Question

我有以下对象：

countDictionary As Dictionary(of Category, Dictionary(of Date, Integer))

Class有一个枚举属性。出于演示的目的，我将其称为MasterCategory。

我一直试图找出一个如下所示的对象：

groupedCountDictionary As Dictionary(of MasterCategory, Dictionary(of Date, Integer)

我能得到的最好结果是：

Lookup(of MasterCategory, Dictionary(of Date, Integer))

自：

countDictionary.ToLookup(Function(o) o.Key.MasterCategory, Function(o) o.Value)

每个IEnumerable (Of Dictionary(of Date, Integer))值会产生MasterCategory。

但是，我需要将IEnumerable of Dictionary 扁平化为一个字典，每个日期的所有整数相加（总计数）。

然后我尝试使用各种select和group by s（来自众多stackoverflow帖子）来“压扁”它，但我的努力不足。

有人可以建议一种方法吗？如果可能，寻找 VB.Net 答案。

修改

当前代码

[Category Class]
-    MasterCategory As Enum
-    Name As String etc

[countDictionary As Dictionary(of Category Objects, Dictionary(of Date, Integer))]
-    length 8
-    Children of 8 Categories:
        3 with MasterCategory A, 1097 int's by date
        4 with MasterCategory B, 1097 int's by date
        1 with MasterCategory C, 1097 int's by date

尽力而为

[Lookup(of MasterCategory, Dictionary(of Date, Integer)]
-    length 3
-    Children of 3 Master Categories:
     1 of IEnumerable(of Dictionary(of Date, Integer)) and length 3
         3 x Dictionary length 1097 int's by date

     1 of IEnumerable(of Dictionary(of Date, Integer)) and length 4
         3 x Dictionary length 1097 int's by date

     1 of IEnumerable(of Dictionary(of Date, Integer)) and length 1
         3 x Dictionary length 1097 int's by date

必需

[Dictionary(MasterCategory, Dictionary(of Date, Integer))]
-    length 3
-    Children of 3 Master Categories:
     3 of Dictionary(of Date, Integer) with summed total int's

Answer 1

你是否在SelectMany之后？如果是这样，这可能会做你想要的事情：

C＃

test.SelectMany(x => x.Key.MasterCategory).Sum(x => x.ThePropertyToSum)

在VB中，我认为是：

test.SelectMany(Function(x) x.Key.MasterCategory).Sum(Function(x) x.ThePropertyToSum)

如何压缩字典字典并使用LINQ对内部字典的值进行求和？

1 个答案: