ExcelDataReader 只能从 NPOI 生成的 Excel 中读取第一列（标题/数据）。
例如下面的代码，它只会读取第一列“111”和数据“444”
嗯，任何想法都很好，提前谢谢。
一个奇怪的部分是 excel.exe (2019) 保存后文件大小会发生变化。 4KB -> 10KB，不知道为什么。 *然后，ExcelDataReader 就可以完全读取该文件。
HSSFWorkbook(.xls) 也可以，希望我只丢失了很少的部分？
写：
XSSFWorkbook EWorkbook = new XSSFWorkbook();
XSSFSheet ESheet1 = (XSSFSheet)EWorkbook.CreateSheet("Test");
XSSFRow ERow = (XSSFRow)ESheet1.CreateRow(0);
XSSFCell ECell = (XSSFCell)ERow.CreateCell(0); ECell.SetCellValue("111");
ECell = (XSSFCell)ERow.CreateCell(1); ECell.SetCellValue("222");
ECell = (XSSFCell)ERow.CreateCell(2); ECell.SetCellValue("333");
ERow = (XSSFRow)ESheet1.CreateRow(1);
ECell = (XSSFCell)ERow.CreateCell(0); ECell.SetCellValue("444");
ECell = (XSSFCell)ERow.CreateCell(1); ECell.SetCellValue("555");
ECell = (XSSFCell)ERow.CreateCell(2); ECell.SetCellValue("666");
using (var file2 = new FileStream(@"C:\inetpub\temp.xlsx", FileMode.Create, FileAccess.ReadWrite))
{
EWorkbook.Write(file2);
file2.Close();
}
阅读：
excelSpreadSheet = Excel.ExcelReaderFactory.CreateOpenXmlReader(fs);
以下显示如何使用 Nuget 包 NPOI (v2.6.2) 创建 .xlsx 文件，然后使用 Nuget 包 ExcelDataReader (v3.6.0) 和 ExcelDataReader.DataSet (v3.6.0) 读取该文件。它已使用 Windows 窗体应用程序 (.NET Framework) v4.8 进行了测试。
先决条件：下载并安装上述 Nuget 软件包。
使用 NPOI 创建 Excel (.xlsx) 文件。
助手NPOI：
using System;
using System.Collections.Generic;
using System.IO;
using NPOI;
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;
namespace ExcelNPOITest
{
public class SpreadSheetData
{
public List<SpreadSheetRow> Rows = new List<SpreadSheetRow>();
}
public class SpreadSheetRow
{
public List<SpreadSheetCell> Cells { get; set; } = new List<SpreadSheetCell>();
}
public class SpreadSheetCell
{
public object CellValue { get; set; }
}
public class HelperNPOI
{
public static void CreateExcel(string filename, SpreadSheetData data)
{
using (IWorkbook workbook = new XSSFWorkbook())
{
//create sheet
ISheet sheet1 = workbook.CreateSheet("Sheet1");
//add data to sheet
if (data != null)
{
//0-based indices
for (int i = 0; i < data.Rows.Count; i++)
{
//create row
IRow row = sheet1.CreateRow(i);
for (int j = 0; j < data.Rows[i].Cells.Count; j++)
{
ICell cell = row.CreateCell(j);
//set cell value
if (data.Rows[i].Cells[j].CellValue.GetType() == typeof(bool))
cell.SetCellValue((bool)data.Rows[i].Cells[j].CellValue);
else if (data.Rows[i].Cells[j].CellValue.GetType() == typeof(DateTime))
cell.SetCellValue((DateTime)data.Rows[i].Cells[j].CellValue);
else if (data.Rows[i].Cells[j].CellValue.GetType() == typeof(double))
cell.SetCellValue((double)data.Rows[i].Cells[j].CellValue);
else if (data.Rows[i].Cells[j].CellValue.GetType() == typeof(int))
cell.SetCellValue((int)data.Rows[i].Cells[j].CellValue);
else if (data.Rows[i].Cells[j].CellValue.GetType() == typeof(string))
cell.SetCellValue((string)data.Rows[i].Cells[j].CellValue);
}
using (FileStream fs = new FileStream(filename, FileMode.Create, FileAccess.ReadWrite))
{
//save workbook
workbook.Write(fs);
}
}
}
}
}
}
}
用法：
private void CreateExcelFile(string filename)
{
//create new instance
SpreadSheetData data = new SpreadSheetData();
//add test data
data.Rows.Add(new SpreadSheetRow()
{
Cells = new List<SpreadSheetCell> {
new SpreadSheetCell() { CellValue = "Row 1 Cell 1" },
new SpreadSheetCell() { CellValue = "Row 1 Cell 2" },
new SpreadSheetCell() { CellValue = "Row 1 Cell 3" }
}
});
data.Rows.Add(new SpreadSheetRow()
{
Cells = new List<SpreadSheetCell> {
new SpreadSheetCell() { CellValue = "Row 2 Cell 1" },
new SpreadSheetCell() { CellValue = "Row 2 Cell 2" },
new SpreadSheetCell() { CellValue = "Row 2 Cell 3" }
}
});
HelperNPOI.CreateExcel(filename, data);
}
使用 ExcelDataReader 读取 Excel (.xlsx) 文件
HelperExcelDataReader：
using ExcelDataReader;
using System.Data;
using System.IO;
using System.Diagnostics;
namespace ExcelNPOITest
{
public class HelperExcelDataReader
{
public static DataSet ReadDataFromExcelFile(string filename)
{
DataSet dataSet = new DataSet();
using (FileStream fs = new FileStream(filename, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
{
//create new instance
IExcelDataReader excelDataReader = ExcelDataReader.ExcelReaderFactory.CreateReader(fs);
//get data
dataSet = excelDataReader.AsDataSet(new ExcelDataSetConfiguration()
{
UseColumnDataType = false,
ConfigureDataTable = (tableReader) => new ExcelDataTableConfiguration()
{
UseHeaderRow = false
}
});
//var dataTable = dataSet.Tables[0];
}
return dataSet;
}
}
}
用法：
private void DisplayDataSet(string filename)
{
DataSet ds = HelperExcelDataReader.ReadDataFromExcelFile(filename);
if (ds != null)
{
//option 1
foreach (DataRow row in ds.Tables[0].Rows)
{
foreach (var value in row.ItemArray)
{
Debug.WriteLine("{0}, {1}", value, value.GetType());
}
}
/*
//option 2
for (int i = 0; i < ds.Tables.Count; i++)
{
Debug.WriteLine($"DataTable: {ds.Tables[i].TableName}");
for (int rowIndex = 0; rowIndex < ds.Tables[i].Rows.Count; rowIndex++)
{
Debug.Write($"row[{rowIndex}]: ");
for (int columnIndex = 0; columnIndex < ds.Tables[i].Columns.Count; columnIndex++)
{
Debug.Write($"\"{ds.Tables[i].Rows[rowIndex][columnIndex].ToString()}\" ");
}
Debug.WriteLine("");
}
Debug.WriteLine("");
}
*/
}
}
输出：
Row 1 Cell 1, System.String
Row 1 Cell 2, System.String
Row 1 Cell 3, System.String
Row 2 Cell 1, System.String
Row 2 Cell 2, System.String
Row 2 Cell 3, System.String
资源：