C# EXCEL的帮助类，仅使用NPOI，不用安装Office

NPOI相关DLL，直接上Nuget获取
这里作为笔记记录一下~
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using NPOI.SS.UserModel;
using NPOI.HSSF.UserModel;
using NPOI.XSSF.UserModel;
using System.Collections;
using System.IO;
using System.Data;
using System.Windows.Forms;namespace Common.basefunc
{public static class ExcelHelper{#region 辅助方法/// <summary>/// 获取要保存的文件名称（含完整路径）/// </summary>/// <returns></returns>public static string GetSaveFilePath(){SaveFileDialog saveFileDig = new SaveFileDialog();saveFileDig.Filter = "Excel Office97-2003(*.xls)|*.xls|Excel Office2007及以上(*.xlsx)|*.xlsx";saveFileDig.FilterIndex = 0;saveFileDig.OverwritePrompt = true;string dir = Environment.GetFolderPath(Environment.SpecialFolder.DesktopDirectory);//获取当前系统桌面路径saveFileDig.InitialDirectory = dir;string filePath = null;if (saveFileDig.ShowDialog() == DialogResult.OK){filePath = saveFileDig.FileName;}return filePath;}/// <summary>/// 打开文件对话框，并返回文件的路径/// </summary>/// <returns></returns>public static string GetOpenFilePath(){//创建对话框的对象OpenFileDialog ofd = new OpenFileDialog();//设置对话框的标题ofd.Title = "请选择要打开的文件";//设置对话框可以多选ofd.Multiselect = true;//设置对话框的初始目录ofd.InitialDirectory = @"C:\Users\Administrator\Desktop";//设置对话框打开文件的类型ofd.Filter = "Excel文件(.xls)|*.xls|Excel文件(.xlsx)|*.xlsx";//展示对话框ofd.ShowDialog();//获得在打开对话框中选中的文件的路径string filePath = ofd.FileName;//全路径return filePath;}/// <summary>/// 判断Excel文件是否为兼容模式（.xls)/// </summary>/// <param name="filePath"></param>/// <returns></returns>public static bool GetIsCompatible(string filePath){return filePath.EndsWith(".xls", StringComparison.OrdinalIgnoreCase);}/// <summary>/// 创建工作薄/// </summary>/// <param name="isCompatible">true就是.xls</param>/// <returns></returns>public static IWorkbook CreateWorkbook(bool isCompatible){if (isCompatible){return new HSSFWorkbook();}else{return new XSSFWorkbook();}}/// <summary>/// 创建工作薄(依据文件流)/// </summary>/// <param name="isCompatible"></param>/// <param name="stream"></param>/// <returns></returns>public static IWorkbook CreateWorkbook(bool isCompatible, Stream stream){if (isCompatible){return new HSSFWorkbook(stream);}else{return new XSSFWorkbook(stream);}}#region 传入一个文件路径，返回一个IWorkbook对象/// <summary>/// 传入一个文件路径，返回一个IWorkbook对象/// </summary>/// <param name="filepath"></param>/// <returns></returns>public static IWorkbook CreateWorkbook(string filepath){IWorkbook workbook = null;bool isCompatible = ExcelHelper.GetIsCompatible(filepath);using (FileStream fs = File.Open(filepath, FileMode.Open,FileAccess.Read, FileShare.ReadWrite)){//把xls文件读入workbook变量里，之后就可以关闭了  workbook = ExcelHelper.CreateWorkbook(isCompatible, fs);fs.Close();}return workbook;}#endregion#region 打开一个excel文件，设置单元格的值，再保存文件/// <summary>/// 打开一个excel文件，设置单元格的值，再保存文件/// </summary>/// <param name="ExcelPath"></param>/// <param name="sheetname"></param>/// <param name="column"></param>/// <param name="row"></param>/// <param name="value"></param>/// <returns></returns>public static bool SetCellValue(String ExcelPath, String sheetname, int column, int row, String value){bool returnb = false;try{IWorkbook wk = null;bool isCompatible = ExcelHelper.GetIsCompatible(ExcelPath);using (FileStream fs = File.Open(ExcelPath, FileMode.Open,FileAccess.Read, FileShare.ReadWrite)){//把xls文件读入workbook变量里，之后就可以关闭了  wk = ExcelHelper.CreateWorkbook(isCompatible, fs);fs.Close();}//把xls文件读入workbook变量里，之后就可以关闭了  //ISheet sheet = wk.GetSheet(sheetname);ISheet sheet = wk.GetSheetAt(0);ICell cell = sheet.GetRow(row).GetCell(column);cell.SetCellValue(value);using (FileStream fileStream = File.Open(ExcelPath,FileMode.OpenOrCreate, FileAccess.ReadWrite)){wk.Write(fileStream);fileStream.Close();}returnb = true;}catch (Exception){returnb = false;throw;}return returnb;}#endregion#region 打开一个文件，读取excel文件某个单元格的值（多少行，多少列）/// <summary>/// 打开一个文件，读取excel文件某个单元格的值（多少行，多少列）/// </summary>/// <param name="ExcelPath"></param>/// <param name="sheetname"></param>/// <param name="column"></param>/// <param name="row"></param>/// <returns></returns>public static String GetCellValue(string ExcelPath, String sheetname, int column, int row){String returnStr = null;try{IWorkbook wk = null;bool isCompatible = ExcelHelper.GetIsCompatible(ExcelPath);using (FileStream fs = File.Open(ExcelPath, FileMode.Open,FileAccess.Read, FileShare.ReadWrite)){//把xls文件读入workbook变量里，之后就可以关闭了  wk = ExcelHelper.CreateWorkbook(isCompatible, fs);fs.Close();}//把xls文件读入workbook变量里，之后就可以关闭了  //ISheet sheet = wk.GetSheet(sheetname);ISheet sheet = wk.GetSheetAt(0);ICell cell = sheet.GetRow(row).GetCell(column);returnStr = cell.ToString();}catch (Exception){returnStr = "Exception";throw;}return returnStr;}#endregion#region  打开一个文件，删除多少以后的数据（是删除，不是清空数据）/// <summary>/// 打开一个文件，删除多少以后的数据（是删除，不是清空数据）/// </summary>/// <param name="fileMatchPath"></param>/// <param name="rowIndex">从多少行后开始删除</param>public static void DelRowsData(string fileMatchPath, int startRowIndex){IWorkbook wk = null;bool isCompatible = ExcelHelper.GetIsCompatible(fileMatchPath);using (FileStream fs = File.Open(fileMatchPath, FileMode.Open,FileAccess.Read, FileShare.ReadWrite)){//把xls文件读入workbook变量里，之后就可以关闭了  wk = ExcelHelper.CreateWorkbook(isCompatible, fs);fs.Close();}ISheet sheet = wk.GetSheetAt(0);for (int i = startRowIndex; i <= sheet.LastRowNum; i++){if (sheet.GetRow(i) == null){i++;continue;}sheet.RemoveRow(sheet.GetRow(i));}//转为字节数组 MemoryStream stream = new MemoryStream();wk.Write(stream);var buf = stream.ToArray();//保存为Excel文件  这种方式能保存.xls和.xlsx文件using (FileStream fs = new FileStream(fileMatchPath, FileMode.Create, FileAccess.Write)){fs.Write(buf, 0, buf.Length);fs.Flush();}}#endregion/// <summary>/// 创建表格头单元格/// </summary>/// <param name="sheet"></param>/// <returns></returns>private static ICellStyle GetCellStyle(IWorkbook workbook){ICellStyle style = workbook.CreateCellStyle();style.FillPattern = FillPattern.SolidForeground;style.FillForegroundColor = NPOI.HSSF.Util.HSSFColor.Grey25Percent.Index;return style;}/// <summary>/// 遍历打印二维数组/// </summary>/// <param name="array"></param>public static void PrintTwoArrayTest(object[,] array){Console.WriteLine("============测试打印二维数组==============");int row = array.GetLength(0);int column = array.GetLength(1);for (int r = 0; r < row; r++){for (int c = 0; c < column; c++){if (array[r, c] != null){string value = array[r, c].ToString();Console.Write($"{value}  |");}}Console.WriteLine();}}/// <summary>/// 传入2个二维数组，进行条件匹配替换，返回替换后的一个二维数组/// </summary>/// <param name="refArray">参考的数组</param>/// <param name="matchArray">带替换的数组</param>/// <param name="refColumn01">参考列1</param>/// <param name="refColumn02">参考列2</param>/// <param name="refColTarget01">被复制的值的列1</param>/// <param name="matchColumn01">带替换的参考列1</param>/// <param name="matchColumn02">带替换的参考列2</param>/// <param