.NET/C# — EXCEL文件内容添加到数据库中

我这里使用的是Sql Server数据库
EXCEL文件里面的标题字段必须和代码写的字段一样否则查找不到该字段
数据库字段的限制：比如说你的数据库有5个字段，但是插入数据时候EXCEL只有四个字段，那么空的那个字段，一定要允许为空哦！！否则会插不进去的！！
大家只需要修改参数和引用，其他逻辑方法不用修改，如果您有把握可以修改再修改
如果您修改完参数和数据后还有方法报错，应该是您没有引用方法的命名空间，如有其他方法缺少请下方留言或私我我会更新
还是以我的练习数据库为例已下为大家详细展示

1、首先大家要有一个上传文件委托配置的类，大家可以新建一个类，名字大家自己取，类里面的代码内容我给大家写到了下方直接复制粘贴即可！不需要做更改直接贴！！，记得添加引用！！

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.IO;
using System.Runtime.CompilerServices;namespace ARC.Common.Help
{/// <summary>/// 上传文件委托配置类，配置的委托将用于全局/// </summary>public class UploadHelp{/// <summary>/// 文件上传本地路径委托/// </summary>private static Func<byte[], string, UploadFileType, string> func = null;/// <summary>/// 文件上传Azure委托/// </summary>private static Func<byte[], string, UploadFileType, string> funcBlob = null;/// <summary>/// 分片上传--云存储/// </summary>private static Func<byte[], string, UploadFileType, string> _funcBlobBlack = null;/// <summary>/// 分片上传--本地/// </summary>private static Func<byte[], string, UploadFileType, string> _funcLocationBlack = null;/// <summary>/// 合并分片--云存储/// </summary>private static Func<List<string>, string, string, UploadFileType, string> _mergeBlobBlack = null;/// <summary>/// 合并分片--本地/// </summary>private static Func<List<string>, string, string, UploadFileType, string> _mergeLocationBlack = null;#region 文件流操作private static Func<Stream, string, UploadFileType, string> funcBlobStream = null;/// <summary>/// 文件上传本地路径委托/// </summary>private static Func<Stream, string, UploadFileType, string> funcStream = null;/// <summary>/// 分片上传--云存储/// </summary>private static Func<Stream, string, UploadFileType, string> _funcBlobBlackStream = null;/// <summary>/// 分片上传--本地/// </summary>private static Func<Stream, string, UploadFileType, string> _funcLocationBlackStream = null;#endregion/// <summary>/// 默认上传方式/// </summary>private static UploadFunEnum defaultFuncEnum;/// <summary>/// 默认分片上传方式/// </summary>private static UploadFunEnum defaultBlackEnum;#region 二进制流/// <summary>/// 初始化委托/// </summary>/// <param name="_func"></param>public static void Init(Func<byte[], string, UploadFileType, string> _func, UploadFunEnum funcEnum = UploadFunEnum.location){switch (funcEnum){case UploadFunEnum.location:func = _func;break;case UploadFunEnum.blob:funcBlob = _func;break;case UploadFunEnum.LocationBlack:_funcLocationBlack = _func;break;case UploadFunEnum.BlobBlack:_funcBlobBlack = _func;break;case UploadFunEnum.defalut:break;}}/// <summary>/// 初始化默认上传方式/// </summary>/// <param name="_defaultFuncEnum"></param>public static void InitDefaultUpload(UploadFunEnum _defaultFuncEnum){defaultFuncEnum = _defaultFuncEnum;//是否为云存储，非云存储直接使用初始化本地分片上传defaultBlackEnum = _defaultFuncEnum == UploadFunEnum.blob ? UploadFunEnum.BlobBlack : UploadFunEnum.LocationBlack;}/// <summary>/// 通过委托上传文件/// </summary>/// <param name="bytes">字节数组</param>/// <param name="fileName">文件名</param>/// <param name="fileType">文件类型</param>/// <returns></returns>public static string Execute(byte[] bytes, string fileName, UploadFileType fileType, UploadFunEnum funcEnum = UploadFunEnum.defalut){var funcBytes = funcEnum switch{UploadFunEnum.blob => funcBlob,UploadFunEnum.location => func,_ => defaultBlackEnum == UploadFunEnum.location ? func : funcBlob};if (funcBytes == null) throw new Exception("请先初始化上传委托");return funcBytes.Invoke(bytes, fileName, fileType);}/// <summary>/// 分片上传处理/// </summary>/// <param name="bytes"></param>/// <param name="fileDir"></param>/// <param name="fileType"></param>/// <param name="funEnum"></param>/// <returns></returns>public static string ExecuteBlack(byte[] bytes, string fileDir, UploadFileType fileType, UploadFunEnum funEnum = UploadFunEnum.defalut){funEnum = funEnum == UploadFunEnum.defalut ? defaultBlackEnum : funEnum;if (funEnum != UploadFunEnum.BlobBlack && funEnum != UploadFunEnum.LocationBlack){return Execute(bytes, fileDir, fileType, funEnum);}if ((funEnum == UploadFunEnum.LocationBlack && (_funcLocationBlack == null || _mergeLocationBlack == null)) ||(funEnum == UploadFunEnum.BlobBlack && (_funcBlobBlack == null || _mergeBlobBlack == null))){throw new Exception("请先初始化分片上传委托");}var result = string.Empty;if (funEnum == UploadFunEnum.LocationBlack){result = _funcLocationBlack.Invoke(bytes, fileDir, fileType);}else{result = _funcBlobBlack.Invoke(bytes, fileDir, fileType);}return result;}#endregion#region 文件流public static void InitStream(Func<Stream, string, UploadFileType, string> _func, UploadFunEnum funEnum = UploadFunEnum.location){switch (funEnum){case UploadFunEnum.blob:funcBlobStream = _func;break;case UploadFunEnum.location:funcStream = _func;break;case UploadFunEnum.LocationBlack:_funcLocationBlackStream = _func;break;case UploadFunEnum.BlobBlack:_funcBlobBlackStream = _func;break;case UploadFunEnum.defalut:break;}}/// <summary>/// 通过委托上传文件/// </summary>/// <param name="stream">文件流</param>/// <param name="fileName">文件名</param>/// <param name="fileType">文件类型</param>/// <returns></returns>public static string Execute(Stream stream, string fileName, UploadFileType fileType, UploadFunEnum funcEnum = UploadFunEnum.defalut){var func = funcEnum switch{UploadFunEnum.blob => funcBlobStream,UploadFunEnum.location => funcStream,_ => defaultBlackEnum == UploadFunEnum.location ? funcStream : funcBlobStream};if (func == null) throw new Exception("请先初始化上传委托");return func.Invoke(stream, fileName, fileType);}/// <summary>/// 分片上传处理/// </summary>/// <param name="stream"></param>/// <param name="fileDir"></param>/// <param name="fileType"></param>/// <param name="funEnum"></param>/// <returns></returns>public static string ExecuteBlack(Stream stream, string fileDir, UploadFileType fileType, UploadFunEnum funEnum = UploadFunEnum.defalut){funEnum = funEnum == UploadFunEnum.defalut ? defaultBlackEnum : funEnum;if (funEnum != UploadFunEnum.BlobBlack && funEnum != UploadFunEnum.LocationBlack){return Execute(stream, fileDir, fileType, funEnum);}if ((funEnum == UploadFunEnum.LocationBlack && (_funcLocationBlackStream == null || _mergeLocationBlack == null)) ||(funEnum == UploadFunEnum.BlobBlack && (_funcBlobBlackStream == null || _mergeBlobBlack == null))){throw new Exception("请先初始化分片上传委托");}var result = funEnum == UploadFunEnum.LocationBlack? _funcLocationBlackStream.Invoke(stream, fileDir, fileType): _funcBlobBlackStream.Invoke(stream, fileDir, fileType);return result;}#endregion/// <summary>/// 合并分片内容的初始化委托/// </summary>/// <param name="_func"></param>/// <param name="funcEnum"></param>public static void InitMerge(Func<List<string>, string, string, UploadFileType, string> _func, UploadFunEnum funcEnum = UploadFunEnum.LocationBlack){switch (funcEnum){case UploadFunEnum.LocationBlack:_mergeLocationBlack = _func;break;case UploadFunEnum.BlobBlack:_mergeBlobBlack = _func;break;}}/// <summary>/// 合并分片，本地存储开集群的模式下不建议开启分片上传/// </summary>/// <param name="fileDir"></param>/// <param name="fileName"></param>/// <param name="blockList"></param>/// <param name="fileType"></param>/// <param name="funEnum"></param>/// <returns></returns>public static string MergeBlack(string fileDir, string fileName, List<string> blockList, UploadFileType fileType, UploadFunEnum funEnum = UploadFunEnum.defalut){funEnum = funEnum == UploadFunEnum.defalut ? defaultBlackEnum : funEnum;var result = funEnum == UploadFunEnum.LocationBlack? _mergeLocationBlack.Invoke(blockList, fileName, fileDir, fileType): _mergeBlobBlack.Invoke(blockList, fileName, fileDir, fileType);return result;}}/// <summary>/// 文件枚举 /// </summary>public enum UploadFileType{[Description("Face")]Face = 1,[Description("Voice")]Voice = 2,[Description("Image")]Image = 3,[Description("Video")]Video = 4,[Description("File")]File = 5,[Description("QrCode")]QrCode = 6}public enum UploadFunEnum{defalut = 0,location = 1,//本地blob = 2,//Azure云上传/// <summary>/// 本地分片上传/// </summary>LocationBlack = 3,/// <summary>/// 云分片上传/// </summary>BlobBlack = 4}
}

