回答編集履歴
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add
test
CHANGED
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@@ -6,50 +6,68 @@
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```VB
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Module Module1
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Sub Main()
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Dim list = New List(Of Item)
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list.Add(New Item() With {.Id = 1, .Num = 10})
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list.Add(New Item() With {.Id = 1, .Num = 15})
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list.Add(New Item() With {.Id = 2, .Num = 5})
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list.Add(New Item() With {.Id = 3, .Num = 15})
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list.Add(New Item() With {.Id = 4, .Num = 30})
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list.Add(New Item() With {.Id = 4, .Num = 55})
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list.Add(New Item() With {.Id = 4, .Num = 25})
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list.Add(New Item() With {.Id = 5, .Num = 20})
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list.Add(New Item() With {.Id = 5, .Num = 10})
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'Ca
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'CSV Data
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Dim
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Dim list = New List(Of Item)
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list.Add(New Item() With {.Id = 1, .Num = 10})
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list.Add(New Item() With {.Id = 1, .Num = 15})
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list.Add(New Item() With {.Id = 2, .Num = 5})
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list.Add(New Item() With {.Id = 3, .Num = 15})
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list.Add(New Item() With {.Id = 4, .Num = 30})
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list.Add(New Item() With {.Id = 4, .Num = 55})
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list.Add(New Item() With {.Id = 4, .Num = 25})
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list.Add(New Item() With {.Id = 5, .Num = 20})
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list.Add(New Item() With {.Id = 5, .Num = 10})
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'Calc
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Dim result = list.GroupBy(Function(a) a.Id).
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Select(Function(y) New With
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{
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.Id = y.Key,
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.Sum = y.Sum(Function(z) z.Num)
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})
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End Sub
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End Sub
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End Module
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Class Item
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Property Id As Integer
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Property Num As Integer
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End Class
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```
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