using System.Runtime.InteropServices;
using System.Reflection;
class Program
{
    static void Main(string[] args)
    {
        //Excelファイルパス
        try
        {
            // Excel操作用COMオブジェクトを生成する
            System.Type t        = System.Type.GetTypeFromProgID("Excel.Application");
            object      excelApp = System.Activator.CreateInstance(t);

            // Excelファイルの表示
            excelApp.GetType().InvokeMember("Visible", BindingFlags.SetProperty, null, excelApp, new object[] { true });

            //警告メッセージをOFF
            excelApp.GetType().InvokeMember("DisplayAlerts", BindingFlags.SetProperty, null, excelApp, new object[] { false });

            //ワークブックコレクションオブジェクトを生成する。
            object excelBooks = excelApp.GetType().InvokeMember("Workbooks", BindingFlags.GetProperty, null, excelApp, null);

            //Excelファイルのオープン
            object excelBook = excelBooks.GetType().InvokeMember
            (
                "Open"
            ,   BindingFlags.InvokeMethod
            ,   null
            ,   excelBooks
            ,   new object[]
                {
                    args[0]
                ,   false
                ,   true
                ,   System.Type.Missing
                ,   System.Type.Missing
                ,   System.Type.Missing
                ,   System.Type.Missing
                ,   System.Type.Missing
                ,   System.Type.Missing
                ,   System.Type.Missing
                ,   System.Type.Missing
                ,   System.Type.Missing
                ,   System.Type.Missing
                }
            );

            object excelSheets = excelBook.GetType().InvokeMember("Worksheets", BindingFlags.GetProperty, null, excelBook, null);
            object cnt         = excelSheets.GetType().InvokeMember("Count", BindingFlags.GetProperty, null, excelSheets, null);
            for (int i=1;i<=System.Convert.ToInt32(cnt);i++)
            {
                object sheet = excelSheets.GetType().InvokeMember("Item", BindingFlags.GetProperty, null, excelSheets, new object[1]{i});
                object sheetName = sheet.GetType().InvokeMember("Name", BindingFlags.GetProperty, null, sheet, null);
                System.Console.WriteLine(sheetName);
            }

            //閉じる
            excelApp.GetType().InvokeMember("Quit", System.Reflection.BindingFlags.InvokeMethod, null, excelApp, null);

            //COM解放
            System.Runtime.InteropServices.Marshal.FinalReleaseComObject(excelBook);
            excelBook = null;

            System.Runtime.InteropServices.Marshal.FinalReleaseComObject(excelBooks);
            excelBooks = null;

            System.Runtime.InteropServices.Marshal.FinalReleaseComObject(excelApp);
            excelApp = null;
        }
        catch(System.Exception ex)
        {
            System.Console.WriteLine(ex.Message, "Error" );
        }
    }
}