源代码：

private void ExportExcel(string fileName, DevExpress.XtraGrid.Views.Grid.GridView myDGV)

        {

            string saveFileName = "";

            SaveFileDialog saveDialog = new SaveFileDialog();

            saveDialog.DefaultExt = "xlsx";

            saveDialog.Filter = "Excel文件|*.xlsx";

            saveDialog.FileName = fileName;

            saveDialog.ShowDialog();

            saveFileName = saveDialog.FileName;

            if (saveFileName.IndexOf(":") < 0) return; //被点了取消

            Microsoft.Office.Interop.Excel.Application xlApp = new Microsoft.Office.Interop.Excel.Application();

            if (xlApp == null)

            {

                MessageBox.Show("无法创建Excel对象，可能您的机子未安装Excel");

                return;

            }

            Microsoft.Office.Interop.Excel.Workbooks workbooks = xlApp.Workbooks;

            Microsoft.Office.Interop.Excel.Workbook workbook = workbooks.Add(Microsoft.Office.Interop.Excel.XlWBATemplate.xlWBATWorksheet);

            Microsoft.Office.Interop.Excel.Worksheet worksheet = (Microsoft.Office.Interop.Excel.Worksheet)workbook.Worksheets[1];//取得sheet1

            int j = 0;//筛选掉隐藏的列

            //写入标题

            for (int i = 0; i < myDGV.Columns.Count; i++)

            {

                //myDGV.Columns[i].HeaderText;

                if (myDGV.Columns[i].Visible == true)

                {

                    worksheet.Cells[1, j + 1] = myDGV.Columns[i].Caption;

                    j++;

                }

            }

            //写入数值

            for (int r = 0; r < myDGV.RowCount; r++)

            {

                int k = 0;//筛选掉隐藏的列

                for (int i = 0; i < myDGV.Columns.Count; i++)

                {

                    if (myDGV.Columns[i].Visible == true)

                    {

                        worksheet.Cells[r + 2, k + 1] = myDGV.GetRowCellValue(r, myDGV.Columns[i]);

                        k++;

                    }

                }

                System.Windows.Forms.Application.DoEvents();

            }

            worksheet.Columns.EntireColumn.AutoFit();//列宽自适应

            if (saveFileName != "")

            {

                try

                {

                    workbook.Saved = true;

                    workbook.SaveCopyAs(saveFileName);

                }

                catch (Exception ex)

                {

                    MessageBox.Show("导出文件时出错,文件可能正被打开！\n" + ex.Message);

                }

            }

            xlApp.Quit();

            GC.Collect();//强行销毁

            MyCommon.ShowMessageBox(this, fileName + ".xlsx 导出成功", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);

        }

//导出按钮事件

        private void button3_Click(object sender, EventArgs e)

        {

//第一个是名称，第二个是gridview

            ExportExcel("测试", gridView1);

        }

需要注意的是：在导出中gridview中的列要按顺序排列出来，要和前台显示保持一致，这里增加了隐藏列的方法，可以将隐藏的列筛选出来，office中2010以下的版本需要修改

saveDialog.DefaultExt = "xls";

saveDialog.Filter = "Excel文件|*.xls";

以上的版本就不用修改了，动态创建出来了；

dev中的gridview导出excel文件