Asp.NET Caching

Question

I've implemented caching on a file (XML) which gets sent to the graphs controls to render it. However, I was told to implement caching in a way that can be easily switched on and off (meaning setting a value in web.config).

Is there a way I can turn caching on and off depending on a value in a web.config file? Thank you lots!

@oded the code you supplied doesn't fit in my scenario because I'd have to rewrite existing code for instance:

if(bool.parse(confi.... == "true"){
 if(Cache[x] == null){
  load the XML document and insert it into the Cache object }
 else{
 get the xml document from the Cache object. } }

else repeat myself by reloading the document from object.

I'm sure there's got to be a better solution to this.

You have to rewrite you code if you need to switch things on/off depending on config. There is no way to keep the code as is and make it depend on config. — Oded
– Oded, Commented Jun 6, 2011 at 8:51
Note: "Cache" is not the same as "Session". Both store objects, but Session is user-specific and Cache is application wide (=all users get the same value). — Hans Keﬆing
– Hans Keﬆing, Commented Jun 6, 2011 at 8:55
and what about the following: Response.AddCacheItemDependency("CachedXml"); if (isCacheEnable == true) { Response.Cache.SetCacheability(HttpCacheability.Public); } else if (isCacheEnable == false) { Response.Cache.SetCacheability(HttpCacheability.NoCache); } — Johan
– Johan, Commented Jun 6, 2011 at 9:02

Oded · Accepted Answer · 2011-06-06 07:46:23Z

3

Just check for a value of a key in the config file.

In appSettings section:

<add key="cacheXML" value="true" />

And in your code check this:

if(bool.Parse(ConfigurationManager.AppSettings["cacheXML"]))
{
  // use caching
}

Note: this will throw an exception if the key does not exist in the app settings.

Note2: You should abstract away the dependency on configuration, so you can test your code without needed a config file.

answered Jun 6, 2011 at 7:46

Oded

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Nathan · Accepted Answer · 2011-06-06 07:53:24Z

0

There is a documented way of creating caching profiles here - when your web.config contains the cache profiles you need, then make your pages use the profile by supplying the cacheprofile name to the @outputcache directive in the relevant pages.

edited Jun 6, 2011 at 7:53

answered Jun 6, 2011 at 7:47

Nathan

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4 Comments

Oded Over a year ago

He is talking about caching an XML file on the server - what has this to do with output caching?

Nathan Over a year ago

he's tagged it as asp.net, so presumably he's talking about caching the result... (at least I hope he is, that's the more efficient way to do things, no point re-processing the same xml over and over again!)

Johan Over a year ago

how can I disable the duration attribute? I the caching to be dependant on the XML file from which it gets its data?

Nathan Over a year ago

see CacheDependency (though I'm not sure if that can be configured from web.config) - msdn.microsoft.com/en-us/library/…

BitKFu · Accepted Answer · 2011-06-06 08:48:42Z

0

You could add an caching aspect to your business layer.

But that depends on how you implemented your business logic? Do you have a separate business layer and some kind of dependency injection (like Ninject) in place?

answered Jun 6, 2011 at 8:48

BitKFu

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2 Comments

BitKFu Over a year ago

So, @Oded solution is the best way to go.

BitKFu Over a year ago

If you would have a separated business layer you could easily add a caching layer to it ...

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