/// <summary>
/// 取得所有类别列表(没有排序好，只有数据)
/// </summary>
/// <param name="parent_id">父ID，0为所有类别</param>
/// <param name="nav_type">导航类别</param>
/// <returns>DataTable</returns>
public DataTable GetDataList(int parent_id, string nav_type)
{
return(dal.GetDataList(parent_id, nav_type));
}