IHttpHandler and Caching

[Andrew]

Hi,

Ive got a .ashx file which produces an image (useage: <img
src="myHandler.ashx" />)

What do I need to do to make it cache? Every time my page reloads it
recreates the image (a slow process), and i have a lot of these per page.

The image-producing code doesn't NEED to be in a handler (in case anyone
has a better suggestion)

Thanks
Andrew

[Dave Sexton]

Hi Andrew,

In the future you may get better responses if you post ASP.NET questions to
the microsoft.public.dotnet.framework.aspnet newsgroup.

If you're generating the image on-the-fly then you can cache the result
programmatically:

public Bitmap YourImage
{
get
{
if (Cache["YourImageKey"] == null)
Cache["YourImageKey"] = GenerateYourImage();

return (Bitmap) Cache["YourImageKey"];
}
}

"Caching Application Data"
http://msdn2.microsoft.com/en-us/library/6hbbsfk6.aspx

To allow IIS, proxy servers and the user agent (web browser) to cache the
request output you can use the following code, for example:

Response.Cache.SetCacheability(HttpCacheability.Pu blic);

"How To: Set a Page's Cacheability Programmatically"
http://msdn2.microsoft.com/en-us/library/z852zf6b.aspx

--
Dave Sexton

"Andrew" <in********@THISmuonlab.comwrote in message
news:kI*******************@newsfe3-win.ntli.net...

Hi,

Ive got a .ashx file which produces an image (useage: <img
src="myHandler.ashx" />)

What do I need to do to make it cache? Every time my page reloads it
recreates the image (a slow process), and i have a lot of these per page.

The image-producing code doesn't NEED to be in a handler (in case anyone
has a better suggestion)

Thanks
Andrew