2、需要一个类CovertDataTableHelper，里面有一个方法会用得到，当然大家也可以把这个方法写道其他里面，但是下面调用的时候记得改就行了。

using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Reflection;namespace ARC.Common.Help
{public static class CovertDataTableHelper{public static DataTable ToDataTableTow(IList list){DataTable result = new DataTable();if (list.Count > 0){PropertyInfo[] propertys = list[0].GetType().GetProperties();foreach (PropertyInfo pi in propertys){result.Columns.Add(pi.Name, pi.PropertyType);}for (int i = 0; i < list.Count; i++){ArrayList tempList = new ArrayList();foreach (PropertyInfo pi in propertys){object obj = pi.GetValue(list[i], null);tempList.Add(obj);}object[] array = tempList.ToArray();result.LoadDataRow(array, true);}}return result;}/// <summary>/// 泛型转换list/// </summary>/// <typeparam name="T"></typeparam>/// <param name="list"></param>/// <returns></returns>public static DataTable ToDataTable<T>(IList<T> list){return ToDataTable<T>(list, null);}/// <summary>    /// 将泛型集合类转换成DataTable    /// </summary>    /// <typeparam name="T">集合项类型</typeparam>    /// <param name="list">集合</param>    /// <param name="propertyName">需要返回的列的列名</param>    /// <returns>数据集(表)</returns>    public static DataTable ToDataTable<T>(IList<T> list, params string[] propertyName){List<string> propertyNameList = new List<string>();if (propertyName != null)propertyNameList.AddRange(propertyName);DataTable result = new DataTable();if (list.Count > 0){PropertyInfo[] propertys = list[0].GetType().GetProperties();foreach (PropertyInfo pi in propertys){if (propertyNameList.Count == 0){result.Columns.Add(pi.Name, pi.PropertyType);}else{if (propertyNameList.Contains(pi.Name))result.Columns.Add(pi.Name, pi.PropertyType == typeof(DateTime) ? typeof(string) : pi.PropertyType);}}for (int i = 0; i < list.Count; i++){ArrayList tempList = new ArrayList();foreach (PropertyInfo pi in propertys){if (propertyNameList.Count == 0){object obj = pi.GetValue(list[i], null);tempList.Add(obj);}else{if (propertyNameList.Contains(pi.Name)){object obj = pi.GetValue(list[i], null);tempList.Add(pi.PropertyType == typeof(DateTime) ? (obj == null ? "" : Convert.ToDateTime(obj).ToString("yyyy-MM-dd HH:mm:ss")) : obj);}}}object[] array = tempList.ToArray();result.LoadDataRow(array, true);}}return result;}}
}

3、我们除了上方的那个类之外我们还需要另外一个类，这个类里面是EXCEL导入成DataTable的类，和对EXCEL中表格进行判断等一系列操作的类。名字大家也可以自己取，如果缺少引用一定要添加引用！！（代码我都标有注释大家自己看），同样是直接复制不要嫌长，直接复制粘贴进去就好！！

