Question

我有ForecastData的列表，它看起来像这样：

public class ForecastData
{
    public string SalesID {get;set;}
    public string Customer {get;set;}
    public string Vendor {get;set;}
    public string Division {get;set;}
    public int Year {get;set;}
    public decimal Amount {get;set;}
}

我需要显示每个“客户”的不同“SalesID”的列表，其中金额大于＆gt; 0这年是今年。

目前，我正在按客户分组，但因为我的数据集中的同一个Customer和SalesID可以有多个“Amounts”，所以我没有得到我期望的结果。我的结果显示：

Customer1 User1 $ 100
Customer1 User1 $ 200
Customer1 User1 $ 300
Customer1 User2 $ 100
Customer1 User2 $ 200

但我想要的是

Customer1 User1 $ 600
Customer1 User2 $ 300

这是我的表达：

var forecasts = (List<ForecastData>)cache.Get(_RAW_FORECAST_DATA_KEY, null);

foreach(var custGroup in forecasts.Where(f => f.Year == DateTime.Now.Year).GroupBy(f => f.Customer))
{
    if(custGroup.Count() > 1) // There's more than one forecast for this customer
    {
        foreach(var instance in custGroup)
        {
            toReturn.Add(new MultipleCustomer(custGroup.Key)
            {
                Salesperson = instance.SalesPersonId,
                Forecast = instance.Amount
            });
        }
    }
}

return toReturn;

Answer 1

我认为如果您更改查询以便拥有“外部”GroupBy和“内部”GroupBy，则可以解决您的问题：

var forecasts = (List<ForecastData>)cache.Get(_RAW_FORECAST_DATA_KEY, null);

var forecastGroups = forcasts
    .Where(f => f.Year = DateTime.Now.Year)
    .GroupBy(f => f.Customer)
    .Where(grp => grp.Count() > 1)
    .Select(grp => new { Key = grp.Key, SalesGroups = grp.GroupBy(f => f.SalesId) });

foreach(var custGroup in forecastGroups)
{
    if(custGroup.SalesGroups.Count() > 1)
    {
        foreach(var salesGroup in custGroup.SalesGroups)
        {
            toReturn.Add(new MultipleCustomer(custGroup.Key)
            {
                Salesperson = salesGroup.Key,
                Forecast = salesGroup.Sum(f => f.Amount)
            });
        }
    }
}

return toReturn;

Answer 2

尝试以下方法：

foreach(var custGroup in forecasts.Where(f => f.Year == DateTime.Now.Year).GroupBy(f => new { f.Customer, f.SalesPersonId }).Where(k => k.Count() > 1).Select(k => new { Customer = k.Key.Customer, SalesPersonId = k.Key.SalesPersonId, TotalAmount = k.Sum(x => x.Amount) } )
{
           toReturn.Add(new MultipleCustomer(custGroup.Customer)
           {
              Salesperson = custGroup.SalesPersonId,
              Forecast = custGroup.TotalAmount
           });
       }
   }
}

我一直在写我的头脑。附近没有C＃编译器，因此可能存在一些错误。

这里问题的关键在于你需要汇总你的金额总和。

无法使用LINQ表达式查找重复项

2 个答案: