Get List Of Keys In Cache - Use Default Name Region?

I am trying to convert a solution using EntLib into using AppFabric caching. By help of a few extension methods this is a fairly pain-free process.

Extension methods I use:
public static bool Contains(this DataCache dataCache, string key)
{
return dataCache.Get(key) != null;
}
public static object GetData(this DataCache dataCache, string key)
{
return dataCache.Get(key);
}

But there are two features of EntLib I find difficult to convert. Namely "Count" (counting number of keys in cache) and "Flush" (removing all data from cache). Both could be solved if I could iterate the keys in cache. There is a method called ClearRegion(string region), but that required me to specify a region name on all Get/Put/Add-methods I use, which would require some manual error-prone work.

Is there any way to get a list of keys in cache?
Is there a default region name I can use?
How can I flush the cache when I haven't used a region name?