using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;
using System;
using System.Collections.Generic;
using System.Data;
using System.IO;namespace ARC.Common.Help
{public class ExcelHelper2 : IDisposable{private string fileName = null; //文件名private IWorkbook workbook = null;private FileStream fs = null;private bool disposed;public ExcelHelper2(string fileName){this.fileName = fileName;disposed = false;}#region Data To Excel/// <summary>/// 将DataTable数据导入到excel中/// </summary>/// <param name="data">要导入的数据</param>/// <param name="isColumnWritten">DataTable的列名是否要导入</param>/// <param name="sheetName">要导入的excel的sheet的名称</param>/// <returns>导入数据行数(包含列名那一行)</returns>public int DataTableToExcel(DataTable data, string sheetName, bool isColumnWritten){int i = 0;int j = 0;int count = 0;ISheet sheet = null;fs = new FileStream(fileName, FileMode.OpenOrCreate, FileAccess.ReadWrite);if (fileName.IndexOf(".xlsx") > 0) // 2007版本workbook = new XSSFWorkbook();else if (fileName.IndexOf(".xls") > 0) // 2003版本workbook = new HSSFWorkbook();try{if (workbook != null){sheet = workbook.CreateSheet(sheetName);}else{return -1;}if (isColumnWritten == true) //写入DataTable的列名{IRow row = sheet.CreateRow(0);for (j = 0; j < data.Columns.Count; ++j){row.CreateCell(j).SetCellValue(data.Columns[j].ColumnName);}count = 1;}else{count = 0;}for (i = 0; i < data.Rows.Count; ++i){IRow row = sheet.CreateRow(count);for (j = 0; j < data.Columns.Count; ++j){row.CreateCell(j).SetCellValue(data.Rows[i][j].ToString());}++count;}workbook.Write(fs); //写入到excelreturn count;}catch (Exception ex){Console.WriteLine("Exception: " + ex.Message);return -1;}}/// <summary>/// 将List集合转为Datatable并生成Excel/// </summary>/// <typeparam name="T"></typeparam>/// <param name="List"></param>/// <param name="Headline"></param>/// <param name="sheetName"></param>/// <returns></returns>public int ListToExcel<T>(List<T> List, string[] Headline, string sheetName, string[] cloumns = null, string excelTemplateName = ""){//string[] Headline = { "姓名", "审核状态","签到状态", "签到方式", "邮箱", "手机","城市", "公司", "职位", "性别", "行业", "票号", "报名时间",//    "身份证号" ,"是否14日晚在酒店用餐","是否需要无烟房","是否参加16日拓展活动","身高尺码","ShareRoom","说明","去程日期","去程交通","返程日期","返程交通","更新时间"};//int i = 0;int j = 0;int count = 1;ISheet sheet = null;//加载模板文件路径  FileStream file = new FileStream(excelTemplateName, FileMode.Open, FileAccess.Read);//读入excel模板//HSSF适用2007以前的版本,XSSF适用2007版本及其以上的。//fileHSSFWorkbook workbook = new HSSFWorkbook();//FileStream fs = File.Open(excelTemplateName, FileMode.Open,//FileAccess.Read, FileShare.ReadWrite);//if (fileName.IndexOf(".xlsx") > 0) // 2007版本//    if (string.IsNullOrEmpty(excelTemplateName))//    {//        workbook = new XSSFWorkbook();//    }//    else//    {//        workbook = new XSSFWorkbook(fs);//        fs.Close();//    }//else if (fileName.IndexOf(".xls") > 0) // 2003版本//    workbook = new HSSFWorkbook();try{if (workbook != null){sheet = workbook.GetSheet(sheetName);if (sheet == null){sheet = workbook.CreateSheet(sheetName);}}else{return -1;}DataTable dataTable = CovertDataTableHelper.ToDataTable(List, cloumns);for (int i = 1; i <= List.Count; i++){IRow row = sheet.CreateRow(count);for (j = 0; j < Headline.Length; ++j){row.CreateCell(j).SetCellValue(dataTable.Rows[i - 1][j].ToString());}++count;}FileStream fsnew = new FileStream(fileName, FileMode.Create);workbook.Write(fsnew); //写入到excelreturn count;}catch (Exception ex){Console.WriteLine("Exception: " + ex.Message);return -1;}}#endregion#region Excle To Data/// <summary>/// 将excel中的数据导入到DataTable中/// </summary>/// <param name="sheetName">excel工作薄sheet的名称</param>/// <param name="isFirstRowColumn">第一行是否是DataTable的列名</param>/// <returns>返回的DataTable</returns>public DataTable ExcelToDataTable(string sheetName, bool isFirstRowColumn, int cellnum){ISheet sheet = null;DataTable data = new DataTable();int startRow = 0;try{fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);if (fileName.IndexOf(".xlsx") > 0) // 2007版本workbook = new XSSFWorkbook(fs);else if (fileName.IndexOf(".xls") > 0) // 2003版本workbook = new HSSFWorkbook(fs);if (sheetName != null){sheet = workbook.GetSheet(sheetName);if (sheet == null) //如果没有找到指定的sheetName对应的sheet，则尝试获取第一个sheet{sheet = workbook.GetSheetAt(0);}}else{sheet = workbook.GetSheetAt(0);}if (sheet != null){IRow firstRow = sheet.GetRow(0);//int cellCount = firstRow.LastCellNum; //一行最后一个cell的编号 即总的列数int cellCount = cellnum; //一行最后一个cell的编号 即总的列数if (isFirstRowColumn){for (int i = firstRow.FirstCellNum; i < cellCount; ++i){ICell cell = firstRow.GetCell(i);if (cell != null){string cellValue = cell.StringCellValue;if (cellValue != null){//ItemHelper.WriteTxTLogs("cellValue:" + cellValue);DataColumn column = new DataColumn(cellValue);data.Columns.Add(column);}}}startRow = sheet.FirstRowNum + 1;}else{startRow = sheet.FirstRowNum;}//ItemHelper.WriteTxTLogs("data.Columns.Count:" + data.Columns.Count);//最后一列的标号int rowCount = sheet.LastRowNum;for (int i = startRow; i <= rowCount; ++i){bool result = false;IRow row = sheet.GetRow(i);if (row == null) continue; //没有数据的行默认是null　　　　DataRow dataRow = data.NewRow();//读取每列for (int j = row.FirstCellNum; j < cellCount; j++){ICell cell = row.GetCell(j); //一个单元格dataRow[j] = GetCellValue(cell); //获取单元格的值//全为空则不取if (dataRow[j].ToString() != ""){result = true;}}if (result == true){data.Rows.Add(dataRow); //把每行追加到DataTable}}}return data;}catch (Exception ex){Console.WriteLine("Exception: " + ex.Message);return null;}}//对单元格进行判断取值private static string GetCellValue(ICell cell){if (cell == null)return string.Empty;switch (cell.CellType){case CellType.Blank: //空数据类型 这里类型注意一下，不同版本NPOI大小写可能不一样,有的版本是Blank（首字母大写)return string.Empty;case CellType.Boolean: //bool类型return cell.BooleanCellValue.ToString();case CellType.Error:return cell.ErrorCellValue.ToString();case CellType.Numeric: //数字类型if (HSSFDateUtil.IsCellDateFormatted(cell))//日期类型{return cell.DateCellValue.ToString();}else //其它数字{return cell.NumericCellValue.ToString();}case CellType.Unknown: //无法识别类型default: //默认类型return cell.ToString();//case CellType.String: //string 类型return cell.StringCellValue;case CellType.Formula: //带公式类型try{HSSFFormulaEvaluator e = new HSSFFormulaEvaluator(cell.Sheet.Workbook);e.EvaluateInCell(cell);return cell.ToString();}catch{return cell.NumericCellValue.ToString();}}}/// <summary>/// 将excel中的数据导入到DataTable中/// </summary>/// <param name="sheetName">excel工作薄sheet的名称</param>/// <param name="isFirstRowColumn">第一行是否是DataTable的列名</param>/// <returns>返回的DataTable</returns>public DataTable ExcelToDataTable(string sheetName, bool isFirstRowColumn){ISheet sheet = null;DataTable data = new DataTable();int startRow = 0;try{fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);if (fileName.IndexOf(".xlsx") > 0) // 2007版本workbook = new XSSFWorkbook(fs);else if (fileName.IndexOf(".xls") > 0) // 2003版本workbook = new HSSFWorkbook(fs);if (sheetName != null){sheet = workbook.GetSheet(sheetName);if (sheet == null) //如果没有找到指定的sheetName对应的sheet，则尝试获取第一个sheet{sheet = workbook.GetSheetAt(0);}}else{sheet = workbook.GetSheetAt(0);}if (sheet != null){IRow firstRow = sheet.GetRow(0);int cellCount = firstRow.LastCellNum; //一行最后一个cell的编号 即总的列数if (isFirstRowColumn){for (int i = firstRow.FirstCellNum; i < cellCount; ++i){ICell cell = firstRow.GetCell(i);if (cell != null){string cellValue = cell.StringCellValue;if (cellValue != null){DataColumn column = new DataColumn(cellValue);data.Columns.Add(column);}}}startRow = sheet.FirstRowNum + 1;}else{startRow = sheet.FirstRowNum;}//最后一列的标号int rowCount = sheet.LastRowNum;for (int i = startRow; i <= rowCount; ++i){IRow row = sheet.GetRow(i);if (row == null) continue; //没有数据的行默认是null　　　　　　　DataRow dataRow = data.NewRow();for (int j = row.FirstCellNum; j < cellCount; ++j){if (row.GetCell(row.FirstCellNum) != null && row.GetCell(row.FirstCellNum).ToString() != ""){if (row.GetCell(j) != null) //同理，没有数据的单元格都默认是null{dataRow[j] = row.GetCell(j).ToString();}}else{dataRow[j] = "";//return data;}}data.Rows.Add(dataRow);}}return data;}catch (Exception ex){Console.WriteLine("Exception: " + ex.Message);return null;}}/// <summary>/// 将excel中的数据导入到DataTable中/// </summary>/// <param name="sheetName">excel工作薄sheet的名称</param>/// <param