NpoiExcelImportHelper.cs
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using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;
namespace Hh.Mes.Common.Exel
{
/// <summary>
/// 通用NPOI Excel导入数据帮助类
/// https://www.cnblogs.com/Can-daydayup/tag/%E3%80%90Npoi%E3%80%91/
/// https://www.cnblogs.com/knowledgesea/archive/2012/11/16/2772547.html
/// </summary>
public class NpoiExcelImportHelper
{
private static NpoiExcelImportHelper _excelImportHelper;
public static NpoiExcelImportHelper _
{
get => _excelImportHelper ?? (_excelImportHelper = new NpoiExcelImportHelper());
set => _excelImportHelper = value;
}
/// <summary>
/// 读取excel表格中的数据,将Excel文件流转化为dataTable数据源
/// 默认第一行为标题
/// </summary>
/// <param name="stream">excel文档文件流</param>
/// <param name="fileType">文档格式</param>
/// <param name="isSuccess">是否转化成功</param>
/// <param name="resultMsg">转换结果消息</param>
/// <returns></returns>
public Dictionary<string, SysDtAllCls> ExcelToDataTable(Stream stream, string fileType, out bool isSuccess, out string resultMsg)
{
isSuccess = false;
resultMsg = "Excel文件流成功转化为 Dictionary<string, DataTable>数据源";
Dictionary<string, SysDtAllCls> dicDt = null;
try
{
//Workbook对象代表一个工作簿,首先定义一个Excel工作薄
IWorkbook workbook;
//XSSFWorkbook 适用XLSX格式，HSSFWorkbook 适用XLS格式
#region 判断Excel版本
switch (fileType)
{
//.XLSX是07版(或者07以上的)的Office Excel
case ".xlsx":
workbook = new XSSFWorkbook(stream);
break;
//.XLS是03版的Office Excel
case ".xls":
workbook = new HSSFWorkbook(stream);
break;
default:
throw new Exception("Excel文档格式有误");
}
#endregion
int SheetCount = workbook.NumberOfSheets;
dicDt = new Dictionary<string, SysDtAllCls>(SheetCount);
for (int sheetSum = 0; sheetSum < SheetCount; sheetSum++)
{
var sheet = workbook.GetSheetAt(sheetSum);
dicDt.Add(sheet.SheetName, new SysDtAllCls());
dicDt[sheet.SheetName].dtTitle = new DataTable();
dicDt[sheet.SheetName].dtData = new DataTable();
//var rows = sheet.GetRowEnumerator();
var headerRow = sheet.GetRow(0);
if (headerRow == null) continue;
int cellCount = headerRow.LastCellNum;//最后一行列数（即为总列数）
//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
for (var j = 0; j < cellCount; j++)
{
var cell = headerRow.GetCell(j);
dicDt[sheet.SheetName].dtTitle.Columns.Add(cell.ToString());
dicDt[sheet.SheetName].dtData.Columns.Add(cell.ToString());
}
//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
for (var i = sheet.FirstRowNum + 1; i <= sheet.LastRowNum; i++)
{
var dataRowDtData = dicDt[sheet.SheetName].dtData.NewRow();
DataRow dataRowDtTitle = null;
if (i == 1) dataRowDtTitle = dicDt[sheet.SheetName].dtTitle.NewRow();
var row = sheet.GetRow(i);
if (row == null||row.Cells.Count==0) continue; //没有数据的行默认是null
for (int j = row.FirstCellNum; j < cellCount; j++)
{
if (row.GetCell(j) != null)//单元格内容非空验证
{
#region NPOI获取Excel单元格中不同类型的数据
//获取指定的单元格信息
var cell = row.GetCell(j);
switch (cell.CellType)
{
//首先在NPOI中数字和日期都属于Numeric类型
//通过NPOI中自带的DateUtil.IsCellDateFormatted判断是否为时间日期类型
case CellType.Numeric when DateUtil.IsCellDateFormatted(cell):
if (i == 1)
{
dataRowDtTitle[j] = cell.DateCellValue;
}
else
{
dataRowDtData[j] = cell.DateCellValue;
}
break;
//其他数字类型
case CellType.Numeric:
if (i == 1)
{
dataRowDtTitle[j] = cell.DateCellValue;
}
else
{
dataRowDtData[j] = cell.NumericCellValue;
}
break;
//空数据类型
case CellType.Blank:
if (i == 1)
{
dataRowDtTitle[j] = "";
}
else
{
dataRowDtData[j] = "";
}
break;
//公式类型
case CellType.Formula:
{
HSSFFormulaEvaluator eva = new HSSFFormulaEvaluator(workbook);
if (i == 1)
{
dataRowDtTitle[j] = eva.Evaluate(cell).StringValue;
}
else
{
dataRowDtData[j] = eva.Evaluate(cell).StringValue;
}
break;
}
//布尔类型
case CellType.Boolean:
if (i == 1)
{
dataRowDtTitle[j] = row.GetCell(j).BooleanCellValue;
}
else
{
dataRowDtData[j] = row.GetCell(j).BooleanCellValue;
}
break;
//错误
case CellType.Error:
if (i == 1)
{
dataRowDtTitle[j] = row.GetCell(j).ErrorCellValue;
}
else
{
dataRowDtData[j] = row.GetCell(j).ErrorCellValue;
}
break;
//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）
default:
if (i == 1)
{
dataRowDtTitle[j] = cell.StringCellValue;
}
else
{
dataRowDtData[j] = cell.StringCellValue;
}
break;
}
#endregion
}
}
//除去DataTable中的空行
bool IsNull = true;
for (int j = 0; j < dataRowDtData.ItemArray.Length; j++)
{
if (!string.IsNullOrEmpty(dataRowDtData.ItemArray[j].ToString().Trim()))
{
IsNull = false;
}
}
if (i == 1) dicDt[sheet.SheetName].dtTitle.Rows.Add(dataRowDtTitle);
if (!IsNull) dicDt[sheet.SheetName].dtData.Rows.Add(dataRowDtData);
}
isSuccess = true;
}
}
catch (Exception e)
{
resultMsg = e.Message;
}
return dicDt;
}
public class SysDtAllCls
{
/// <summary>
/// dt 表头 中文 用于校验验证
/// </summary>
public DataTable dtTitle { get; set; }
/// <summary>
/// 数据源
/// </summary>
public DataTable dtData { get; set; }
}
}
}