/// <summary>
/// Returns the number of all elements.
/// </summary>
/// <typeparam name="T">The entity type.</typeparam>
/// <param name="queryable">The queryable.</param>
/// <returns></returns>
public static int Count <T>(this ISpecificationQueryable <T> queryable)
{
return(queryable.Count(Identity <T>()));
}
/// <summary>
/// Returns the number of elements satisfying a given predicate.
/// </summary>
/// <typeparam name="T">The entity type.</typeparam>
/// <param name="queryable">The queryable.</param>
/// <param name="predicate">The predicate to filter the elements.</param>
/// <returns></returns>
public static int Count <T>(this ISpecificationQueryable <T> queryable,
Expression <Func <T, bool> > predicate)
{
return(queryable.Count(Relay <T, T>(q => q.Where(predicate))));
}