Changing The OutputCache Provider During Runtime
I got a question in the post I wrote about
ASP.NET Output Cache Provider which asks
whether we can change the cache provider
The post will try to answer the question.
Overriding The OutputCache Provider
One of the changes in ASP.NET 4 is the ability to override the OutputCache provider name in the Global.asax file. This enables us to create logic that stores the OutputCache in more then one type of cache according to some state or behavior. When you do that you need to supply the name of the OutputCache provider by overriding the GetOutputCacheProviderName method. For example, I register the OutputCache provider from the previous post in the web.config but I don’t indicate that it is my default provider:
If I’ll run the application now the default OutputCache will be the ASP.NET supplied OutputCache. If I would like to override it then the following code which will be written in the Global.asax file will help me achieve it:
Pay attention that I return the provider name that was registered earlier in the configuration file. Also, I could have provided whatever behavior that I want in order to return my needed provider per some situation.
The scope of the GetOutputCacheProviderName method is per request which means that every request can get it’s own OutputCache provider.
Lets sum up, we can register more then one OutputCache provider to our application and decide according to some behavior when to use them. The way to achieve that is by overriding the GetOutputCacheProviderName method and returning the desired provider.