本文为大家分享了基于NPOI用C#开发的Excel以及表格设置,供大家参考,具体内容如下
最近在项目中需要导出Excel。在这里做个记录。在网上查阅了一些资料。将自己最终的代码分享在这里,以供自己日后查阅,如果能给陌生的你带来方便,那便更好。
开发的过程中也遇到了一个问题,设置字体会导致打开Excel时报错(错误:此文件中的某些文本格式可能已经更改,因为它已经超出最多允许的字体数),并且设置失败。这个问题产生的原因是因为频繁的创建字体,这个在我参考的代码中是有问题,我做了些改善。如果你有更优的方案,期待向你学习。
public class ExcelDAL { #region 定义单元格常用到样式的枚举 public enum stylexls { 头, 列标题, url, 时间, 数字, 钱, 百分比, 中文大写, 科学计数法, 默认 } #endregion //定义工作薄 private static IWorkbook m_workbook; //定义sheet表 private static ISheet m_sheet; //表名 private static Listm_sheets=new List (); private static ICellStyle m_cellStyle; private static IDataFormat m_datastyle; //字体 private static IFont m_font20; //字体 private static IFont m_font12; //字体 private static IFont m_font; /// /// 创建Excel表 /// /// 传递datatable数据类型 /// 文件保存路径 /// 工作表名 /// 表格标题名 ///public static bool ExportExcel(System.Data.DataTable dt, string filePath, string sheetName,string headerName="考勤表") { ICellStyle cellstytle = null; try { //如果Excel存在就获取IWorkbook对象,否则就重新创建 if (File.Exists(filePath)) { FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read); if (filePath.IndexOf(".xlsx") > 0) // 2007版本 m_workbook = new XSSFWorkbook(fs); else if (filePath.IndexOf(".xls") > 0) // 2003版本 m_workbook = new HSSFWorkbook(fs); } else { //创建一个工作簿 m_workbook = new HSSFWorkbook(); } if (m_workbook != null) { //获取所有SheetName int count = m_workbook.NumberOfSheets; //如果该工作簿不存在表就创建新表 if (count < 1) { //创建一个 sheet 表 m_sheet = m_workbook.CreateSheet(sheetName); } else { m_sheets.Clear(); for (int i = 0; i < count; i++) { m_sheet = m_workbook.GetSheetAt(i); m_sheets.Add(m_sheet.SheetName); } if(m_sheets.Contains(sheetName)) { m_sheet = m_workbook.CreateSheet(sheetName+System.DateTime.Now.ToString("HH-mm-ss")+"副本"); } else { m_sheet = m_workbook.CreateSheet(sheetName); } } } else { return false; } #region 打印设置 m_sheet.PrintSetup.Copies = 3; m_sheet.PrintSetup.Landscape = false; m_sheet.PrintSetup.Scale = 100; //纸张设置,A4纸 m_sheet.PrintSetup.PaperSize = 9; //打印网格线 m_sheet.IsPrintGridlines = true; #endregion #region 设置表头 m_sheet.AddMergedRegion(new NPOI.SS.Util.CellRangeAddress(0, 0, 0, dt.Columns.Count-1)); //合并单元格 IRow row0 = m_sheet.CreateRow(0); //创建一行 row0.Height = 50 * 20; ICell icelltop0 = row0.CreateCell(0); //创建一个单元格 IFont font = m_workbook.CreateFont(); font.FontHeightInPoints = 30; icelltop0.CellStyle = Getcellstyle(m_workbook, stylexls.头); icelltop0.SetCellValue(headerName); #endregion #region 设置列 IRow rowH = m_sheet.CreateRow(1); cellstytle= Getcellstyle(m_workbook, stylexls.列标题); //设置列名 foreach (DataColumn col in dt.Columns) { //创建单元格并设置单元格内容 rowH.CreateCell(col.Ordinal).SetCellValue(col.Caption); //设置单元格格式 rowH.Cells[col.Ordinal].CellStyle = cellstytle; } #endregion //写入数据 cellstytle = Getcellstyle(m_workbook, stylexls.默认); for (int i = 0; i < dt.Rows.Count; i++) { //跳过前两行,第一行为标题,第二行为列名 IRow row = m_sheet.CreateRow(i + 2); ICell cell = row.CreateCell(0); for (int j = 0; j < dt.Columns.Count; j++) { cell = row.CreateCell(j); cell.SetCellValue(dt.Rows[i][j].ToString()); cell.CellStyle = cellstytle; } } //获取当前列的宽度,然后对比本列的长度,取最大值 for (int columnNum = 0; columnNum <= dt.Rows.Count; columnNum++) { int columnWidth = m_sheet.GetColumnWidth(columnNum) / 256; for (int rowNum = 1; rowNum <= m_sheet.LastRowNum; rowNum++) { IRow currentRow; //当前行未被使用过 if (m_sheet.GetRow(rowNum) == null) { currentRow = m_sheet.CreateRow(rowNum); } else { currentRow = m_sheet.GetRow(rowNum); } if (currentRow.GetCell(columnNum) != null) { ICell currentCell = currentRow.GetCell(columnNum); int length = Encoding.Default.GetBytes(currentCell.ToString()).Length; if (columnWidth < length) { columnWidth = length + 10; } } } m_sheet.SetColumnWidth(columnNum, columnWidth * 256); //m_sheet.SetColumnWidth(0, 30 * 256); //m_sheet.SetColumnWidth(1, 10 * 256); //m_sheet.SetColumnWidth(2, 25 * 256); //m_sheet.SetColumnWidth(3, 25 * 