任意の複数のExcelブックのセルの値を取得する(ExcelVBA)

掲題の通り、任意の複数のExcelブックのセルの値を取得する方法。
「の」が多いな。

Sub ボタン1_Click()
    Dim fileNames As Variant
    Dim fileName As Variant
    
    Dim tmpSheet As Worksheet
    
    fileNames = Application.GetOpenFilename(MultiSelect:=True)
    
    If IsArray(fileNames) Then
        For Each fileName In fileNames
            Workbooks.Open fileName
            Set tmpSheet = ActiveWorkbook.Worksheets(1)
            tmpSheet.Activate
           
            Debug.Print tmpSheet.Cells(1, 1).Value
           
            Set tmpSheet = Nothing
            ActiveWorkbook.Close
        Next fileName
    Else
        Exit Sub
    End If
End Sub