c# - 无法将类型为 'NHibernate.Hql.Ast.HqlCast' 的对象转换为类型“NHibernate.Hql.Ast.HqlBooleanExpression”

Question

我正在使用以下 C# 代码:

public IList<T> GetAllByExpression(Expression<Func<T, bool>> expression, int startIndex, int count, Func<T, DateTime> dateTimeSelector)
{
    using (ISession session = NHibernateHelper.GetSession())
    {
        return session.Query<T>()
            .Where(expression)
            .OrderBy(dateTimeSelector)
            .Skip(startIndex - 1)
            .Take(count)
            .ToList();
    }
}

更新:甚至下面的代码也会抛出相同的异常:

public IList<T> GetAllByExpression(Expression<Func<T, bool>> expression, int startIndex, int count, Expression<Func<T, DateTime>> dateTimeSelector)
{
    using (ISession session = NHibernateHelper.GetSession())
    {
        return session.Query<T>()
            .Where(expression)
            //.OrderBy(dateTimeSelector)
            //.Skip(startIndex - 1)
            //.Take(count)
            .ToList();
    }
}

并得到 Nh 错误:

Unable to cast object of type 'NHibernate.Hql.Ast.HqlCast' to type 'NHibernate.Hql.Ast.HqlBooleanExpression'.

我做错了什么？

Answer 1

问题是我在表达式中写了短条件:as ((a == null)? true : a > b) NH casting fails on that (?)