在nhibernate中使用条件创建查询时出现问题

我想使用条件重现以下查询：

select a.ID as article, count(c.ID) as commentsCount
from Comments c 
left outer join Articles a on a.ID=c.ArticleID 
where a.ID in (2,10)
group by a.ID

ICriteria criteria = Session.CreateCriteria<Comment>("c")  
                .CreateCriteria("Article", "a", 
                                NHibernate.SqlCommand.JoinType.LeftOuterJoin)
                .Add(Restrictions.In("a.ID", articleIDs))
                .SetProjection(Projections.Property("a.ID"))
                .SetProjection(Projections.Count("c.ID"))
                .SetProjection(Projections.GroupProperty("a.ID"));

SELECT   a1_.ID as y0_
FROM     Comments this_
         left outer join Articles a1_
           on this_.ArticleID = a1_.ID
WHERE    a1_.ID in (2 /* @p0 */,10 /* @p1 */)
GROUP BY a1_.ID

我写的，但在某个地方我一定有一个错误，因为结果与我预期的不同

标准如下：

select a.ID as article, count(c.ID) as commentsCount
from Comments c 
left outer join Articles a on a.ID=c.ArticleID 
where a.ID in (2,10)
group by a.ID

ICriteria criteria = Session.CreateCriteria<Comment>("c")  
                .CreateCriteria("Article", "a", 
                                NHibernate.SqlCommand.JoinType.LeftOuterJoin)
                .Add(Restrictions.In("a.ID", articleIDs))
                .SetProjection(Projections.Property("a.ID"))
                .SetProjection(Projections.Count("c.ID"))
                .SetProjection(Projections.GroupProperty("a.ID"));

SELECT   a1_.ID as y0_
FROM     Comments this_
         left outer join Articles a1_
           on this_.ArticleID = a1_.ID
WHERE    a1_.ID in (2 /* @p0 */,10 /* @p1 */)
GROUP BY a1_.ID

以及映射：

public class Comment : EntityBase<int>
{
        public virtual Article Article { set; get; }

}

public CommentMap()
        {
            Id(x => x.ID).GeneratedBy.Identity();        
            References(x => x.Article).Not.Nullable()
                                      .LazyLoad().Cascade
                                      .SaveUpdate().Column("ArticleID");
        }

公共类注释：EntityBase
{
公共虚拟项目{set；get；}
}
公共地图（）
{
Id（x=>x.Id）.GeneratedBy.Identity（）；
引用（x=>x.Article）.Not.Nullable（）
.LazyLoad（）.Cascade
.SaveUpdate（）.Column（“ArticleID”）；
}

每次使用

SetProjection

都会替换上一个

您需要使用：

.SetProjection(Projections.Property("a.ID"),
               Projections.Count("c.ID"),
               Projections.GroupProperty("a.ID"))

---

每次使用

SetProjection

都会替换上一个

您需要使用：

.SetProjection(Projections.Property("a.ID"),
               Projections.Count("c.ID"),
               Projections.GroupProperty("a.ID"))