name="isFirstRowColumn">第一行是否是DataTable的列名</param>/// <param name="isHaveTableTips">是否有提示行</param>/// <returns>返回的DataTable</returns>public DataTable ExcelToDataTable2(string sheetName, bool isFirstRowColumn, bool isHaveTableTips){ISheet sheet = null;DataTable data = new DataTable();int startRow = 0;try{fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);if (fileName.IndexOf(".xlsx") > 0) // 2007版本workbook = new XSSFWorkbook(fs);else if (fileName.IndexOf(".xls") > 0) // 2003版本workbook = new HSSFWorkbook(fs);if (sheetName != null){sheet = workbook.GetSheet(sheetName);if (sheet == null) //如果没有找到指定的sheetName对应的sheet，则尝试获取第一个sheet{sheet = workbook.GetSheetAt(0);}}else{//获取第一个sheetsheet = workbook.GetSheetAt(0);}if (sheet != null){//获取第一行,isHaveTableTips 若有提示行 +1IRow firstRow = isHaveTableTips ? sheet.GetRow(1) : sheet.GetRow(0);int cellCount = firstRow.LastCellNum; //一行最后一个cell的编号 即总的列数if (isFirstRowColumn){//创建列for (int i = firstRow.FirstCellNum; i < cellCount; ++i){ICell cell = firstRow.GetCell(i);cell.SetCellType(CellType.String);if (cell != null){string cellValue = cell.StringCellValue;if (cellValue != null){if (data.Columns.Contains(cellValue)){cellValue = cellValue + i;}DataColumn column = new DataColumn(cellValue);data.Columns.Add(column);}}}startRow = isHaveTableTips ? sheet.FirstRowNum + 2 : sheet.FirstRowNum + 1;}else{startRow = isHaveTableTips ? sheet.FirstRowNum + 1 : sheet.FirstRowNum;}//最后一列的标号int rowCount = sheet.LastRowNum;//读取每行,从第二行起for (int i = startRow; i <= rowCount; ++i){bool result = false;//获取当前行IRow row = sheet.GetRow(i);if (row == null) continue; //没有数据的行默认是null　　　　　　　DataRow dataRow = data.NewRow();//读取每列//for (int j = row.FirstCellNum; j < cellCount; ++j)//{//    if (row.GetCell(j) != null) //同理，没有数据的单元格都默认是null//        if (row.GetCell(j).CellType == CellType.Numeric)//        {//            if (HSSFDateUtil.IsCellDateFormatted(row.GetCell(j)))//            {//                dataRow[j] = row.GetCell(j).DateCellValue;//            }//            else//            {//                dataRow[j] = row.GetCell(j).NumericCellValue;//            }//        }//        else//        {//            dataRow[j] = row.GetCell(j).ToString();//        }//}//data.Rows.Add(dataRow);//读取每列for (int j = row.FirstCellNum; j < cellCount; j++){ICell cell = row.GetCell(j); //一个单元格dataRow[j] = GetCellValue(cell); //获取单元格的值//全为空则不取if (!string.IsNullOrEmpty(dataRow[j].ToString())){result = true;}}if (result == true){data.Rows.Add(dataRow); //把每行追加到DataTable}}}return data;}catch (Exception ex){Console.WriteLine("Exception: " + ex.Message);return null;}}#endregion#region Excel Helper/// <summary>/// 获取Cell样式/// </summary>/// <param name="wk"></param>/// <param name="fontfamily"></param>/// <param name="fontcolor"></param>/// <param name="fontsize"></param>/// <param name="bgColor"></param>/// <returns></returns>public static ICellStyle GetCellStyle(IWorkbook workbook, string fontfamily, short fontcolor, int fontsize, short bgColor){ICellStyle cellstyle = workbook.CreateCellStyle();cellstyle.SetFont(GetFontStyle(workbook, fontfamily, fontcolor, fontsize));cellstyle.FillPattern = FillPattern.SolidForeground;cellstyle.FillForegroundColor = bgColor;cellstyle.VerticalAlignment = VerticalAlignment.Top;return cellstyle;}/// <summary>/// Excel字体样式/// </summary>/// <param name="hssfworkbook"></param>/// <param name="fontfamily"></param>/// <param name="fontcolor"></param>/// <param name="fontsize"></param>/// <returns></returns>public static IFont GetFontStyle(IWorkbook hssfworkbook, string fontfamily, short fontcolor, int fontsize){IFont font1 = hssfworkbook.CreateFont();if (string.IsNullOrEmpty(fontfamily)){font1.FontName = fontfamily;}if (fontcolor != null){font1.Color = fontcolor;}font1.IsItalic = false;font1.Boldweight = (short)FontBoldWeight.Bold;font1.FontHeightInPoints = (short)fontsize;return font1;}public void Dispose(){Dispose(true);GC.SuppressFinalize(this);}protected virtual void Dispose(bool disposing){if (!this.disposed){if (disposing){if (fs != null)fs.Close();}fs = null;disposed = true;}}#endregion}
}

