Question

我有一份清单如下

    var left = (from T in brndT
        join S in brndS
        on T.ID equals S.ID
        into temp
        from S in temp.DefaultIfEmpty()
        select new BrandSalesTarget
        {
             ID = T.ID,
             Target = T.Target == null ? 0 : (int)T.Target,
             Sales = S != null ? (int)S.Qty : 0
        }).ToList();
   listOfList.Add(left);

现在我想要ID, TotalTarget, TotalSales 这意味着按列表列出ID, Sum(target), Sum(sales)。怎么做？

Answer 1

听起来你想要这样的东西：

var result = 
    from list in listOfList
    from T in list
    group T by T.ID into g
    select new // possibly select new BrandSalesTarget
    {
        ID = g.Key,
        Target = g.Sum(t => t.Target),
        Sales = g.Sum(t => t.Sales)
    };

然而，似乎更好的解决方案可能是重构您的代码，以便您可以直接派生此结果，而不是处理List<List<BrandSalesTarget>>，但没有看到完整的上下文，很难说这看起来如何

列表组结果列表

1 个答案: