Exclude certain entities from second-level caching - entity-framework

Question

I'm using EFCache to provide 2nd-level caching in my EF context.
I ran into a problem, where one of my entities is connected to a view which provides row-level security. So this view filters rows based on some parameters. When using 2nd-level cache, all users will get the same result!
I'm looking for a way to exclude certain entities from caching, any help is welcome.
This is my caching configuration:
class CacheConfiguration : DbConfiguration
{
public CacheConfiguration()
{
var transactionHandler = new CacheTransactionHandler(new InMemoryCache());
AddInterceptor(transactionHandler);
var cachingpolicy = new cachingpolicy();
Loaded +=
(sender, e) => e.ReplaceService<DbProviderServices>(
(s, _) => new CachingProviderServices(s, transactionHandler, cachingPolicy));
}
}

Answer 1

I found the answer in this blog post.
In order to exclude some entities, you need to create a caching policy and drive a class from CachingPolicy.
After overriding CanBeCached method, you can return false to prevent caching.
This is my working code:
class CacheConfiguration : DbConfiguration
{
public CacheConfiguration()
{
var transactionHandler = new CacheTransactionHandler(new InMemoryCache());
AddInterceptor(transactionHandler);
//var cachingPolicy = new CachingPolicy();
var cachingPolicy = new myCachingPolicy();
Loaded +=
(sender, e) => e.ReplaceService<DbProviderServices>(
(s, _) => new CachingProviderServices(s, transactionHandler, cachingPolicy));
}
}
public class myCachingPolicy : CachingPolicy
{
protected override bool CanBeCached(System.Collections.ObjectModel.ReadOnlyCollection<System.Data.Entity.Core.Metadata.Edm.EntitySetBase> affectedEntitySets, string sql, IEnumerable<KeyValuePair<string, object>> parameters)
{
string[] excludedEntities = {
"permView1",
"permView2",
"permView3"};
if (affectedEntitySets.Where(x => excludedEntities.Contains(x.Table)).Any())
{
return false;
}
else
{
return base.CanBeCached(affectedEntitySets, sql, parameters);
}
}
}