在写商业软件的时候，我们会经常遇到对excel表格的操控，最常见的就是Datagridview控件导入/导出excel表格。我也同样遇到了。运用了自己的知识，再加上网上的【大部分】都过期的源码，自己写出了这两个方法，当然，和绑定数据库一样，都用到了databel类。 
导入：

//private string fileName;  

        /// <summary>  
                /// 将DataGridView中数据导入到Excel  
                /// </summary>  
                /// <param name="dgv">DataGridView的名称</param>  

        public System.Data.DataTable ImportExcel(string path)
        {
            DataSet ds = new DataSet();
            string strConn = "";
            if (Path.GetExtension(path) == ".xls")
            {
                strConn = string.Format("Provider=Microsoft.Jet.OLEDB.4.0;Data Source={0};Extended Properties=Excel 8.0;", path);
            }
            else
            {
                strConn = string.Format("Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties=Excel 8.0;", path);
            }
            using (var oledbConn = new OleDbConnection(strConn))
            {
                oledbConn.Open();
                var sheetName = oledbConn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new[] { null, null, null, "Table" });
                var sheet = new string[sheetName.Rows.Count];
                for (int i = 0, j = sheetName.Rows.Count; i < j; i++)
                {
                    sheet[i] = sheetName.Rows[i]["TABLE_NAME"].ToString();
                }
                var adapter = new OleDbDataAdapter(string.Format("select * from [{0}]", sheet[0]), oledbConn);
                adapter.Fill(ds);
            }
            return ds.Tables[0];
        }
        public void daoru(){
            string filePath = "";
            OpenFileDialog openFileDialog1 = new OpenFileDialog();
            openFileDialog1.Filter = "excel文件|*.xls";
            openFileDialog1.FilterIndex = 2;
            openFileDialog1.RestoreDirectory = true;
            if (openFileDialog1.ShowDialog() == DialogResult.OK)
            {
                filePath = openFileDialog1.FileName;
                System.Data.DataTable dt = ImportExcel(filePath);
                this.dataGridView1.DataSource = dt;
            }
   }

导出：

   public static void ExportExcel(string fileName, DataGridView myDGV)
        {
            if (myDGV.Rows.Count > 0)
            {

                string saveFileName = "";
                //bool fileSaved = false;  
                SaveFileDialog saveDialog = new SaveFileDialog();
                saveDialog.DefaultExt = "xls";
                saveDialog.Filter = "Excel文件|*.xls";
                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  

                //写入标题  
                for (int i = 0; i < myDGV.ColumnCount; i++)
                {
                    worksheet.Cells[1, i + 1] = myDGV.Columns[i].HeaderText;
                }
                //写入数值  
                for (int r = 0; r < myDGV.Rows.Count; r++)
                {
                    for (int i = 0; i < myDGV.ColumnCount; i++)
                    {
                        worksheet.Cells[r + 2, i + 1] = myDGV.Rows[r].Cells[i].Value;
                    }
                    System.Windows.Forms.Application.DoEvents();
                }
                worksheet.Columns.EntireColumn.AutoFit();//列宽自适应  
                                                      //   if (Microsoft.Office.Interop.cmbxType.Text != "Notification")  
                                                      //   {  
                                                      //       Excel.Range rg = worksheet.get_Range(worksheet.Cells[2, 2], worksheet.Cells[ds.Tables[0].Rows.Count + 1, 2]);  
                                                      //      rg.NumberFormat = "00000000";  
                                                      //   }  

                if (saveFileName != "")
                {
                    try
                    {
                        workbook.Saved = true;
                        workbook.SaveCopyAs(saveFileName);
                        //fileSaved = true;  
                    }
                    catch (Exception ex)
                    {
                        //fileSaved = false;  
                        MessageBox.Show("导出文件时出错,文件可能正被打开！\n" + ex.Message);
                    }

                }
                //else  
                //{  
                //    fileSaved = false;  
                //}  
                xlApp.Quit();
                GC.Collect();//强行销毁   
                             // if (fileSaved && System.IO.File.Exists(saveFileName)) System.Diagnostics.Process.Start(saveFileName); //打开EXCEL  
                MessageBox.Show("导出文件成功", "提示", MessageBoxButtons.OK);
            }
            else
            {
                MessageBox.Show("报表为空,无表格需要导出", "提示", MessageBoxButtons.OK);
            }

        }

在使用代码段之前不要忘记添加引用：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.OleDb;
using System.IO;
using System.Linq;
using System.Diagnostics;
using Microsoft.Office.Interop.Excel;

(⊙o⊙)哦，对了，还不要忘记引用这个！