(转)NHibernate使用Criteria分页显示并返回记录总数

/// <summary>
/// 返回文章列表
/// </summary>
/// <param name="userId">文章Id</param>
///<param name="categoryId">分类 Id</param>
/// <param name="sortFiled">排序字段</param>
/// <param name="direction">排序方向</param>
/// <param name="currentPageIndex">当前页码</param>
/// <param name="pageSize">每页大小</param>
/// <param name="recordCount">返回记录总数</param>
/// <returns>IList列表</returns>
public IList Getarticles(int userId,int categoryId, string sortFiled,bool direction, int currentPageIndex, int pageSize, out int recordCount)
{
ICriteria criteria=DataAccess.Criteria( typeof( MovieUrl ) )
.Add( Expression.Eq("UserId",userId ) )
.Add( Expression.Eq( "CategoryId", categoryId ));

//获取记录总数
recordCount = Convert.ToInt32(criteria.SetProjection( Projections.Count(MovieUrl.__ID ))
.UniqueResult( ));
criteria.SetProjection( null );

//设置排序
criteria.AddOrder( new Order( sortField, direction) )

//设置分页
criteria.SetFirstResult( (currentPageIndex.Value-1) * pageSize.Value )
.SetMaxResults( pageSize.Value );
return criteria.List( );
}
上面代码关键 criteria.SetProjection( null );这一句，这样就可以不用手动组装返回记录总数的HQL语句，在利用Criteria返回记录总数后再利用同一个Criteria返回列表