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]

Re: IHttpHandler and Caching

Hi Andrew,

In the future you may get better responses if you post ASP.NET questions to
the microsoft.publi c.dotnet.framew ork.aspnet newsgroup.

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

public Bitmap YourImage
{
get
{
if (Cache["YourImageK ey"] == null)
Cache["YourImageK ey"] = GenerateYourIma ge();

return (Bitmap) Cache["YourImageK ey"];
}
}

"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 (HttpCacheabili ty.Public);

"How To: Set a Page's Cacheability Programmaticall y"

http://msdn2.microsoft.com/en-us/library/z852zf6b.aspx

--
Dave Sexton

"Andrew" <infoREMOVE@THI Smuonlab.comwro te in message
news:kIlah.2722 5$hK2.12543@new sfe3-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