集合分頁投影nhibernate查詢的總計結果

Question

我正在動態構建一個需要實現分頁的nhibernate投影查詢。喜歡的東西...

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分的結果，像這樣

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

但我也需要發送另一個查詢來獲取的記錄總數，但到目前爲止，我已經失敗弄清楚這一點。該投影仍然需要應用，即如果結果按'代碼'分組並且'成本'之和那麼100條記錄可能返回20行，並且這是我感興趣的20條。

我該如何獲得將返回的記錄總數？由於

Answer 1

也許這：

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>();