[C#]Npoi导出excel整理（附源码）

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

///  /// DataTable导出到Excel文件 ///  /// 源DataTable /// 表头文本 /// 保存位置 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();
                 }
             }
         } ///  /// DataTable导出到Excel的MemoryStream ///  /// 源DataTable /// 表头文本 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;
             } #endregion HSSFCellStyle 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(); } #endregion rowIndex = 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;
                     }

                 } #endregion rowIndex++;
             } 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sheet return ms;
             } 
         }

普通excel导出

#region 导出excel 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);
       } #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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