/// <summary>
/// Get the values for all the specified keys, if they are in the
/// cache.
/// </summary>
/// <remarks>
/// <p>
/// For each key that is in the cache, that key and its corresponding
/// value will be placed in the dictionary that is returned by this
/// method. The absence of a key in the returned dictionary indicates
/// that it was not in the cache, which may imply (for caches that
/// can load behind the scenes) that the requested data could not be
/// loaded.</p>
/// <p>
/// The result of this method is defined to be semantically the same
/// as the following implementation, without regards to threading
/// issues:</p>
/// <pre>
/// IDictionary dict = new AnyDictionary();
/// // could be a Hashtable (but does not have to)
/// foreach (object key in colKeys)
/// {
/// object value = this[key];
/// if (value != null || Contains(key))
/// {
/// dict[key] = value;
/// }
/// }
/// return dict;
/// </pre>
/// </remarks>
/// <param name="keys">
/// A collection of keys that may be in the named cache.
/// </param>
/// <returns>
/// A dictionary of keys to values for the specified keys passed in
/// <paramref name="keys"/>.
/// </returns>
public virtual IDictionary GetAll(ICollection keys)
{
return(NamedCache.GetAll(keys));
}
