如何將5種不同類型的linq查詢合併到一個列中

Question

我真的很困惑我需要的報告。截至今天，我的大部分報告都很簡單，所以我能夠輕鬆地做到這一點。但作爲在SQL/DLINQ一個新手，我無法通過以下找到我的方式：

var closingStock = 
    (from p in session.Query<Product>() 
    select new 
    { 
     p.Id, 
     p.Name, 
     p.Batch, 
     p.Rate, 
     ClosingStock = p.Quantity - p.AllocatedQuantity, 
     p.DivisionId 
    }).ToList(); 

var distributedQuantityAfterPeriod = 
    (from i in session.Query<OutwardInvoiceItem>() 
    where i.ParentInvoice.Date > ToDate 
    select new 
    { 
     Id = i.Product.Id, 
     DistributedAfter = i.Quantity 
    }).ToList(); 

var distributedQuantityInPeriod = 
    (from i in session.Query<OutwardInvoiceItem>() 
    where i.ParentInvoice.Date >= FromDate && i.ParentInvoice.Date <= ToDate 
    select new 
    { 
     Id = i.Product.Id, 
     Distributed = i.Quantity 
    }).ToList(); 

var receivedQuantityAfterPeriod = 
    (from i in session.Query<InwardInvoiceItem>() 
    where i.ParentInvoice.Date > ToDate 
    select new 
    { 
     Id = i.Product.Id, 
     ReceivedAfter = i.Quantity 
    }).ToList(); 

var receivedQuantityInPeriod = 
    (from i in session.Query<InwardInvoiceItem>() 
    where i.ParentInvoice.Date >= FromDate && i.ParentInvoice.Date <= ToDate 
    select new 
    { 
     Id = i.Product.Id, 
     Received = i.Quantity 
    }).ToList(); 

正如你所看到的，我想建立一個特定日期的庫存移動報告。我遇到以下問題：
1.如何減少五個查詢？可能嗎？
2.我該如何將這些查詢提供的數據合併到一個表中，該表按產品ID進行分組並彙總爲數量相關的列？到目前爲止，我正在使用非常慢的循環。

我用的是什麼：
C＃4，NHibernate的，SQLite的

任何幫助將非常高度讚賞。

Regards， Yogesh。

Answer 1

1. 減少往返使用.Future()代替.List()

2. 讓所有的查詢返回

   group i by i.Id into g 
   select new 
   { 
       Id = g.Key, 
       Quantity = g.Sum(x => x.Quantity) 
   }).Future(); 
   

，做

var alltogether = groupedDistributedQuantityAfterPeriod 
    .Concat(groupedDistributedQuantityInPeriod) 
    .Concate(...); 

from g in alltogether 
group g by g.key into all 
select new 
{ 
    Id = all.Key, 
    Quantity = all.Sum(x => x.Quantity) 
}; 

UPD吃：

可以減少查詢的數量與

from i in session.Query<OutwardInvoiceItem>() 
where (i.ParentInvoice.Date > ToDate) || (i.ParentInvoice.Date >= FromDate && i.ParentInvoice.Date <= ToDate) 
select ... 

from i in session.Query<InwardInvoiceItem>() 
where (i.ParentInvoice.Date > ToDate) || (i.ParentInvoice.Date >= FromDate && i.ParentInvoice.Date <= ToDate) 
select ...