Linq 组和聚合

Question

我正在尝试为以下 TSQL 创建 LINQ 查询：

SELECT [TenantID]
  ,[ABC]
  ,COUNT(*) [TotalSKU], SUM([QtyOnHand]) AS [SOH],SUM([QtyOnHand]*[Price]) AS [SOH_Value]
  ,SUM ([QtyOnOrder]) AS SOO
  ,SUM ([QtyOnOrder]*[Price]) AS [SOO_Value]
  FROM [OMS_StockStatus] GROUP BY  [TenantID], [ABC]

到目前为止我做到了：

 var res = from a in db.OMS_StockStatus
                      group a by new { a.TenantID, a.ABC } into g
                      select new ABCDashboard { TenantID = g.Key.TenantID, ABC = g.Key.ABC, TotalSKU = g.Count(),
                      SOH =  g.Sum( t => t.QtyOnHand), SOH_Value = g.Aggregate((c,d) => decimal(c.QtyOnHand) * d.Price)};

但出现以下错误：

'System.Linq.IGrouping' does not contain a definition for 'Aggregate' and the best extension method overload 'System.Linq.Enumerable.Aggregate(System.Collections.Generic.IEnumerable, System.Func)' has some invalid arguments

这是我的实体定义：

    public partial class ABCDashboard
{
    public short TenantID { get; set; }
    public string ABC { get; set; }
    public double TotalSKU { get; set; }
    public Nullable<double> SOH { get; set; }
    public Nullable<decimal> SOH_Value { get; set; }
    public Nullable<double> SOO { get; set; }
    public Nullable<decimal> SOO_Value { get; set; }
}

在OMS_StockStatus中，QtyOnHand是双倍的？价格翻倍？

Answer 1

用 .. SOH_Value = g.Sum(t => ((decimal)t.QtyOnHand) * t.Price)

Linq 组和聚合

Linq Group and Aggregate

c#

linq

entity-framework-5