Scope of Cache

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ThatsIT.net.au

There are a few different ways to use cache in Asp.net.

What I want to know is what is the scope of these cache methods. what I mean
by scope is are are they cached for the one user or not.

if I use System.Web.HttpRuntime.Cache am I caching for all users who come to
the site?
Can I set a expiry for System.Web.HttpRuntime.Cache?
Should I use Application("variable") or has this been superseded?



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Hi
if I use System.Web.HttpRuntime.Cache am I caching for all users who come
to the site?
Click to expand...

Yes, exactly. Cache is global.
Can I set a expiry for System.Web.HttpRuntime.Cache?
Click to expand...

Yes, within Insert method when adding items to Cache
Should I use Application("variable") or has this been superseded?
Click to expand...

Cache supersedes Application since it has callback functionality (in case of
expiration), cache item priority for memory handling etc. Cache is much more
versatile than Application.
 
Cache is available for the duration of the app domain life time, that is, for
the life time of the web application. Also, it is not per-user basis.
 
Hi,
What is the scope of these cache methods.
Click to expand...
Scope is an application (AppDomain), so you can use it for all users of the
application (site).
if I use System.Web.HttpRuntime.Cache am I caching for all users who come
Click to expand...
to the site?
For this only site - yes (the current application).
Can I set a expiry for System.Web.HttpRuntime.Cache?
Click to expand...
Even priority:
http://msdn2.microsoft.com/en-us/library/system.web.caching.cache.add.aspx
Should I use Application("variable") or has this been superseded?
Click to expand...
Cache has self-clearance and dependencies ability, Application doesn't have
it (more persisted). Select based upon these features.

Regards, Alex
[TechBlog] http://devkids.blogspot.com
 
ThatsIT.net.au said:
There are a few different ways to use cache in Asp.net.
Click to expand...

Indeed there are!
What I want to know is what is the scope of these cache methods. what I
mean by scope is are are they cached for the one user or not.
Click to expand...

Cache is a global object - like the application object, so its a shared
object. To use it for indivusdals you would need to be caching objects like
you would if you placed them in session - not a good idea really!
if I use System.Web.HttpRuntime.Cache am I caching for all users who come
to the site?
Click to expand...

Yes - while that application is in memory
Can I set a expiry for System.Web.HttpRuntime.Cache?
Click to expand...

Yes- refer to the docs at msdn
Should I use Application("variable") or has this been superseded?
Click to expand...

You can - cache is more flexible, but app is still available and still very
useful really! Your choice!

Regards

John Timney (MVP)
http://www.johntimney.com
http://www.johntimney.com/blog
 
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