回答編集履歴
1
SaveAs して開きなおすと反映される
    
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            **追記(4/17)**
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            ---
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            たしかに ClosedXML で計算式に影響のあるセルを書き換えた場合、計算式に反映されないですね。
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            SaveAs して開きなおすと反映されるようです。
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            ```vb
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            Imports ClosedXML.Excel
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            Module Module1
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                Sub Main()
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                    Const template As String = "d:\work\Book1.xlsx"
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                    Const newFile As String = "d:\work\Book2.xlsx"
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                    Using workbook As New XLWorkbook(template)
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                        Dim worksheet = workbook.Worksheet(1)
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                        worksheet.Cell("B5").Value = "B5"
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                        worksheet.Cell("B6").Value = "B6"
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                        worksheet.Cell("B7").Value = "B7"
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                        Dim cell = worksheet.Cell("B1")
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                        Console.WriteLine($"{cell.Value}")
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                        workbook.SaveAs(newFile)
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                    End Using
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                    Using workbook As New XLWorkbook(newFile)
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                        Dim worksheet = workbook.Worksheet(1)
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                        Dim cell = worksheet.Cell("B1")
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                        Console.WriteLine($"{cell.Value}")
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                    End Using
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                    Console.ReadKey()
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                End Sub
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            End Module
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            結果
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            ORDER NO.
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            3件
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            ORDER NO.
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            6件
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            ```
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