.GenericSerif, 48, FontStyle.Bold,
GraphicsUnit.Pixel);
Random r = new Random();
string letters = "ABCDEFGHIJKLMNPQRSTUVWXYZ";
string letter;
StringBuilder s = new StringBuilder();
for (int x = 0; x < 5; x++)
{
letter = letters.Substring(r.Next(0, letters.Length - 1), 1);
s.Append(letter);
g.DrawString(letter, font, new SolidBrush(Color.Black), x * 38, r.Next(0, 15));
}
context.Session["antispamimage"] = s.ToString();
Pen linePen = new Pen(new SolidBrush(Color.Black), 2);
for (int x = 0; x < 6; x++)
g.DrawLine(linePen, new Point(r.Next(0, 199), r.Next(0, 59)), new Point(r.Next(0, 199), r.Next(0, 59)));
b.Save(context.Response.OutputStream, ImageFormat.Gif);
}
public bool IsReusable
{
get { return true; }
}
}