/// <summary>
/// Extendable method: 数据源中是否任何一个元素都满足条件
/// </summary>
/// <typeparam name="TEntity">实体类型</typeparam>
/// <param name="source">数据源</param>
/// <param name="predicate">条件表达式</param>
/// <returns>数据源中是否任何一个元素都满足条件</returns>
private static bool Any <TEntity>(this IDbQuery <TEntity> source, Expression <Func <TEntity, bool> > predicate)
where TEntity : class
{
return(source.Count(predicate) > 0);
}