C#导入Excel数据（简单）

备注：
Demo项目创建的控制器为.NET Core3.1框架

1、控制台应用程序代码

using System;
using System.IO;namespace Excel_Import
{class Program{static void Main(string[] args){Console.WriteLine("开始执行导入Excel程序");var filePath = @"D:\Test\TestExcel.xlsx";using (FileStream fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read)){byte[] bytes = new byte[fileStream.Length];fileStream.Read(bytes, 0, bytes.Length);fileStream.Close();// 把 byte[] 转换成 StreamStream stream = new MemoryStream(bytes);var list = ExcelConvert.ToEntityStreamList<TestExcel>(stream, "TestExcel.xlsx");Console.WriteLine("开始遍历TestExcel");foreach (var item in list){Console.WriteLine($"姓名：{item.Name}；地址：{item.Address}");}Console.WriteLine("遍历TestExcel结束");Console.ReadLine();}}}/// <summary>/// 测试Excel模型/// </summary>public class TestExcel{/// <summary>/// 姓名/// </summary>[ExcelColumn("姓名")]public string Name { get; set; }/// <summary>/// 分组/// </summary>[ExcelColumn("地址")]public string Address { get; set; }}
}

2、帮助类代码

using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;
using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;namespace Excel_Import
{/// <summary>/// Excel帮助类/// </summary>public class ExcelConvert{public static List<T> ToEntityStreamList<T>(Stream stream, string fileName, bool firstRow2Name = true) where T : new(){return ToEntityList<T>(stream, fileName);}/// <summary>/// Excel转换为实体列表【普通】/// </summary>/// <typeparam name="T">实体类</typeparam>/// <param name="fileInfo">文件信息</param>/// <param name="firstRow2Name">第一行是否做为列名,默认为true</param>/// <returns></returns>private static List<T> ToEntityList<T>(Stream stream, string fileName, bool firstRow2Name = true)where T : new(){// 加载ExcelIWorkbook workbook;try{// 格式判断if (fileName.EndsWith(".xlsx")){workbook = new XSSFWorkbook(stream);}else{workbook = new HSSFWorkbook(stream);}// 返回实体集var entities = new List<T>();// 读取第一页ISheet sheet = workbook.GetSheetAt(0);// 遍历所有行IEnumerator rows = sheet.GetRowEnumerator();// 反射实体判断实体行var columns = new List<EntityColumn>();#region 反射实体判断实体行对应Excel文件列// 名称行var excelFirstRow = new List<string>();if (firstRow2Name && rows.MoveNext()){var row = (IRow)rows.Current;for (int i = 0; i <= row.LastCellNum; i++){ICell cell = row.GetCell(i);if (cell == null) excelFirstRow.Add("");else excelFirstRow.Add(cell.ToString());}}// 反射PropertyInfo[] propertys = typeof(T).GetProperties();int propertyIndex = 0;foreach (PropertyInfo property in propertys){object[] excelColumns = property.GetCustomAttributes(typeof(ExcelColumnAttribute), true);if (excelColumns.Length > 0){string like = (excelColumns[0] as ExcelColumnAttribute).DisplayNameLike;int excelIndex = (excelColumns[0] as ExcelColumnAttribute).ExcelIndex;if (!string.IsNullOrEmpty(like)){for (int index = 0; index < excelFirstRow.Count; index++){if (excelFirstRow[index].Contains(like)){columns.Add(new EntityColumn { ColumnName = property.Name, ExcelIndex = index });break;}}}else if (excelIndex > -1){columns.Add(new EntityColumn { ColumnName = property.Name, ExcelIndex = excelIndex });}else{columns.Add(new EntityColumn { ColumnName = property.Name, ExcelIndex = propertyIndex });}}propertyIndex++;}#endregion// 遍历数据行while (rows.MoveNext()){var row = (IRow)rows.Current;var entity = new T();PropertyInfo[] items = entity.GetType().GetProperties();foreach (PropertyInfo property in items){EntityColumn column = columns.FirstOrDefault(t => t.ColumnName == property.Name);if (column != null){ICell cell = row.GetCell(column.ExcelIndex);if (cell == null)//if (column.ExcelIndex - row.FirstCellNum >= row.Cells.Count || column.ExcelIndex - row.FirstCellNum < 0){continue;}Object val = cell.ToString();#region 数据类型转换if (property.PropertyType == typeof(DateTime)){if (cell.CellType == CellType.Numeric){val = cell.DateCellValue;}else{DateTime d;DateTime.TryParse(val.ToString(), out d);val = d;}}else if (property.PropertyType == typeof(string)){val = val.ToString().Trim();}if (property.PropertyType == typeof(Int32)){if (cell.CellType == CellType.Numeric){val = (int)Math.Round(cell.NumericCellValue);}Int32 d;Int32.TryParse(val.ToString(), out d);val = d;}else if (property.PropertyType == typeof(UInt32)){if (cell.CellType == CellType.Numeric){val = Math.Round(cell.NumericCellValue);}UInt32 d;UInt32.TryParse(val.ToString(), out d);val = d;}else if (property.PropertyType == typeof(Int16)){if (cell.CellType == CellType.Numeric){val = Math.Round(cell.NumericCellValue);}Int16 d;Int16.TryParse(val.ToString(), out d);val = d;}else if (property.PropertyType == typeof(UInt16)){if (cell.CellType == CellType.Numeric){val = Math.Round(cell.NumericCellValue);}UInt16 d;UInt16.TryParse(val.ToString(), out d);val = d;}else if (property.PropertyType == typeof(float)){if (cell.CellType == CellType.Numeric){val = cell.NumericCellValue;}float d;float.TryParse(val.ToString(), out d);val = d;}else if (property.PropertyType == typeof(decimal)){if (cell.CellType == CellType.Numeric){val = cell.NumericCellValue;}decimal d;decimal.TryParse(val.ToString(), out d);val = d;}else if (property.PropertyType == typeof(double)){if (cell.CellType == CellType.Numeric){val = cell.NumericCellValue;}else{double d;double.TryParse(val.ToString(), out d);val = d;}}else if (property.PropertyType == typeof(byte)){if (cell.CellType == CellType.Numeric){val = (byte)Convert.ToInt32(cell.NumericCellValue);}else{double d;double.TryParse(val.ToString(), out d);val = (byte)d;}}#endregionproperty.SetValue(entity, val, null);}}entities.Add(entity);}// 返回结果return entities;}catch (Exception ex){}return null;}private class EntityColumn{public string ColumnName { get; set; }public int ExcelIndex { get; set; }}}/// <summary>/// Excel列属性【添加标签对象】/// </summary>public class ExcelColumnAttribute : Attribute{public ExcelColumnAttribute(){ExcelIndex = -1;}public ExcelColumnAttribute(int excelIndex){ExcelIndex = excelIndex;}public ExcelColumnAttribute(string displayNameLike){DisplayNameLike = displayNameLike;}public int ExcelIndex { get; set; }public string DisplayNameLike { get; set; }}}

结果：

Excel说明：
首行必须和定义类（TestExcel）中的标签名一致

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