c# – Linq匿名类型成员必须在Sub Query中声明

我正在尝试将 this SQL查询转换为Linq,以在asp MVC中的View中返回,

Linq的预期产出：

TotalPoints Name

  231       John

我在第二个选择新的子查询中得到此错误：

Invalid expression term ‘.’

Invalid anonymous type member declarator. Anonymous type members must
be declared with a member assignment,simple name or member access.

Linq查询到目前为止：

public ActionResult UserTotal()
        {
            List<TotalPointsUser> onetotal = from t in (
    (from LoyaltyDetailsTable in dbpoints.LoyaltyDetailsTable
    where
      LoyaltyDetailsTable.CustomerTable.CustomerId == 1
    group new {LoyaltyDetailsTable.CustomerTable,LoyaltyDetailsTable.LoayaltyPointsTable} by new {
      LoyaltyDetailsTable.CustomerTable.Name,LoyaltyPointsId = LoyaltyDetailsTable.LoayaltyPointsTable.LoyaltyPointsId,Points = LoyaltyDetailsTable.LoayaltyPointsTable.Points,CustomerId = LoyaltyDetailsTable.CustomerTable.CustomerId
    } into g
    select new TotalPointsUser{
      CustomerId = 
      g.Key.LoyaltyPointsId == 4 ? 
        (from RedeemPointsTable in dbpoints.RedeemPointsTable
        where
          RedeemPointsTable.CustomerId == 1
        select new {
          RedeemPointsTable.Amount
        }).Count(p => p.Amount != null) : g.Count(p => p.CustomerTable.CustomerId != null),Name=g.Key.Name,Points = 
      g.Key.LoyaltyPointsId == 4 ? (
        (from RedeemPointsTable in dbpoints.RedeemPointsTable
        where
         RedeemPointsTable.CustomerId == 1
        select new {
         RedeemPointsTable.Amount
        }).Sum(p => p.Amount) * g.Key.Points) : g.Sum(p => p.LoayaltyPointsTable.Points)
    }))
select new {
  CustomerId = t.Sum(p => p.CustomerId),// here is the error
  Points= t.Sum(p => p.Points),// and here
  Name = 
    ((from CustomerTable in dbpoints.CustomerTable
    where
      CustomerTable.CustomerId == 1
    select new {
      CustomerTable.Name
    }).First().Name)
}
           .ToList();
            return View(onetotal);
}

型号类：

public class TotalPointsUser
{
    public int CustomerId { get; set; }
    public string Name { get; set; }
    public int Points { get; set; }
}

我是linq的新手,我可以知道必须做出哪些改变？

Ant帮助会很棒.

解决方法

您的查询结构是：

from t in (
)
select new {
  Column1 = .Sum(p => p.TotalUserActions),// here is the error
  Column2 = .Sum(p => p.AllTotalPoints),// and here
}

您必须在结果中使用t别名,如下所示：

from t in (
)
select new {
  Column1 = t.Sum(p => p.TotalUserActions),Column2 = t.Sum(p => p.AllTotalPoints),}

但是,您必须在生成的查询中包含此类字段,现在不是这样.

我认为您应该在sql中编写查询并逐步将其传输到LINQ.现在它非常令人困惑并且产生错误.

更新：
你有错误,因为你的代码不包含这样的文件.什么应该包含字段TotalUserActions和AllTotalPoints？尝试对所有Points字段求和,但不能说TotalPserActions是什么：

from t in (
)
select new {
  Column1 = t.Sum(p => p.TotalUserActions),Column2 = t.Sum(p => p.Points),}