nhibernate儿童收集限制

我有以下课程：

public class Document
{
    public Document()
    {
        Descriptions = new List<Descriptions>();
    }

    public virtual int Id { get; set; }
    public virtual IList<DocumentDescription> Descriptions { get; set; }
}

public class DocumentDescription
{
    public virtual int DocumentId { get; set; }
    public virtual int LanguageId { get; set; }
}

我的问题是：

var query = Session.QueryOver<Document>().Where(x => x.Id.IsIn(documentIds)).List();

var query=Session.QueryOver（）.Where（x=>x.Id.IsIn（documentid））.List（）；

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我需要一个查询解决方案来限制几种语言的文档描述，这将在运行时得到。我不想得到一个文档的所有文档描述（只有少数文档）。是否可以为子集合设置筛选/限制？

因此，我了解如何向查询中添加附加的join子句：

DocumentDescription dd = null;
ICriterion criterion = Restrictions.On<DocumentDescription>(x => x.LanguageId).IsIn(languageIds.ToArray());

var query = Session.QueryOver<Document>().Where(x => x.Id.IsIn(documentIds));
query.Left.JoinQueryOver(x => x.Descriptions, () => dd, criterion);

DocumentDescription dd = null;
ICriterion criterion = Restrictions.On<DocumentDescription>(x => x.LanguageId).IsIn(languageIds.ToArray());

var query = Session.QueryOver<Document>().Where(x => x.Id.IsIn(documentIds));
query.Left.JoinQueryOver(x => x.Descriptions, () => dd, criterion);

SELECT * FROM tDocument
LEFT OUTER JOIN tDocumentDescription ON tDocumentDescription.DocumentId = tDocument.Id AND tDocumentDescription.LanguageId IN (@languageIds)
WHERE tDocument.Id IN (@documentIds)