144 lines
6.0 KiB
C#
144 lines
6.0 KiB
C#
using NPOI.HSSF.UserModel;
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using NPOI.SS.Formula.Constant;
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using NPOI.SS.UserModel;
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using NPOI.XSSF.UserModel;
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using System;
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using System.Data;
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using System.IO;
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namespace CaeKnowledge
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{
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public class NpoiExcelImportHelper
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{
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private static NpoiExcelImportHelper _excelImportHelper;
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public static NpoiExcelImportHelper Self
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{
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get => _excelImportHelper ?? (_excelImportHelper = new NpoiExcelImportHelper());
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set => _excelImportHelper = value;
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}
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/// <summary>
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/// 读取excel表格中的数据,将Excel文件流转化为dataTable数据源
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/// 默认第一行为标题
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/// </summary>
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/// <param name="stream">excel文档文件流</param>
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/// <param name="fileType">文档格式</param>
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/// <param name="isSuccess">是否转化成功</param>
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/// <param name="resultMsg">转换结果消息</param>
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/// <returns></returns>
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public DataTable ExcelToDataTable(Stream stream, string fileType, out bool isSuccess, out string resultMsg)
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{
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isSuccess = false;
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resultMsg = "Excel文件流成功转化为DataTable数据源";
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var excelToDataTable = new DataTable();
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try
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{
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// Workbook对象代表一个工作簿,首先定义一个Excel工作薄
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IWorkbook workbook;
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// XSSFWorkbook 适用XLSX格式，HSSFWorkbook 适用XLS格式
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#region 判断Excel版本
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switch (fileType)
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{
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//.XLSX是07版(或者07以上的)的Office Excel
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case ".xlsx":
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workbook = new XSSFWorkbook(stream);
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break;
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//.XLS是03版的Office Excel
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case ".xls":
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workbook = new HSSFWorkbook(stream);
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break;
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default:
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throw new Exception("Excel文档格式有误");
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}
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#endregion 判断Excel版本
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var sheet = workbook.GetSheetAt(0);
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// var rows = sheet.GetRowEnumerator();
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var headerRow = sheet.GetRow(0);
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int cellCount = headerRow.LastCellNum;//最后一行列数（即为总列数）
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//获取第一行标题列数据源,转换为dataTable数据源的表格标题名称
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for (var j = 0; j < cellCount; j++)
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{
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var cell = headerRow.GetCell(j);
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DataColumn column = excelToDataTable.Columns.Add(cell.ToString());
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if (j == 0)
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{
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column.Unique = true;
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}
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}
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//获取Excel表格中除标题以为的所有数据源，转化为dataTable中的表格数据源
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for (var i = sheet.FirstRowNum + 1; i <= sheet.LastRowNum; i++)
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{
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var dataRow = excelToDataTable.NewRow();
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var row = sheet.GetRow(i);
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if (row == null) continue; //没有数据的行默认是null
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for (int j = row.FirstCellNum; j < cellCount; j++)
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{
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if (row.GetCell(j) != null)//单元格内容非空验证
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{
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#region NPOI获取Excel单元格中不同类型的数据
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//获取指定的单元格信息
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var cell = row.GetCell(j);
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switch (cell.CellType)
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{
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//首先在NPOI中数字和日期都属于Numeric类型
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//通过NPOI中自带的DateUtil.IsCellDateFormatted判断是否为时间日期类型
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case CellType.Numeric when DateUtil.IsCellDateFormatted(cell):
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dataRow[j] = cell.DateCellValue;
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break;
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case CellType.Numeric:
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//其他数字类型
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dataRow[j] = cell.NumericCellValue;
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break;
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//空数据类型
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case CellType.Blank:
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dataRow[j] = "";
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break;
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//公式类型
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case CellType.Formula:
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{
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IFormulaEvaluator eva = ".xlsx" == fileType ? (IFormulaEvaluator)new XSSFFormulaEvaluator(workbook) : new HSSFFormulaEvaluator(workbook);
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dataRow[j] = eva.Evaluate(cell).StringValue;
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break;
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}
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//布尔类型
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case CellType.Boolean:
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dataRow[j] = row.GetCell(j).BooleanCellValue;
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break;
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//错误
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case CellType.Error:
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dataRow[j] = ErrorConstant.ValueOf(row.GetCell(j).ErrorCellValue);
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break;
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//其他类型都按字符串类型来处理（未知类型CellType.Unknown，字符串类型CellType.String）
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default:
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dataRow[j] = cell.StringCellValue;
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break;
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}
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#endregion
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}
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}
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excelToDataTable.Rows.Add(dataRow);
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}
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isSuccess = true;
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}
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catch (Exception e)
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{
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resultMsg = e.Message;
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}
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return excelToDataTable;
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}
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}
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}
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