NHibernate:将ICriteria转换为DetachedCriteria [英] NHibernate: Convert an ICriteria to a DetachedCriteria

问题描述

任何人都知道如何将ICriteria转换为DetachedCriteria.我需要使用以下子查询来使用现有的ICriteria:

Anyone know how to convert an ICriteria into a DetachedCriteria. I need to use an existing ICriteria as part of a subquery using:

.Add(Subqueries.PropertyIn("Name", myDetachedCriteriaSubquery))

有什么方法可以将ICriteria转换为DetachedCriteria.我会接受不"并提供可靠的参考.

Is there any way to convert an ICriteria to a DetachedCriteria. I will accept 'no' with a credible reference.

推荐答案

根据mattk的回答，您可以继承DetachedCriteria来访问其构造函数:

Following on from mattk's answer, you can inherit DetachedCriteria to access its constructors:

public class ConvertedDetachedCriteria : DetachedCriteria
{
    public ConvertedDetachedCriteria(ICriteria criteria) 
        : base((CriteriaImpl) criteria, criteria)
    {
        var impl = (CriteriaImpl) criteria;
        impl.Session = null;
    }
}

现在您可以编写如下代码:

Now you can write code like this:

var criteria = Session.CreateCriteria<Person>()
   .Add(Restrictions.Eq("Name", "John"));

var clonedDetachedCriteria = new ConvertedDetachedCriteria(criteria);

var newCriteria = Session.CreateCriteria<Person>()
    .SetProjection(Projections.SubQuery(clonedDetachedCriteria))
    .List<string>();

免责声明:我仅在NH 2中对此进行了最低限度的测试……不能保证它会起作用或有任何用途.

Disclaimer: I've only subject this to minimal testing in NH 2... no guarantees it will work or be of any use.

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