本文实例为大家分享了C#使用NPOI读取excel转为DataSet的具体代码，供大家参考，具体内容如下
NPOI读取excel转为DataSet
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/// <summary>/// 读取Execl数据到DataTable(DataSet)中/// </summary>/// <param name="filePath">指定Execl文件路径</param>/// <param name="isFirstLineColumnName">设置第一行是否是列名</param>/// <returns>返回一个DataTable数据集</returns>public static DataSet ExcelToDataSet(string filePath, bool isFirstLineColumnName) { DataSet dataSet = new DataSet(); int startRow = 0; try { using (FileStream fs = File.OpenRead(filePath)) { IWorkbook workbook = null; // 如果是2007+的Excel版本 if (filePath.IndexOf(".xlsx") > 0) { workbook = new XSSFWorkbook(fs); } // 如果是2003-的Excel版本 else if (filePath.IndexOf(".xls") > 0) { workbook = new HSSFWorkbook(fs); } if (workbook != null) { //循环读取Excel的每个sheet，每个sheet页都转换为一个DataTable，并放在DataSet中 for (int p = 0; p < workbook.NumberOfSheets; p++) { ISheet sheet = workbook.GetSheetAt(p); DataTable dataTable = new DataTable(); dataTable.TableName = sheet.SheetName; if (sheet != null) { int rowCount = sheet.LastRowNum;//获取总行数 if (rowCount > 0) { IRow firstRow = sheet.GetRow(0);//获取第一行 int cellCount = firstRow.LastCellNum;//获取总列数 //构建datatable的列 if (isFirstLineColumnName) { startRow = 1;//如果第一行是列名，则从第二行开始读取 for (int i = firstRow.FirstCellNum; i < cellCount; ++i) { ICell cell = firstRow.GetCell(i); if (cell != null) { if (cell.StringCellValue != null) { DataColumn column = new DataColumn(cell.StringCellValue); dataTable.Columns.Add(column); } } } } else { for (int i = firstRow.FirstCellNum; i < cellCount; ++i) { DataColumn column = new DataColumn("column" + (i + 1)); dataTable.Columns.Add(column); } } //填充行 for (int i = startRow; i <= rowCount; ++i) { IRow row = sheet.GetRow(i); if (row == null) continue; DataRow dataRow = dataTable.NewRow(); for (int j = row.FirstCellNum; j < cellCount; ++j) { ICell cell = row.GetCell(j); if (cell == null) { dataRow[j] = ""; } else { //CellType(Unknown = -1,Numeric = 0,String = 1,Formula = 2,Blank = 3,Boolean = 4,Error = 5,) switch (cell.CellType) { case CellType.Blank: dataRow[j] = ""; break; case CellType.Numeric: short format = cell.CellStyle.DataFormat; //对时间格式（2015.12.5、2015/12/5、2015-12-5等）的处理 if (format == 14 || format == 22 || format == 31 || format == 57 || format == 58) dataRow[j] = cell.DateCellValue; else dataRow[j] = cell.NumericCellValue; break; case CellType.String: dataRow[j] = cell.StringCellValue; break; } } } dataTable.Rows.Add(dataRow); } } } dataSet.Tables.Add(dataTable); } } } return dataSet; } catch (Exception ex) { var msg = ex.Message; return null; }} |
Dataset 导出为Excel
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/// <summary>/// 将DataTable(DataSet)导出到Execl文档/// </summary>/// <param name="dataSet">传入一个DataSet</param>/// <param name="Outpath">导出路径（可以不加扩展名，不加默认为.xls）</param>/// <returns>返回一个Bool类型的值，表示是否导出成功</returns>/// True表示导出成功，Flase表示导出失败public static bool DataTableToExcel(DataSet dataSet, string Outpath) { bool result = false; try { if (dataSet == null || dataSet.Tables == null || dataSet.Tables.Count == 0 || string.IsNullOrEmpty(Outpath)) throw new Exception("输入的DataSet或路径异常"); int sheetIndex = 0; //根据输出路径的扩展名判断workbook的实例类型 IWorkbook workbook = null; string pathExtensionName = Outpath.Trim().Substring(Outpath.Length - 5); if (pathExtensionName.Contains(".xlsx")) { workbook = new XSSFWorkbook(); } else if(pathExtensionName.Contains(".xls")) { workbook = new HSSFWorkbook(); } else { Outpath = Outpath.Trim() + ".xls"; workbook = new HSSFWorkbook(); } //将DataSet导出为Excel foreach (DataTable dt in dataSet.Tables) { sheetIndex++; if (dt != null && dt.Rows.Count > 0) { ISheet sheet = workbook.CreateSheet(string.IsNullOrEmpty(dt.TableName) ? ("sheet" + sheetIndex) : dt.TableName);//创建一个名称为Sheet0的表 int rowCount = dt.Rows.Count;//行数 int columnCount = dt.Columns.Count;//列数 //设置列头 IRow row = sheet.CreateRow(0);//excel第一行设为列头 for (int c = 0; c < columnCount; c++) { ICell cell = row.CreateCell(c); cell.SetCellValue(dt.Columns[c].ColumnName); } //设置每行每列的单元格, for (int i = 0; i < rowCount; i++) { row = sheet.CreateRow(i + 1); for (int j = 0; j < columnCount; j++) { ICell cell = row.CreateCell(j);//excel第二行开始写入数据 cell.SetCellValue(dt.Rows[i][j].ToString()); } } } } //向outPath输出数据 using (FileStream fs = File.OpenWrite(Outpath)) { workbook.Write(fs);//向打开的这个xls文件中写入数据 result = true; } return result; } catch (Exception ex) { return false; } } } |
调用方法
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DataSet set = ExcelHelper.ExcelToDataTable("test.xlsx", true);//Excel导入 bool b = ExcelHelper.DataTableToExcel(set, "test2.xlsx");//导出Excel |
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服务器之家。
原文链接：https://blog.csdn.net/qq_42455262/article/details/116191667
