104 lines
3.4 KiB
C#
104 lines
3.4 KiB
C#
using NPOI.SS.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 YiDa_WinForm.Utils
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{
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/// <summary>
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/// Excel 解析工具类
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/// </summary>
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public static class ExcelHelper
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{
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/// <summary>
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/// 读取Excel文件转换为DataTable
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/// </summary>
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/// <param name="filePath">Excel文件路径</param>
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/// <returns>解析后的DataTable</returns>
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public static DataTable GetExcelToDataTable(string filePath)
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{
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if (string.IsNullOrEmpty(filePath) || !File.Exists(filePath))
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{
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throw new FileNotFoundException("Excel文件不存在", filePath);
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}
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IWorkbook workbook = null;
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FileStream fileStream = null;
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try
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{
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fileStream = File.Open(filePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
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workbook = WorkbookFactory.Create(fileStream);
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DataTable dt = new DataTable();
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// 读取第一个Sheet（适配你的业务场景，如需多Sheet可扩展）
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ISheet sheet = workbook.GetSheetAt(0);
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if (sheet == null) return dt;
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// 读取表头构建DataTable列
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IRow headerRow = sheet.GetRow(0);
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if (headerRow == null) return dt;
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for (int i = 0; i < headerRow.LastCellNum; i++)
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{
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string columnName = headerRow.GetCell(i)?.ToString() ?? $"列{i + 1}";
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dt.Columns.Add(columnName);
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}
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// 读取数据行
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for (int rowIndex = 1; rowIndex <= sheet.LastRowNum; rowIndex++)
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{
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IRow dataRow = sheet.GetRow(rowIndex);
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if (dataRow == null) continue;
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DataRow dr = dt.NewRow();
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for (int colIndex = 0; colIndex < headerRow.LastCellNum; colIndex++)
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{
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ICell cell = dataRow.GetCell(colIndex);
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dr[colIndex] = GetCellValue(cell);
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}
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dt.Rows.Add(dr);
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}
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return dt;
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}
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finally
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{
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// 手动释放资源
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if (fileStream != null)
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{
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fileStream.Close();
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fileStream.Dispose();
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}
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workbook = null;
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}
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}
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/// <summary>
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/// 获取Excel单元格的值（处理不同单元格类型）
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/// </summary>
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private static string GetCellValue(ICell cell)
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{
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if (cell == null) return string.Empty;
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switch (cell.CellType)
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{
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case CellType.Numeric:
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if (DateUtil.IsCellDateFormatted(cell))
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{
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return cell.DateCellValue.ToString();
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}
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else
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{
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return cell.NumericCellValue.ToString();
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}
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case CellType.String:
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return cell.StringCellValue;
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case CellType.Boolean:
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return cell.BooleanCellValue.ToString();
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default:
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return cell.ToString();
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}
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}
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}
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} |