/// <summary>
/// 获取群组成员
/// </summary>
/// <param name="groupId">群组Id</param>
/// <param name="hasManager">是否包含管理员</param>
/// <param name="sortBy">排序字段</param>
/// <param name="pageSize">每页记录数</param>
/// <param name="pageIndex">页码</param>
/// <returns>群组成员分页数据</returns>
public PagingDataSet <GroupMember> GetGroupMembers(long groupId, bool hasManager = true, SortBy_GroupMember sortBy = SortBy_GroupMember.DateCreated_Asc, int pageSize = 20, int pageIndex = 1)
{
//设计要点：
//1、排序：管理员排在前，其余按加入时间正序；
//2、使用分区列表缓存
return(groupMemberRepository.GetGroupMembers(groupId, hasManager, sortBy, pageSize, pageIndex));
}
