谁能告诉我如何用C#获取Excel Workbook的登录用户名？

using Microsoft.Office.Interop.Excel;

Application excelApp = new Application();
Workbook workbook = excelApp.Workbooks.Open("你的Excel文件路径");

string username = workbook.Application.UserName;

using Microsoft.Office.Interop.Excel;

namespace ExcelUsernameExample
{
    class Program
    {
        static void Main(string[] args)
        {
            Application excelApp = new Application();
            Workbook workbook = excelApp.Workbooks.Open("你的Excel文件路径");

            string username = workbook.Application.UserName;
            Console.WriteLine("Excel登录用户名：" + username);

            workbook.Close();
            excelApp.Quit();
        }
    }
}