159 lines
5.3 KiB
C#
159 lines
5.3 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Data;
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using System.Windows.Forms;
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using System.Collections;
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using System.IO;
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using NPOI.HSSF.UserModel;
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using NPOI.SS.UserModel;
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using NPOI.HSSF.Record;
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using WMS.Common;
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using NPOI.XSSF.UserModel;
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namespace WMS.FrmCK
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{
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class NPOIHelper
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{
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private static string GetCellValue(ICell cell)
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{
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if (cell == null)
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return string.Empty;
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switch (cell.CellType)
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{
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case CellType.Blank:
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return string.Empty;
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case CellType.Boolean:
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return cell.BooleanCellValue.ToString();
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case CellType.Error:
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return cell.ErrorCellValue.ToString();
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case CellType.Numeric:
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case CellType.Unknown:
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default:
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return cell.ToString();//This is a trick to get the correct value of the cell. NumericCellValue will return a numeric value no matter the cell value is a date or a number
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case CellType.String:
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return cell.StringCellValue;
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case CellType.Formula:
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try
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{
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HSSFFormulaEvaluator e = new HSSFFormulaEvaluator(cell.Sheet.Workbook);
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e.EvaluateInCell(cell);
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return cell.ToString();
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}
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catch
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{
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return cell.NumericCellValue.ToString();
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}
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}
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}
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public static DataTable Import(OpenFileDialog fileDialog)
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{
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DataTable table = new DataTable();
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Stream excelFileStream;
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try
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{
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excelFileStream = fileDialog.OpenFile();
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}
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catch (IOException e)
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{
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if (e.ToString().Contains("正由另一进程使用"))
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{
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SystemCommon.ShowErrorMessageBox("所选Excel文件处于打开状态，请关闭后重试");
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}
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else
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{
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SystemCommon.ShowErrorMessageBox("文件读取失败");
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}
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return null;
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}
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if (excelFileStream == null)
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{
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excelFileStream.Close();
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SystemCommon.ShowErrorMessageBox("文件读取失败");
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return null;
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}
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//读取excel
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using (excelFileStream)
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{
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IWorkbook workbook = new HSSFWorkbook();
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if (fileDialog.SafeFileName.Substring(fileDialog.SafeFileName.Length - 1, 1) == "s")
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{
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try
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{
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workbook = new HSSFWorkbook(excelFileStream);//xls
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}
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catch (LeftoverDataException)
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{
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SystemCommon.ShowErrorMessageBox("导入失败，请将所选Excel文件另存为一个新的Excel文件后再次导入");
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return null;
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}
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catch (IOException)
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{
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SystemCommon.ShowErrorMessageBox("导入失败，请将所选Excel文件另存为一个新的Excel文件后再次导入");
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return null;
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}
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catch (Exception)
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{
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SystemCommon.ShowErrorMessageBox("导入失败，读取Excel文件时遇到未知错误");
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return null;
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}
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}
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else
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{
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workbook = new XSSFWorkbook(excelFileStream);//xlsx
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}
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ISheet sheet = workbook.GetSheetAt(0);//取第一个表
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IRow headerRow = sheet.GetRow(0);//第一行为标题行
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if (headerRow == null)
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{
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SystemCommon.ShowErrorMessageBox("导入失败，所选Excel没有数据");
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return null;
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}
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int cellCount = headerRow.LastCellNum;//LastCellNum = PhysicalNumberOfCells
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int rowCount = sheet.LastRowNum;//LastRowNum = PhysicalNumberOfRows - 1
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//handling header.
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for (int i = headerRow.FirstCellNum; i < cellCount; i++)
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{
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DataColumn column = new DataColumn(headerRow.GetCell(i).StringCellValue);
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table.Columns.Add(column);
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}
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for (int i = (sheet.FirstRowNum + 1); i <= rowCount; i++)
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{
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IRow row = sheet.GetRow(i);
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DataRow dataRow = table.NewRow();
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if (row != null)
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{
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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)
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{
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dataRow[j] = GetCellValue(row.GetCell(j));
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}
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}
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}
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table.Rows.Add(dataRow);
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}
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}
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return table;
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}
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}
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}
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