前些日子做了一个简单的winform程序,需要导出的功能,刚开始省事直接使用微软的组件,但是导出之后发现效率极其低下,绝对像web那样使用npoi组件,因此简单的进行了整理,包括直接根据DataTable导出excel及DataGridview导出excel,版本是1.2.4,下面贴下主要代码两种方式,1、NPOI导出excel、 2、普通的导出excel
下面贴下主要代码:NPOI导出
/// <summary>/// DataTable导出到Excel文件/// </summary>/// <param name="dtSource">源DataTable</param>/// <param name="strHeaderText">表头文本</param>/// <param name="strFileName">保存位置</param>public static void DataTableToExcel(DataTable dtSource, string strHeaderText, string strFileName){using (MemoryStream ms = DataTableToExcel(dtSource, strHeaderText)){using (FileStream fs = new FileStream(strFileName, FileMode.Create, FileAccess.Write)){byte[] data = ms.ToArray();fs.Write(data, 0, data.Length);fs.Flush();}}}/// <summary>/// DataTable导出到Excel的MemoryStream/// </summary>/// <param name="dtSource">源DataTable</param>/// <param name="strHeaderText">表头文本</param>public static MemoryStream DataTableToExcel(DataTable dtSource, string strHeaderText){HSSFWorkbook workbook = new HSSFWorkbook();HSSFSheet sheet = (HSSFSheet)workbook.CreateSheet();#region 右击文件 属性信息{DocumentSummaryInformation dsi = PropertySetFactory.CreateDocumentSummaryInformation();dsi.Company = "NPOI";workbook.DocumentSummaryInformation = dsi;SummaryInformation si = PropertySetFactory.CreateSummaryInformation();si.Author = "文件作者信息"; //填加xls文件作者信息si.ApplicationName = "创建程序信息"; //填加xls文件创建程序信息si.LastAuthor = "最后保存者信息"; //填加xls文件最后保存者信息si.Comments = "作者信息"; //填加xls文件作者信息si.Title = "标题信息"; //填加xls文件标题信息si.Subject = "主题信息";//填加文件主题信息si.CreateDateTime = System.DateTime.Now;workbook.SummaryInformation = si;}#endregionHSSFCellStyle dateStyle = (HSSFCellStyle)workbook.CreateCellStyle();HSSFDataFormat format = (HSSFDataFormat)workbook.CreateDataFormat();dateStyle.DataFormat = format.GetFormat("yyyy-mm-dd");//取得列宽int[] arrColWidth = new int[dtSource.Columns.Count];foreach (DataColumn item in dtSource.Columns){arrColWidth[item.Ordinal] = Encoding.GetEncoding(936).GetBytes(item.ColumnName.ToString()).Length;}for (int i = 0; i < dtSource.Rows.Count; i++){for (int j = 0; j < dtSource.Columns.Count; j++){int intTemp = Encoding.GetEncoding(936).GetBytes(dtSource.Rows[i][j].ToString()).Length;if (intTemp > arrColWidth[j]){arrColWidth[j] = intTemp;}}} int rowIndex = 0; foreach (DataRow row in dtSource.Rows){#region 新建表,填充表头,填充列头,样式if (rowIndex == 65535 || rowIndex == 0){if (rowIndex != 0){sheet = (HSSFSheet)workbook.CreateSheet();}#region 表头及样式{HSSFRow headerRow = (HSSFRow)sheet.CreateRow(0);headerRow.HeightInPoints = 25;headerRow.CreateCell(0).SetCellValue(strHeaderText);HSSFCellStyle headStyle = (HSSFCellStyle)workbook.CreateCellStyle();// headStyle.Alignment = CellHorizontalAlignment.CENTER;HSSFFont font = (HSSFFont)workbook.CreateFont();font.FontHeightInPoints = 20;font.Boldweight = 700;headStyle.SetFont(font);headerRow.GetCell(0).CellStyle = headStyle;// sheet.AddMergedRegion(new Region(0, 0, 0, dtSource.Columns.Count - 1));//headerRow.Dispose();}#endregion#region 列头及样式{HSSFRow headerRow = (HSSFRow)sheet.CreateRow(1); HSSFCellStyle headStyle = (HSSFCellStyle)workbook.CreateCellStyle();//headStyle.Alignment = CellHorizontalAlignment.CENTER;HSSFFont font = (HSSFFont)workbook.CreateFont();font.FontHeightInPoints = 10;font.Boldweight = 700;headStyle.SetFont(font); foreach (DataColumn column in dtSource.Columns){headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);headerRow.GetCell(column.Ordinal).CellStyle = headStyle;//设置列宽sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal] + 1) * 256); }// headerRow.Dispose();}#endregionrowIndex = 2;}#endregion#region 填充内容HSSFRow dataRow = (HSSFRow)sheet.CreateRow(rowIndex);foreach (DataColumn column in dtSource.Columns){HSSFCell newCell =(HSSFCell) dataRow.CreateCell(column.Ordinal);string drValue = row[column].ToString();switch (column.DataType.ToString()){case "System.String"://字符串类型newCell.SetCellValue(drValue);break;case "System.DateTime"://日期类型System.DateTime dateV;System.DateTime.TryParse(drValue, out dateV);newCell.SetCellValue(dateV);newCell.CellStyle = dateStyle;//格式化显示break;case "System.Boolean"://布尔型bool boolV = false;bool.TryParse(drValue, out boolV);newCell.SetCellValue(boolV);break;case "System.Int16"://整型case "System.Int32":case "System.Int64":case "System.Byte":int intV = 0;int.TryParse(drValue, out intV);newCell.SetCellValue(intV);break;case "System.Decimal"://浮点型case "System.Double":double doubV = 0;double.TryParse(drValue, out doubV);newCell.SetCellValue(doubV);break;case "System.DBNull"://空值处理newCell.SetCellValue("");break;default:newCell.SetCellValue("");break;}}#endregionrowIndex++;} using (MemoryStream ms = new MemoryStream()){workbook.Write(ms);ms.Flush();ms.Position = 0;sheet.Dispose();//workbook.Dispose();//一般只用写这一个就OK了,他会遍历并释放所有资源,但当前版本有问题所以只释放sheetreturn ms;} }
普通excel导出
#region 导出excelpublic static void ExportExcel(string fileName, DataGridView myDGV,bool isShowDialog){string saveFileName = "";if (isShowDialog){//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 }else{// saveFileName = Application.StartupPath + @"\导出记录\" + fileName + ".xls";saveFileName = fileName;}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++){if (myDGV[i, r].ValueType == typeof(string)|| myDGV[i, r].ValueType == typeof(DateTime))//这里就是验证DataGridView单元格中的类型,如果是string或是DataTime类型,则在放入缓 存时在该内容前加入" ";{worksheet.Cells[r + 2, i + 1] = "'" + myDGV.Rows[r].Cells[i].Value;}else{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EXCELMessageBox.Show(fileName + "保存成功", "提示", MessageBoxButtons.OK);}#endregion
5万条数据性能测试
下面附上源码,里面有NPOI和普通导出excel的性能比较。
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