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.
Changes in Web.Config File:
<caching>
<outputCache>
<providers>
<add name="InMemory" type="InMemoryOutputCacheProvider"/>
</providers>
</outputCache>
</caching>
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:
public class Global : System.Web.HttpApplication
{
public override string GetOutputCacheProviderName(HttpContext context)
{
return "InMemory";
}
protected void Application_Start(object sender, EventArgs e)
{
}
protected void Session_Start(object sender, EventArgs e)
{
}
protected void Application_BeginRequest(object sender, EventArgs e)
{
}
protected void Application_AuthenticateRequest(object sender, EventArgs e)
{
}
protected void Application_Error(object sender, EventArgs e)
{
}
protected void Session_End(object sender, EventArgs e)
{
}
protected void Application_End(object sender, EventArgs e)
{
}
}
Pay attention: 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.
