从nhibernate Criteria api到linq的查询

Question

我想将以下查询从nhibernate条件查询api转换为linq。

 var userquery = session.CreateCriteria(typeof(User))
          .SetFirstResult(pageIndex * pageSize)
          .SetMaxResults(pageSize);

 var totalcountQuery = CriteriaTransformer.Clone(userquery)
           .SetProjection(Projections.RowCountInt64());

谢谢

更新资料

IEnumerable<User> dbUsers = userquery.Future<User>();
IFutureValue<long> count = totalcountQuery.FutureValue<long>();

Answer 1

直接翻译成：

var userQuery = session.Query<User>().Skip(pageIndex * pageSize).Take(pageSize);

var totalCount = userQuery.LongCount();

但是，我不确定您为什么要在“跳过并获取”之后进行计数，我会认为：

var totalCount = session.Query<User>().LongCount(); 

会更接近您想要的

参见http://blogs.planetcloud.co.uk/mygreatdiscovery/post/Executing-future-queries-with-NHibernate-Linq.aspx

对于Linq上的期货，您可以执行以下操作：

var users = userQuery.ToFuture();    
var totalCount = userQuery.LongCount(); // users will be a future, count won't be but if it's only 2 queries then this will execute them both