Question

我是根据股票交易计算库存但是我想排除那些发票没有标记为 IsStocked 这是Nullable布尔值的股票交易，我试图通过使用 SkipWhile实现这一点哪个无效，无论发票 IsStocked 属性是真还是假，它都只统计所有交易：

以下是我的尝试：

For i = LBound(SheetPosition) To UBound(SheetPosition)
    For j = LBound(Position) To UBound(Position)
        For k = LBound(Direction) To UBound(Direction)
            For l = LBound(Temper) To UBound(Temper)
                MsgBox i
                MsgBox SheetPosition(i)
                MsgBox j
                MsgBox Position(j)
                MsgBox k
                MsgBox Direction(k)
                MsgBox l
                MsgBox Temper(l)
            Next
        Next
    Next
Next

Answer 1

您可以尝试 Where 子句。

    public double GetInStockQuantity(Warehouse warehouse, Entities db)
    {
        double res;
        try
        {
            res = db.Stocks.AsNoTracking().Where(c => c.Product.ID == ID &&       c.WarehouseID == warehouse.ID).
            AsNoTracking().AsEnumerable().
            Where(c => c.InvoiceItems.Any(q => q.Invoice.IsStocked == true)).Sum(q => q.Quantity);
        }
        catch (Exception)
        {
           res = 0;
        }
          return res;
   }

C＃Linq To Entities（SkipWhile不工作）

1 个答案: