首先介绍一下NPOI吧。
public 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EXCEL MessageBox.Show(fileName + "保存成功", "提示", MessageBoxButtons.OK); }
NPOI导出到Excel表实现:
/// <summary> /// NPOI导出Excel,不依赖本地是否装有Excel,导出速度快 /// </summary> /// <param name="dataGridView1">要导出的dataGridView控件</param> /// <param name="sheetName">sheet表名</param> public static void ExportToExcel(DataGridView dataGridView1, string sheetName) { SaveFileDialog fileDialog = new SaveFileDialog(); fileDialog.Filter = "Excel|*.xls"; if (fileDialog.ShowDialog() == System.Windows.Forms.DialogResult.Cancel) { return; } //不允许dataGridView显示添加行,负责导出时会报最后一行未实例化错误 dataGridView1.AllowUserToAddRows = false; HSSFWorkbook workbook = new HSSFWorkbook(); ISheet sheet = workbook.CreateSheet(sheetName); IRow rowHead = sheet.CreateRow(0); //填写表头 for (int i = 0; i < dataGridView1.Columns.Count; i++) { rowHead.CreateCell(i, CellType.STRING).SetCellValue(dataGridView1.Columns[i].HeaderText.ToString()); } //填写内容 for (int i = 0; i < dataGridView1.Rows.Count; i++) { IRow row = sheet.CreateRow(i + 1); for (int j = 0; j < dataGridView1.Columns.Count; j++) { row.CreateCell(j, CellType.STRING).SetCellValue(dataGridView1.Rows[i].Cells[j].Value.ToString()); } } using (FileStream stream = File.OpenWrite(fileDialog.FileName)) { workbook.Write(stream); stream.Close(); } MessageBox.Show("导出数据成功!", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information); GC.Collect(); }
经过比较:如果导出50000条int类型的数据,基于office导出需要10分钟左右的时间,NPOI导出则需要3秒钟左右的时间。
NPOI导出时间截图如下:
基于office导出时间截图如下:
呵呵,看出来两者的速度了吧,并且NPOI用起来相当的灵活,第一次写博客,希望和大家共同分享,共同学习,共同进步!
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