DataGridView导出数据到Excel

   //传入DataGridView
         /// <summary>
         /// 输出数据到Excel
         /// </summary>
         /// <param name="dataGridView">DataGridView</param>
         /// <param name="includeHeader">是否包含字段名</param>
         /// <param name="savePath">保存路径</param>
         /// <returns>成功TRUE/失败FALSE</returns>
         public static bool ExportExcel(DataGridView dataGridView, bool includeHeader, string savePath)
         {
             bool succeed = true;
             try
             {
                 //创建工作薄
                 IWorkbook wbook = null;
                 //创建工作表
                 ISheet sheet = null;
                 wbook = ICreateIWorkBook(savePath, null);
                 sheet = wbook.CreateSheet("Sheet1");           //创建工作表
                 int columnCount = dataGridView.ColumnCount;    //获取行数
                 int rowCount = dataGridView.RowCount;          //获取列数
                 int rowIndex = ;
                 IRow row = null;
                 ICell cell;
                 int start = ;    //是否包含表头行数
                 //dataGridView是否有数据
                 if (rowCount <= )
                 {
                     succeed = false;
                     Exception error = new Exception("无可用于导出的数据");
                     throw error;
                 }
                 //是否包含表头
                 if (includeHeader)
                 {
                     row = sheet.CreateRow(rowIndex);
                     //输入标题表头行
                     for (int i = ; i < columnCount; i++)
                     {
                         cell = row.CreateCell(i);
                         cell.SetCellValue(dataGridView.Columns[i].HeaderText);
                     }
                     ++start;     //如果包含表头行索引累加
                 }

                 //DataGridView有多少行
                 for (; rowIndex < rowCount; ++rowIndex)
                 {
                     row = sheet.CreateRow(rowIndex + start);    //创建行
                     for (int cellIndex = ; cellIndex < columnCount; ++cellIndex)
                     {
                         Type type = dataGridView[cellIndex, rowIndex].ValueType;
                         object value = dataGridView[cellIndex, rowIndex].Value;
                         cell = row.CreateCell(cellIndex);     //创建单元格
                         //写入数据
                         if (type == typeof(Int32))
                         {
                             cell.SetCellValue((int)dataGridView[cellIndex, rowIndex].Value);
                         }
                         else if (type == typeof(Double))
                         {
                             cell.SetCellValue((double)value);
                         }
                         else if (type == typeof(float))
                         {
                             cell.SetCellValue((float)value);
                         }
                         else if (type == typeof(DateTime))
                         {
                             cell.SetCellValue((DateTime)value);
                         }
                         else if (type == typeof(Boolean))
                         {
                             cell.SetCellValue((bool)value);
                         }
                         else
                         {
                             cell.SetCellValue((string)value);
                         }
                     }
                 }
                 //保存的文件流保存或创建
                 FileStream fs = new FileStream(savePath, FileMode.OpenOrCreate);
                 wbook.Write(fs);   //写入文件
                 wbook.Close();
                 fs.Close();

             }
             catch (Exception ex)
             {
                 succeed = false;
                 throw ex;
             }
             return succeed;
         }

         /// <summary>
         /// 根据文件格式返回表文件
         /// </summary>
         /// <param name="filePath">文件路径</param>
         /// <param name="fs">文件流</param>
         /// <returns>IWorkBook 表</returns>
         private static IWorkbook ICreateIWorkBook(string filePath, FileStream fs)
         {
             IWorkbook wbook = null;
             //读取用户选择的保存格式
             string extesion = Path.GetExtension(filePath).ToLower();
             if (extesion.Equals(".xlsx"))
             //if( saveFile.FileName.IndexOf(".xlsx") > 0);
             {
                 if (null != fs)
                 {
                     wbook = new XSSFWorkbook(fs);
                 }
                 else
                 {
                     wbook = new XSSFWorkbook();
                 }
             }
             else if (extesion.Equals(".xls"))
             //else if (saveFile.FileName.IndexOf(".xls") > 0) ;    //这种方法也可以实现但.xlsx必须在前面
             {
                 if (null != fs)
                 {
                     wbook = new HSSFWorkbook(fs);
                 }
                 else
                 {
                     wbook = new HSSFWorkbook();
                 }
             }
             else    //如果不是上述两种格式,因为设置了过滤器几乎不会出现下面的情况
             {
                 //MessageBox.Show("对不起，您所输入的文件格式不受支持！");
                 //return null;
                 Exception error = new Exception("文件格式不正确!");
                 throw error;
             }
             return wbook;
         }

//如有问题欢迎大家指正