如何遍历列表中匿名类型的属性

Question

如果我有以下 LINQ 查询：

 var outstandingDataTotalData = from t1 in dtTotal.AsEnumerable()
                                                  join t2 in dtOutstandingData.AsEnumerable() on
                                                   new
                                                   {
                                                       priv_code = t1["priv_code"],
                                                       pri_ded = t1["pri_ded"].ToString().Trim()
                               
                                                   } equals
                                                     new
                                                     {
                                                         priv_code = t2["priv_code"],
                                                         pri_ded = t2["pri_ded"].ToString().Trim()
               
                                                     }
                                                   into ps
                                                   from t2 in ps.DefaultIfEmpty()
                                                   select new
                                                   {
                                                       adjustment_value = t2 == null ? string.Empty : t2["adjustment_value"].ToString(),
                                                       amount_outstanding = t2 == null ? string.Empty : t2["amount_outstanding"].ToString(),
                                                       amount_outstanding_priv = t2 == null ? string.Empty : t2["amount_outstanding_priv"].ToString(),
                                                       amount_outstanding_ded = t2 == null ? string.Empty : t2["amount_outstanding_ded"].ToString(),
                                                       diff_outstanding = t2 == null ? string.Empty : t2["diff_outstanding"].ToString(),
                                                       exchange_rate = t2 == null ? string.Empty : t2["exchange_rate"].ToString(),
                                                       SalYear = t2 == null ? string.Empty : t2["sal_year"].ToString(),
                                                       SalMonth = t2 == null ? string.Empty : t2["sal_mon"].ToString()
                                                   };

---

现在outstandingDataTotalData是一个匿名类型的列表。 我有以下 class：

 public class AdjustmentTotal
    {
        public string SalYear { get; set; }

        public string SalMonth { get; set; }

        public string Value { get; set; }
    }

如何遍历outstandingDataTotalData属性以填充List<AdjustmentTotal> ，如下例所示：

如果outstandingDataTotalData总数据的结果集 =

[0]{ adjustment_value = "100.00", amount_outstanding = "80.00", amount_outstanding_priv = "60.00", amount_outstanding_ded = "30.52", diff_outstanding = "0.36", exchange_rate = "", SalYear = "2018", SalMonth = "1" }

[1]{ adjustment_value = "1500.00", amount_outstanding = "5040.00", amount_outstanding_priv = "", amount_outstanding_ded = "", diff_outstanding = "0.36", exchange_rate = "", SalYear = "2018", SalMonth = "1" }

我希望List<AdjustmentTotal>的结果集为：

2018  1   100.00
2018  1   1500.00
2018  1   80.00
2018  1   5040.00
2018  1   60.00
2018  1   
2018  1   30.52
2018  1   
2018  1   0.36
2018  1   0.36
2018  1
2018  1   

Answer 1

outstandingDataTotalData.Select(s => new AdjustmentTotal {
    SalYear = s.SalYear,
    SalMonth = s.SalMonth,
    Value = s.adjustment_value
}).ToList();

Answer 2

让您的生活变得轻松，不要提取到单独的属性。 将提取物设为数组：

select new {
  someArray = new[]{
    t2["adjustment_value"].ToString(),
    t2["amount_outstanding"].ToString(),       
    t2["amount_outstanding_priv"].ToString(),
    t2["amount_outstanding_ded"].ToString(),
    ...
  },
  SalYear = ...,

}

所以你最终得到一个 object 有 3 个属性，两个字符串 SalXxx 和一个字符串数组（其他值）。 字符串数组意味着您可以使用 LINQ SelectMany将其展平。 您将在 msdn 示例中看到，他们的所有者拥有宠物列表（宠物数量可变，但您的值是固定数量），并且在 selectmany 之后，它被展平为所有者重复且只有一只宠物的列表。 您的小写值是宠物，SalXxx 值是所有者

获得有效查询后，您实际上可以将其集成到第一个查询中。

抱歉没有发布一个完整的例子（为了清楚起见，我跳过了 null 检查）——代码很难在手机上使用

---

编辑：

所以，你说你想要特定顺序的结果。 Select 和 SelectMany 都有一个版本，它们将提供项目的索引，我们可以使用它..因为您基本上想要拥有这些对象：

var obj = new [] { 
        new { SalYear = 2018, SalMonth = 1, C = new[] { "av1", "ao1", "aop1", "aod1" } }, 
        new { SalYear = 2018, SalMonth = 2, C = new[] { "av2", "ao2", "aop2", "aod2" } }
    };

就像av1, av2, ao1, ao2..所以我们要先按内部数组的索引对结果进行排序，然后再按外部数组的索引

我们使用 SelectMany 挖掘内部数组，然后为内部数组中的每个项目创建一个新的 object ，其中包含数据和索引（内部和外部）：

obj.SelectMany((theOuter, outerIdx) =>
  theOuter.C.Select((theInner, innerIdx) => 
    new { 
      SalYear = theOuter.SalYear, 
      SalMonth = theOuter.SalMonth, 
      DataItem = theInner, 
      OuterIdx = outerIdx,
      InnerIdx = innerIdx
    }
  )
).OrderBy(newObj => newObj.InnerIdx).ThenBy(newObj => newObj.OuterIdx)

您可能会发现您不需要 ThenBy； 按 InnerIdx 排序会留下一个平局（我列表中的每个 InnerIdx 都表示两次 - 有两个 innerIdx=0 等），linq 中的东西尽可能地排序 - 因为它们已经按 OuterIdx 排序了（当他们去的时候进入查询）它们应该在与 InnerIdx 绑定后保持按 OuterIdx 排序。如果这是有道理的。 腰带和牙套！

Answer 3

使用 eum：

    class Program
    {

        static void Main(string[] args)
        {


            List<AdjustmentTotal> totals = new List<AdjustmentTotal>();
            for (int i = 0; i < (int)VALUE.END; i++)
            {
                foreach (var data in outstandingDataTotalData)
                {
                    AdjustmentTotal total = new AdjustmentTotal();
                    totals.Add(total);
                    total.SalMonth = data.SalMonth;
                    total.SalYear = data.SalYear;
                    total._Type = (VALUE)i;
                    switch ((VALUE)i)
                    {
                        case VALUE.adjustment_value :
                            total.Value = data.adjustment_value;
                            break;
                        case VALUE.amount_outstanding:
                            total.Value = data.amount_outstanding;
                            break;
                        case VALUE.amount_outstanding_ded:
                            total.Value = data.mount_outstanding_ded;
                            break;
                        case VALUE.amount_outstanding_priv:
                            total.Value = data.amount_outstanding_priv;
                            break;
                        case VALUE.diff_outstanding:
                            total.Value = data.diff_outstanding;
                            break;
                        case VALUE.exchange_rate:
                            total.Value = data.exchange_rate;
                            break;
                    }
                }
            }
        }
    }
    public enum VALUE
    {
        adjustment_value = 0, 
        amount_outstanding = 1, 
        amount_outstanding_priv = 2, 
        amount_outstanding_ded = 3, 
        diff_outstanding = 4, 
        exchange_rate = 5,
        END = 6
    }    
    public class AdjustmentTotal
    {
        public string SalYear { get; set; }

        public string SalMonth { get; set; }

        public string Value { get; set; }

        public VALUE _Type { get; set; }
    }