/// <summary>
/// 取得指定类别下的列表
/// </summary>
/// <param name="parent_id">父ID</param>
/// <param name="nav_type">导航类别</param>
/// <returns>DataTable</returns>
public DataTable GetChildList(int parent_id, string nav_type)
{
return(dal.GetChildList(parent_id, nav_type));
}