4、接下来我们就可以再我们的控制器中写接口方法了，上面的两个类缺一不可不要嫌长，直接复制就好，基本不用做修改只需添加引用即可！！！

首先我们需要封装一个获取文件后缀名的方法，非常简单：

private string GetFileExtension(string fileName){//从指定字符开始看是否大于0if (fileName.IndexOf(".") > 0){//从点开始取但是不包括这个点          获取.最后一次出现的位置return fileName.Substring(fileName.LastIndexOf("."));}return "";}

其次我们开始写主方法，返回类型是上面的返回类型库里面的哦。上面那个方法必须写哦！否则在主方法里面用不了！！：

[HttpPost]public string ImportXls(){var t = UploadFileType.File;var files = HttpContext.Request.Form.Files;if (files.Count > 0){var fileFile = files[0];if (fileFile != null){string ext = GetFileExtension(fileFile.FileName);if (!(ext.ToLower() == ".xls" || ext.ToLower() == ".xlsx")){//return ApiRespHelp.getError(-100, "文件格式不允许");return "文件格式不允许";}}if (fileFile.FileName != ""){string nameStr = Guid.NewGuid().ToString();string newFileName = $"{nameStr}{GetFileExtension(fileFile.FileName)}";string fileDir = $"{AppDomain.CurrentDomain.BaseDirectory}/{AppConfig.UploadConfig.Directory}/{t.ToString()}";if (!Directory.Exists(fileDir)){Directory.CreateDirectory(fileDir);}string resourcepath = Path.Combine(fileDir, newFileName);var fileBytes = StreamToBytes(fileFile.OpenReadStream());System.IO.File.WriteAllBytes(resourcepath, fileBytes);ExcelHelper2 help = new ExcelHelper2(resourcepath);var dt = help.ExcelToDataTable("sheet1", true);try{if (dt != null && dt.Rows.Count > 0){//邮箱var emails = (from DataRow item in dt.Rowsgroup item by item["邮箱"] into itemKeyselect itemKey.Key.ToString()).ToList();emails = (from email in emails where !string.IsNullOrEmpty(email) select email).ToList();//手机号var mobiles = (from DataRow item in dt.Rowsgroup item by item["电话"] into itemKeyselect itemKey.Key.ToString()).ToList();mobiles = (from mobile in mobiles where !string.IsNullOrEmpty(mobile) select mobile).ToList();if (emails.Count < 1){return "文件内不存在邮箱，无法导入";}if (mobiles.Count < 1){                               return "文件内不存在手机号，无法导入";}var regUser = new List<User_tb>();using (var dbContext = new MADbContext()){//邮箱var userEmails = dbContext.User_tbs.Where(m => emails.Contains(m.Email) && m.userid != -1).GroupBy(m => m.Email).Select(m => m.Key.ToLower()).ToList();//手机号var userMobile = dbContext.User_tbs.Where(m => mobiles.Contains(m.Telephone) && m.userid!= -1).GroupBy(m => m.Telephone).Select(m => m.Key).ToList();//邮箱重复int repeatCount = 0;int repeatNullCount = 0;string repeatInfo = string.Empty;int i = 1;foreach (DataRow item in dt.Rows){//记录循环次数i++;//判断里面的数据是不是空的if (string.IsNullOrEmpty(item["用户ID"].ToString())){repeatInfo += $"第{i}条必填数据不能为空<br>";repeatNullCount++;continue;}if (string.IsNullOrEmpty(item["姓名"].ToString())){repeatInfo += $"第{i}条必填数据不能为空<br>";repeatNullCount++;continue;}if (string.IsNullOrEmpty(item["电话"].ToString())){repeatInfo += $"第{i}条必填数据不能为空<br>";repeatNullCount++;continue;}if (string.IsNullOrEmpty(item["密码"].ToString())){repeatInfo += $"第{i}条必填数据不能为空<br>";repeatNullCount++;continue;}if (string.IsNullOrEmpty(item["公司名称"].ToString())){repeatInfo += $"第{i}条必填数据不能为空<br>";repeatNullCount++;continue;}if (string.IsNullOrEmpty(item["公司规模"].ToString())){repeatInfo += $"第{i}条必填数据不能为空<br>";repeatNullCount++;continue;}if (string.IsNullOrEmpty(item["部门"].ToString())){repeatInfo += $"第{i}条必填数据不能为空<br>";repeatNullCount++;continue;}if (string.IsNullOrEmpty(item["职位"].ToString())){repeatInfo += $"第{i}条必填数据不能为空<br>";repeatNullCount++;continue;}if (string.IsNullOrEmpty(item["图片"].ToString())){repeatInfo += $"第{i}条必填数据不能为空<br>";repeatNullCount++;continue;}if (string.IsNullOrEmpty(item["邮箱"].ToString())){repeatInfo += $"第{i}条必填数据不能为空<br>";repeatNullCount++;continue;}                                  if (string.IsNullOrEmpty(item["注册时间"].ToString())){repeatInfo += $"第{i}条必填数据不能为空<br>";repeatNullCount++;continue;}if (string.IsNullOrEmpty(item["状态"].ToString())){repeatInfo += $"第{i}条必填数据不能为空<br>";repeatNullCount++;continue;}//获取exceel里面的值保存到新的对象里var user = new User_tb(){ Id = Guid.NewGuid(),Name = item["姓名"].ToString(),Email = item["邮箱"].ToString(),Telephone = item["电话"].ToString(),CompanyName = item["公司名称"].ToString(),Department = item["部门"].ToString(),Position = item["职位"].ToString(),Password = item["密码"].ToString(),ImgUrl = item["图片"].ToString(),Scale = item["公司规模"].ToString() == "20人以下" ? "10148" : (item["公司规模"].ToString() == "50-100人" ? "10149" : (item["公司规模"].ToString() == "100-500人" ? "10154" : "10155"))};//邮箱重复if (userEmails.Contains(user.Email.ToLower())){repeatInfo += $"第{i}条数据重复 重复邮箱:{user.Email}<br>";repeatCount++;continue;}//手机号重复if (userMobile.Contains(user.Telephone)){repeatInfo += $"第{i}条数据重复 重复手机号:{user.Telephone}<br>";repeatCount++;continue;}if (user.Telephone.Length != 11){repeatInfo += $"第{i}条数据 手机号格式不对:{user.Telephone}<br>";   //验证手机号格式continue;}regUser.Add(user);userEmails.Add(user.Email);userMobile.Add(user.Telephone);}//   .Any() 如果有数据返回true  否则返回false/*IsSignUp = dbContext.Act_SignUp.Any(m => m.UserId == regUserAny.Id && m.ActivityId == ActivityId && m.State > -1);*/dbContext.User_tbs.AddRange(regUser);dbContext.SaveChanges();if (string.IsNullOrEmpty(repeatInfo)){repeatInfo = "无";}string result = $"数据导入完成！<br/>插入条目：{regUser.Count}，重复条目：{repeatCount}， <br/>数据必填项为空条目：{repeatNullCount}。<br/>导入失败数据：<br/>{repeatInfo} <br/>";System.IO.File.Delete(resourcepath);return result;}}return "未发现需要导入的数据，请使用指定模板导入。";}catch (Exception ex){LogHelper.Error($"导入用户数据出错：{ex.Message}---{ex.Source}--{ex.StackTrace}");return "请使用模版导入";}}}            return "未发现文件";}

5、在做完以上操作后我们就可以开始进行修改了，还是老样子逻辑性的东西不做修改，我们只需要把参数做一下修改，改成自己数据库和EXCEL里面的参数字段就可以了，上面的类一定要添加引用哦！！否则有的方法用不了的！！在进行修改的时候要注意上下数据库字段与EXCEL字段顺序一直，否则字段会乱套或者插不进去的！！！

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1、首先大家要有一个上传文件委托配置的类，大家可以新建一个类，名字大家自己取，类里面的代码内容我给大家写到了下方直接复制粘贴即可！不需要做更改直接贴！！，记得添加引用！！

2、需要一个类CovertDataTableHelper，里面有一个方法会用得到，当然大家也可以把这个方法写道其他里面，但是下面调用的时候记得改就行了。

4、接下来我们就可以再我们的控制器中写接口方法了，上面的两个类缺一不可不要嫌长，直接复制就好，基本不用做修改只需添加引用即可！！！

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