分享一个前辈的NPOIhelper
即拿即用:
首先要下载npoi的dll,此不赘述,接着添加引用:
using NPOI.HPSF; using NPOI.HSSF.UserModel; using NPOI.SS.UserModel; using NPOI.SS.Util;
下面是主要方法
public class NPOIHelper { /// <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; } #endregion HSSFCellStyle dateStyle = (HSSFCellStyle)workbook.CreateCellStyle(); HSSFDataFormat format = (HSSFDataFormat)workbook.CreateDataFormat(); dateStyle.DataFormat = format.GetFormat("yyyy-mm-dd"); //边框 dateStyle.BorderBottom = BorderStyle.Thin; dateStyle.BorderLeft = BorderStyle.Thin; dateStyle.BorderRight = BorderStyle.Thin; dateStyle.BorderTop = BorderStyle.Thin; //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 = HorizontalAlignment.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)); } #endregion #region 列头及样式 { HSSFRow headerRow = (HSSFRow)sheet.CreateRow(1); HSSFCellStyle headStyle = (HSSFCellStyle)workbook.CreateCellStyle(); headStyle.Alignment = HorizontalAlignment.Center; //边框 headStyle.BorderBottom = BorderStyle.Thin; headStyle.BorderLeft = BorderStyle.Thin; headStyle.BorderRight = BorderStyle.Thin; headStyle.BorderTop = BorderStyle.Thin; 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); #region 边框,样式 HSSFCellStyle NewCellStyle = (HSSFCellStyle)workbook.CreateCellStyle(); NewCellStyle.Alignment = HorizontalAlignment.Center; //边框 NewCellStyle.BorderBottom = BorderStyle.Thin; NewCellStyle.BorderLeft = BorderStyle.Thin; NewCellStyle.BorderRight = BorderStyle.Thin; NewCellStyle.BorderTop = BorderStyle.Thin; #endregion 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); newCell.CellStyle = NewCellStyle; 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); newCell.CellStyle = NewCellStyle; 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); newCell.CellStyle = NewCellStyle; break; case "System.Decimal"://浮点型 case "System.Double": double doubV = 0; double.TryParse(drValue, out doubV); newCell.SetCellValue(doubV); newCell.CellStyle = NewCellStyle; break; case "System.DBNull"://空值处理 newCell.SetCellValue(""); newCell.CellStyle = NewCellStyle; break; default: newCell.SetCellValue(""); newCell.CellStyle = NewCellStyle; break; } } #endregion rowIndex++; } using (MemoryStream ms = new MemoryStream()) { workbook.Write(ms); ms.Flush(); ms.Position = 0; return ms; } } }
后面调用这个类,如下:
string dir = Environment.GetFolderPath(Environment.SpecialFolder.DesktopDirectory);//取得当前桌面路径 NPOIHelper.DataTableToExcel(dt,"文档测试",dir+@"\测试.xls");
