如何将Datagridview导出到Excel工作簿

using System;
using System.Data;
using System.Windows.Forms;
using Excel = Microsoft.Office.Interop.Excel;

Excel.Application excelApp = new Excel.Application();

Excel.Workbook workbook = excelApp.Workbooks.Add(Type.Missing);

Excel.Worksheet worksheet = (Excel.Worksheet)workbook.ActiveSheet;

for (int i = 0; i < dataGridView.Rows.Count; i++)
{
    for (int j = 0; j < dataGridView.Columns.Count; j++)
    {
        worksheet.Cells[i + 1, j + 1] = dataGridView.Rows[i].Cells[j].Value.ToString();
    }
}

worksheet.Columns.AutoFit();

SaveFileDialog saveFileDialog = new SaveFileDialog();
saveFileDialog.Filter = "Excel文件|*.xlsx";
saveFileDialog.Title = "保存Excel文件";
saveFileDialog.ShowDialog();

if (saveFileDialog.FileName != "")
{
    workbook.SaveAs(saveFileDialog.FileName);
    MessageBox.Show("导出成功！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}

excelApp.Quit();