从datagridview导入后关闭Excel进程

using System;
using System.Windows.Forms;
using Microsoft.Office.Interop.Excel;
using System.Runtime.InteropServices;

namespace ExcelImportApp
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void btnImport_Click(object sender, EventArgs e)
        {
            // 创建Excel应用程序对象
            Application excelApp = new Application();

            // 打开Excel文件
            Workbook workbook = excelApp.Workbooks.Open("C:\\path\\to\\excel.xlsx");

            // 获取工作表对象
            Worksheet worksheet = workbook.Worksheets[1];

            // 读取数据到datagridview
            for (int row = 1; row <= worksheet.UsedRange.Rows.Count; row++)
            {
                for (int col = 1; col <= worksheet.UsedRange.Columns.Count; col++)
                {
                    dataGridView1.Rows[row - 1].Cells[col - 1].Value = worksheet.Cells[row, col].Value;
                }
            }

            // 释放Excel对象
            Marshal.ReleaseComObject(worksheet);
            Marshal.ReleaseComObject(workbook);

            // 关闭Excel进程
            excelApp.Quit();
            Marshal.ReleaseComObject(excelApp);
        }
    }
}