VB.Net エクセルから二次元配列

Imports Excel = Microsoft.Office.Interop.Excel

Module Module1
Sub Main()
Dim filePath As String = "C:\path\to\your\file.xlsx"
Dim data As Object(,) = ReadExcelToArray(filePath)

    ' 配列の内容を出力 (例)
    If data IsNot Nothing Then
        Dim rows As Integer = data.GetLength(0)
        Dim cols As Integer = data.GetLength(1)

        For i As Integer = 1 To rows
            For j As Integer = 1 To cols
                Console.Write(data(i, j) & vbTab)
            Next
            Console.WriteLine()
        Next
    End If
End Sub

Function ReadExcelToArray(ByVal filePath As String) As Object(,)
    Dim excelApp As New Excel.Application
    Dim workbook As Excel.Workbook = Nothing
    Dim worksheet As Excel.Worksheet = Nothing
    Dim range As Excel.Range = Nothing
    Dim data As Object(,)

    Try
        ' Excelを開く
        workbook = excelApp.Workbooks.Open(filePath)
        worksheet = workbook.Sheets(1) ' 1つ目のシートを取得
        range = worksheet.UsedRange ' 使用されている範囲を取得
        
        ' 範囲を2次元配列として取得
        data = range.Value

    Catch ex As Exception
        Console.WriteLine("エラー: " & ex.Message)
    Finally
        ' 後片付け
        If Not workbook Is Nothing Then workbook.Close(False)
        excelApp.Quit()
        ReleaseObject(range)
        ReleaseObject(worksheet)
        ReleaseObject(workbook)
        ReleaseObject(excelApp)
    End Try

    Return data
End Function

' COMオブジェクトを解放する関数
Private Sub ReleaseObject(ByVal obj As Object)
    Try
        If obj IsNot Nothing Then
            System.Runtime.InteropServices.Marshal.ReleaseComObject(obj)
            obj = Nothing
        End If
    Catch ex As Exception
        obj = Nothing
    Finally
        GC.Collect()
    End Try
End Sub

End Module