集合分页投影nhibernate查询的总计结果

Question

我正在动态构建一个需要实现分页的nhibernate投影查询。喜欢的东西...

var projections = Projections.ProjectionList(); 
foreach (var p in projection.Projections) 
{ 
    IProjection newProjection = null; 
    switch (p.AggregateFunc) 
    { 
     case AggregateFuncTypeEnum.GroupProperty: 
      newProjection = Projections.GroupProperty(p.Path); 
      break; 
     case AggregateFuncTypeEnum.Sum: 
      newProjection = Projections.Sum(p.Path); 
      break; 
     default: 
      newProjection = Projections.Property(p.Path); 
      break; 
    } 
    projections.Add(newProjection, p.Name); 
} 
criteria.SetProjection(projections).SetResultTransformer(new AliasToBeanResultTransformer(projectionType)); 

我能得到前15分的结果，像这样

criteria.SetFirstResult(0); 
criteria.SetMaxResults(15); 
var results = criteria.List(); 

但我也需要发送另一个查询来获取的记录总数，但到目前为止，我已经失败弄清楚这一点。该投影仍然需要应用，即如果结果按'代码'分组并且'成本'之和那么100条记录可能返回20行，并且这是我感兴趣的20条。

我该如何获得将返回的记录总数？由于

Answer 1

也许这：

var rowcount = CriteriaTransformer.Clone(criteria); 

var goupprojections = Projections.ProjectionList(); 
var projections = Projections.ProjectionList(); 
foreach (var p in projection.Projections) 
{ 
    IProjection newProjection = null; 
    switch (p.AggregateFunc) 
    { 
     case AggregateFuncTypeEnum.GroupProperty: 
      newProjection = Projections.GroupProperty(p.Path); 
      goupprojections.Add(Projections.GroupProperty(p.Path), p.Name); 
      break; 
     case AggregateFuncTypeEnum.Sum: 
      newProjection = Projections.Sum(p.Path); 
      break; 
     default: 
      newProjection = Projections.Property(p.Path); 
      break; 
    } 
    projections.Add(newProjection, p.Name); 
} 
criteria.SetProjection(projections).SetResultTransformer(new AliasToBeanResultTransformer(projectionType)); 

if (goupprojections.Aliases.Length == 0) 
{ 
    rowcount.SetProjection(Projections.RowCount()) 
} 
else 
{ 
    rowcount.SetProjection(Projections.Count(goupprojections)) 
} 

var results = criteria.Future(); 
var count = rowcount.FutureValue<int>();