如何使用LINQ，NHibernate和uNHAddins进行分组和排序

Question

我们正在使用Oracle数据库构建WPF应用程序，同时使用NHibernate和uNHAddins扩展。在DataGrid中，我们试图从表中获取的值，这个查询LINQ：

return (from f in rFConsumption.GetAll() 
       let d = f.CounterDtm 
       where f.CounterDtm >= dataHoraInicio && f.CounterDtm <= dataHoraFim 
       group f by (d.Year - 2000) * 384 + d.Month * 32 + d.Day into g 
       select new RFConsumption 
       {      
        COGCounter1 = (g.Sum(f => f.COGCounter1)), 
        BFCounter1 = (g.Sum(f => f.BFCounter1)), 
        NatGasCounter1 = (g.Sum(f => f.NatGasCounter1)), 
        MixGasCounter1 = (g.Sum(f => f.MixGasCounter1)), 
        COGCounter2 = (g.Sum(f => f.COGCounter2)), 
        BFCounter2 = (g.Sum(f => f.BFCounter2)), 
        NatGasCounter2 = (g.Sum(f => f.NatGasCounter2)), 
        MixGasCounter2 = (g.Sum(f => f.MixGasCounter2)), 
        COGCounter3 = (g.Sum(f => f.COGCounter3)), 
        BFCounter3 = (g.Sum(f => f.BFCounter3)), 
        NatGasCounter3 = (g.Sum(f => f.NatGasCounter3)), 
        MixGasCounter3 = (g.Sum(f => f.MixGasCounter3)), 
       } 
       ).ToList<RFConsumption>(); 

所以，我的问题是：

如何我要通过使用组，秩序，使用NHibernate ;

如何使返回日期数据字段组指向该指定的组。

Answer 1

你可以用几种方法用NHibernate编写相同的查询，最有趣的一个对我来说确实是NHibernate QueryOver <>。 所以，如果您的查询工作正常的话，这个查询应该工作：

return Session.QueryOver<rFConsumption>() 
      .Where(fc => (fc.CounterDtm >= dataHoraInicio && fc.CounterDtm <= dataHoraFim)) 
      .SelectList(list => list 
       .SelectGroup(f => ((f.CounterDtm.Year - 2000) * 384 + f.CounterDtm.Month * 32 + f.CounterDtm.Day)) //use group by 
       .Select(exp => 
        new RFConsumption() //here you define the return data type based on your specified group 
        { 
         // exp[0] represents the data returned and grouped by the above statements, so here you can reform it to fit into the form of your new entity 
         // exp[0] here will be equivilant to g in your query 
        }) 
        .OrderBy(ee => ee.COGCounter1) //order by any of the properties of RFConsumption 
        .ToList<RFConsumption>(); 

你应该先添加实体RFConsumption：

public calss RFConsumption 
{ 
    public int COGCounter1 { get; set; } 
    public int BFCounter { get; set; } 
    .... 
}