256); //m_sheet.SetColumnWidth(4, 10 * 256); //m_sheet.SetColumnWidth(5, 10 * 256); } //创建文件 FileStream file = new FileStream(filePath, FileMode.OpenOrCreate, FileAccess.Write); //创建一个 IO 流 MemoryStream ms = new MemoryStream(); //写入到流 m_workbook.Write(ms); //转换为字节数组 byte[] bytes = ms.ToArray(); file.Write(bytes, 0, bytes.Length); file.Flush(); //释放资源 bytes = null; ms.Close(); ms.Dispose(); file.Close(); file.Dispose(); m_workbook.Close(); m_sheet = null; m_workbook = null; m_cellStyle = null; m_datastyle = null; m_font = null; m_font12 = null; m_font20 = null; return true; } catch (Exception ex) { return false; } } #region 定义单元格常用到样式 static ICellStyle Getcellstyle(IWorkbook wb, stylexls str) { try { //CreateFont()不能频繁创建,会导致打开EXCEL表的时候报如下错误: //此文件中的某些文本格式可能已经更改,因为它已经超出最多允许的字体数。 if (m_font20 == null) { m_font20 = wb.CreateFont(); m_font20.FontHeightInPoints = 20; m_font20.FontName = "微软雅黑"; m_font20.Boldweight = (short)FontBoldWeight.Bold; } if (m_font12 == null) { m_font12 = wb.CreateFont(); m_font12.FontHeightInPoints = 12; m_font12.FontName = "微软雅黑"; m_font12.Boldweight = (short)FontBoldWeight.Bold; } if (m_font == null) { m_font = wb.CreateFont(); m_font.FontName = "微软雅黑"; } //if (m_cellStyle == null) //{ m_cellStyle = wb.CreateCellStyle(); //边框 m_cellStyle.BorderBottom = NPOI.SS.UserModel.BorderStyle.Medium; m_cellStyle.BorderLeft = NPOI.SS.UserModel.BorderStyle.Medium; m_cellStyle.BorderRight = NPOI.SS.UserModel.BorderStyle.Medium; m_cellStyle.BorderTop = NPOI.SS.UserModel.BorderStyle.Medium; //边框颜色 m_cellStyle.BottomBorderColor = HSSFColor.OliveGreen.Blue.Index; m_cellStyle.TopBorderColor = HSSFColor.OliveGreen.Blue.Index; //背景图形 //cellStyle.FillBackgroundColor = HSSFColor.OLIVE_GREEN.BLUE.index; //cellStyle.FillForegroundColor = HSSFColor.OLIVE_GREEN.BLUE.index; m_cellStyle.FillForegroundColor = HSSFColor.White.Index; // cellStyle.FillPattern = FillPatternType.NO_FILL; m_cellStyle.FillBackgroundColor = HSSFColor.Blue.Index; //水平对齐 m_cellStyle.Alignment = NPOI.SS.UserModel.HorizontalAlignment.Center; //垂直对齐 m_cellStyle.VerticalAlignment = VerticalAlignment.Center; //自动换行 m_cellStyle.WrapText = false; //缩进 //cellStyle.Indention = 0; //} //创建格式 if (m_datastyle == null) { m_datastyle = wb.CreateDataFormat(); } //上面基本都是设共公的设置 //下面列出了常用的字段类型 switch (str) { case stylexls.头: //cellStyle.FillPattern = FillPatternType.LEAST_DOTS; //设置为文本格式,也可以为 text,即 dataFormat.GetFormat("text"); m_cellStyle.DataFormat = m_datastyle.GetFormat("@"); m_cellStyle.SetFont(m_font20); break; case stylexls.列标题: // cellStyle.FillPattern = FillPatternType.LEAST_DOTS; m_cellStyle.DataFormat = m_datastyle.GetFormat("@"); m_cellStyle.SetFont(m_font12); break; case stylexls.时间: m_cellStyle.DataFormat = m_datastyle.GetFormat("yyyy/mm/dd"); m_cellStyle.SetFont(m_font); break; case stylexls.数字: m_cellStyle.DataFormat = HSSFDataFormat.GetBuiltinFormat("0.00"); m_cellStyle.SetFont(m_font); break; case stylexls.钱: m_cellStyle.DataFormat = m_datastyle.GetFormat("¥#,##0"); m_cellStyle.SetFont(m_font); break; case stylexls.url: //IFont fontcolorblue = wb.CreateFont(); //fontcolorblue.Color = HSSFColor.OliveGreen.Blue.Index; //fontcolorblue.IsItalic = true;//下划线 fontcolorblue.Underline = 1; //fontcolorblue.FontName = "微软雅黑"; //m_cellStyle.SetFont(fontcolorblue); break; case stylexls.百分比: m_cellStyle.DataFormat = HSSFDataFormat.GetBuiltinFormat("0.00%"); m_cellStyle.SetFont(m_font); break; case stylexls.中文大写: m_cellStyle.DataFormat = m_datastyle.GetFormat("[DbNum2][$-804]0"); m_cellStyle.SetFont(m_font); break; case stylexls.科学计数法: m_cellStyle.DataFormat = HSSFDataFormat.GetBuiltinFormat("0.00E+00"); m_cellStyle.SetFont(m_font); break; case stylexls.默认: m_cellStyle.SetFont(m_font); break; } return m_cellStyle; } catch { return m_cellStyle; } } #endregion }
创建的表格的效果如图所示:
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持脚本之家。