name="matchColTarget01">带粘贴的值的列1</param>/// <returns></returns>public static string[,] GetMatchArray(string[,] refArray, string[,] matchArray, int refColumn01, int refColumn02, int refColTarget01, int matchColumn01, int matchColumn02, int matchColTarget01){Console.WriteLine("============遍历2个二维数,匹配替换==============");int row = refArray.GetLength(0);int column = matchArray.GetLength(1);int row02 = matchArray.GetLength(0);int iMatch = 0;for (int r = 0; r < row; r++){string value01 = refArray[r, refColumn01];//第1列的数据string value02 = refArray[r, refColumn02];//第2列的数据if (value01 != null && value02 != null){if (value01.Length > 0 | value02.Length > 0){for (int r02 = 0; r02 < row02; r02++){string match01 = matchArray[r02, matchColumn01];//第1列的数据string match02 = matchArray[r02, matchColumn02];//第2列的数据if (value01 == match01 && value02 == match02){matchArray[r02, matchColTarget01] = refArray[r, refColTarget01];iMatch++;Console.WriteLine($"匹配了{iMatch}次");}}}}}return matchArray;}/// <summary>/// 传入2个数组，根据相同条件匹配，吧ref的目标写入match中/// </summary>/// <param name="refArray">参考的数组</param>/// <param name="matchArray">带替换的数组</param>/// <param name="refColumn01"></param>/// <param name="refColTarget01"></param>/// <param name="matchColumn01"></param>/// <param name="matchColTarget01"></param>/// <returns></returns>public static string[,] GetMatchArray(string[,] refArray, string[,] matchArray, int refColumn01, int refColTarget01, int matchColumn01, int matchColTarget01){Console.WriteLine("============遍历2个二维数,匹配替换==============");int row = refArray.GetLength(0);int column = matchArray.GetLength(1);int row02 = matchArray.GetLength(0);int iMatch = 0;for (int r = 0; r < row; r++){string value01 = string.Empty;value01 = refArray[r, refColumn01];//遍历第一个数组第1列的数据//value01 = value01.Trim();if (value01 != null){if (value01.Length > 0){for (int r02 = 0; r02 < row02; r02++){string match01 = string.Empty;match01 = matchArray[r02, matchColumn01];//遍历第一个数组第1列的数据//match01 = match01.Trim();                                          if (value01 == match01){matchArray[r02, matchColTarget01] = refArray[r, refColTarget01];iMatch++;Console.WriteLine($"匹配了{iMatch}次");}}}}}return matchArray;}/// <summary>/// 遍历一个数组，如果第二列的数值大于等于第一列的数值，替换字符串/// </summary>/// <param name="matchArray"></param>/// <param name="refColumn01"></param>/// <param name="refColumn02"></param>/// <param name="sValue"></param>/// <returns></returns>public static string[,] GetMatchArray(string[,] matchArray, int refColumn01, int refColumn02, string sValue){Console.WriteLine("============遍历2个二维数,匹配替换==============");int row = matchArray.GetLength(0);int column = matchArray.GetLength(1);int iMatch = 0;for (int r = 0; r < row; r++){string value01 = matchArray[r, refColumn01];//第1列的数据string value02 = matchArray[r, refColumn02];//第2列的数据try{int i01 = Convert.ToInt32(value01);int i02 = Convert.ToInt32(value02);if (i01 >= i02){matchArray[r, refColumn02] = sValue + $"（数量：{value02}）";}}catch{}}return matchArray;}#region 打开excel文件，获取某一行的数据/// <summary>/// 打开excel文件，获取某一行的数据/// </summary>/// <param name="filepath">文件全路径</param>/// <param name="iRow">哪一行的数据</param>/// <param name="sheet_Number">哪一个sheet表</param>/// <returns></returns>public static ArrayList GetRowData(string filepath, int sheet_Number, int iRow){ArrayList arrayList = new ArrayList();bool isCompatible = ExcelHelper.GetIsCompatible(filepath);using (FileStream fsRead = File.OpenRead(filepath)){IWorkbook workbook = ExcelHelper.CreateWorkbook(isCompatible, fsRead);ISheet sheet = workbook.GetSheetAt(sheet_Number - 1);IRow currentRow = sheet.GetRow(iRow - 1);for (int c = 0; c < currentRow.LastCellNum; c++){//获取每个单元格(r行c列的数据）ICell cell = currentRow.GetCell(c);//获取单元格的内容string value = string.Empty;if (cell != null){value = cell.ToString(); //如果单元格为空，这里会报错的arrayList.Add(value);}}return arrayList;}}#endregion/// <summary>///  打开excel文件，根据某一行的数据，根据字符串内容，返回这个字符串所在的列的索引/// </summary>/// <param name="filepath"></param>/// <param name="iRow"></param>/// <param name="sheet_Number">从1开始的</param>/// <param name="s1">注意字符串的顺序</param>/// <param name="s2"></param>/// <param name="s3"></param>/// <returns></returnsspublic static ArrayList GetDataIndexs(string filepath, int sheet_Number, int iRow, string s1, string s2, string s3){ArrayList arrayList = new ArrayList();bool isCompatible = ExcelHelper.GetIsCompatible(filepath);using (FileStream fsRead = File.OpenRead(filepath)){IWorkbook workbook = ExcelHelper.CreateWorkbook(isCompatible, fsRead);ISheet sheet = workbook.GetSheetAt(sheet_Number - 1);IRow currentRow = sheet.GetRow(iRow - 1);for (int c = 0; c < currentRow.LastCellNum; c++){//获取每个单元格(r行c列的数据）ICell cell = currentRow.GetCell(c);//获取单元格的内容string value = string.Empty;if (cell != null){value = cell.ToString(); //如果单元格为空，这里会报错的if (value == s1 | value == s2 || value == s3){arrayList.Add(c);}}}Console.WriteLine("==========测试打印索引值============");foreach (var a in arrayList){Console.WriteLine($"{a} |");}return arrayList;}}/// <summary>/// 打开excel文件，根据某一行的字符串，然后这个字符串所在列的索引/// </summary>/// <param name="filepath"></param>/// <param name="sheet_Number"></param>/// <param name="iRow"></param>/// <param name="sValue"></param>/// <returns></returns>public static int GetDataIndex(string filepath, int sheet_Number, int iRow, string sValue){int i = 0;bool isCompatible = ExcelHelper.GetIsCompatible(filepath);using (FileStream fsRead = File.OpenRead(filepath)){IWorkbook workbook = ExcelHelper.CreateWorkbook(isCompatible, fsRead);ISheet sheet = workbook.GetSheetAt(sheet_Number - 1);IRow currentRow = sheet.GetRow(iRow - 1);for (int c = 0; c < currentRow.LastCellNum; c++){//获取每个单元格(r行c列的数据）ICell cell = currentRow.GetCell(c);//获取单元格的内容string value = string.Empty;if (cell != null){value = cell.ToString(); //如果单元格为空，这里会报错的if (value == sValue){i = c;}}}}return i;}/// <summary>/// 打开一个文件，把第几行的数据取出来，返回一个字典 单元格的值：列的索引/// </summary>/// <param name="filepath"></param>/// <param name="sheet_Number">第几张工作表（从1开始）</param>/// <param name="iRow">第几行（从1开始）</param>/// <returns></returns>public static Dictionary<string, int> GetDataDictionary(string filepath, int sheet_Number, int iRow){Dictionary<string, int> DataDict = new Dictionary<string, int>();bool isCompatible = ExcelHelper.GetIsCompatible(filepath);using (FileStream fsRead = File.OpenRead(filepath)){IWorkbook workbook = ExcelHelper.CreateWorkbook(isCompatible, fsRead);ISheet sheet = workbook.GetSheetAt(sheet_Number - 1);IRow currentRow = sheet.GetRow(iRow - 1);for (int c = 0; c < currentRow.LastCellNum; c++){//获取每个单元格(r行c列的数据）ICell cell = currentRow.GetCell(c);//获取单元格的内容string value = string.Empty;if (cell != null){value = cell.ToString(); //如果单元格为空，这里会报错的if (!DataDict.ContainsKey(value)){if (value == "*预计交货日期" | value == "预计交货日期"){value = "*预计交货日期";}DataDict.Add(value, c);}else{if (filepath.Contains("销售订单")) //销售订单模板的第二个备注填写收货地址{if (value == "备注") //如果有两个备注{//DataDict.Add("采购员", c);DataDict.Add("收货地址", c);}}}}}//Console.WriteLine("================开始遍历字典===============");//foreach (KeyValuePair<string, int> kv in DataDict)//通过KeyValuePair遍历元素//{//    Console.WriteLine($"Key:{kv.Key},Value:{kv.Value}");//}return DataDict;}}/// <summary>///  打开一个文件，根据第几张表第几行的中的两个字符，返回值：一个字典/// </summary>/// <param name="filepath"></param>/// <param name="sheet_Number"></param>/// <param name="strColumnKey"></param>/// <param name="strColumnValue"></param>/// <returns></returns>public static Dictionary<string, string> GetDataDictionary(string filepath, int sheet_Number, int iRow, string strColumnKey, string strColumnValue){Dictionary<string, int> dic = GetDataDictionary(filepath, 1, iRow);int iColumnKey = dic[strColumnKey];int iColumnValue = dic[strColumnValue];Dictionary<string, string> DataDict = new Dictionary<string, string>();bool isCompatible = ExcelHelper.GetIsCompatible(filepath);using (FileStream fsRead = File.OpenRead(filepath)){IWorkbook workbook = ExcelHelper.CreateWorkbook(isCompatible, fsRead);ISheet sheet = workbook.GetSheetAt(sheet_Number - 1);for (int i = 0; i <= sheet.LastRowNum; i++){IRow rowdata = sheet.GetRow(i);ICell cellKey = rowdata.GetCell(iColumnKey);ICell cellValue = rowdata.GetCell(iColumnValue);if (cellKey != null && cellValue != null){if (!DataDict.ContainsKey(cellKey.ToString())){string strCellKey = cellKey.ToString();string strCellValue = cellValue.ToString();DataDict.Add(strCellKey, strCellValue);}}}return DataDict;}}#region 根据一个文件，获取一个Excel文件的最大行数和列数（不成熟不建议用）/// <summary>/// 根据一个文件，获取一个Excel文件的最大行数和列数（不成熟不建议用）/// </summary>/// <param name="filepath">excel表格保存的地址，包括"文件名.xls</param>/// <param name="sheet_number">代表将要读取的sheet表的索引位置</param>/// <returns>行数Array[0],列数Array[2]</returns>public static Array GetRowCountAndColumnCount(string filepath, int sheet_number){int rowMaxCount = 0;int columnMaxCount = 0;FileStream readStream = null;try{if (!string.IsNullOrEmpty(filepath) && sheet_number > 0){readStream = new FileStream(filepath, FileMode.Open, FileAccess.Read);bool isCompatible = GetIsCompatible(filepath);IWorkbook workbook = CreateWorkbook(isCompatible, readStream);ISheet sheet = workbook.GetSheetAt(sheet_number - 1);if (sheet != null){rowMaxCount = sheet.LastRowNum + 1; //有效行数(NPOI读取的有效行数不包括列头，所以需要加1)for (int c = 0; c <= sheet.LastRowNum; c++){IRow row = sheet.GetRow(c);
#pragma warning disable CS1525 // 表达式项“=”无效if (row != null && row.LastCellNum > -1)
#pragma warning restore CS1525 // 表达式项“=”无效{columnMaxCount = row.LastCellNum;}}}}}catch (Exception e){Console.WriteLine(e);throw;}finally{if (readStream != null){readStream.Close();}}int[] array = new int[2];array[1] = rowMaxCount;array[2] = columnMaxCount;return array;}#endregion/// <summary>/// Excel转化为二维数组/// </summary>/// <param name="filepath">文件全路径</param>/// <param name="arrayRowNnmber">数组的行数</param>/// <param name="arrayColumnNumber">数组的列数</param>/// <param name="sheet_Number">要遍历的sheet索引</param>/// <returns>返回一个二维素组</returns>public static string[,] ToTwoArray(string filepath, int arrayRowNnmber, int arrayColumnNumber, int sheet_Number){string[,] array = new string[arrayRowNnmber, arrayColumnNumber];bool isCompatible = ExcelHelper.GetIsCompatible(filepath);using (FileStream fsRead = File.OpenRead(filepath)){IWorkbook workbook = ExcelHelper.CreateWorkbook(isCompatible, fsRead);ISheet sheet = workbook.GetSheetAt(sheet_Number - 1); //获取第一个工作表（sheet）int rowCount = sheet.LastRowNum;if (!isCompatible)//如果是xlsx格式的，行数要-2{rowCount = rowCount - 2;}for (int r = 0; r <= rowCount; r++){IRow currentRow = sheet.GetRow(r); //读取当前行数据Console.Write($"第{r}行有{currentRow.LastCellNum}列有数据:--->");for (int c = 0; c < currentRow.LastCellNum; c++){//获取每个单元格(r行c列的数据）ICell cell = currentRow.GetCell(c);//获取单元格的内容string value = string.Empty;if (cell != null){value = cell.ToString(); //如果单元格为空，这里会报错的}Console.Write($"{value}  |");array[r, c] = value;}Console.WriteLine();}return array;}}/// <summary>/// 从工作表中生成DataTable/// </summary>/// <param name="sheet"></param>/// <param name="headerRowIndex"></param>/// <returns></returns>private static DataTable GetDataTableFromSheet(ISheet sheet, int headerRowIndex){DataTable table = new DataTable();IRow headerRow = sheet.GetRow(headerRowIndex);int cellCount = headerRow.LastCellNum;for (int i = headerRow.FirstCellNum; i < cellCount; i++){if (headerRow.GetCell(i) == null || headerRow.GetCell(i).StringCellValue.Trim() == ""){// 如果遇到第一个空列，则不再继续向后读取cellCount = i + 1;break;}DataColumn column = new DataColumn(headerRow.GetCell(i).StringCellValue);table.Columns.Add(column);}for (int i = (headerRowIndex + 1); i <= sheet.LastRowNum; i++){IRow row = sheet.GetRow(i);if (row != null && !string.IsNullOrEmpty(row.Cells[0].StringCellValue)){DataRow dataRow = table.NewRow();for (int j = row.FirstCellNum; j < cellCount; j++){if (row.GetCell(j) != null){dataRow[j] = row.GetCell(j).ToString();}}table.Rows.Add(dataRow);}}return table;}#endregion#region 公共导出方法/// <summary>/// 由DataSet导出Excel/// </summary>/// <param name="sourceTable">要导出数据的DataTable</param>/// <returns>Excel工作表</returns>public static string ExportToExcel(DataSet sourceDs, string filePath = null){if (string.IsNullOrEmpty(filePath)){filePath = GetSaveFilePath();}if (string.IsNullOrEmpty(filePath)) return null;bool isCompatible = GetIsCompatible(filePath);IWorkbook workbook = CreateWorkbook(isCompatible);ICellStyle cellStyle = GetCellStyle(workbook);for (int i = 0; i < sourceDs.Tables.Count; i++){DataTable table = sourceDs.Tables[i];string sheetName = "result" + i.ToString();ISheet sheet = workbook.CreateSheet(sheetName);IRow headerRow = sheet.CreateRow(0);// handling header.foreach (DataColumn column in table.Columns){ICell cell = headerRow.CreateCell(column.Ordinal);cell.SetCellValue(column.ColumnName);cell.CellStyle = cellStyle;}// handling value.int rowIndex = 1;foreach (DataRow row in table.Rows){IRow dataRow = sheet.CreateRow(rowIndex);foreach (DataColumn column in table.Columns){dataRow.CreateCell(column.Ordinal).SetCellValue((row[column] ?? "").ToString());}rowIndex++;}}FileStream fs = new FileStream(filePath, FileMode.OpenOrCreate, FileAccess.ReadWrite);workbook.Write(fs);fs.Dispose();workbook = null;return filePath;}/// <summary>/// 获取sheet表名/// </summary>/// <param name="filePath"></param>/// <returns></returns>public static string[] GetSheetName(string filePath){int sheetNumber = 0;var file = new FileStream(filePath, FileMode.Open, FileAccess.Read);if (filePath.IndexOf(".xlsx") > 0){//2007版本var xssfworkbook = new XSSFWorkbook(file);sheetNumber = xssfworkbook.NumberOfSheets;string[] sheetNames = new string[sheetNumber];for (int i = 0; i < sheetNumber; i++){sheetNames[i] = xssfworkbook.GetSheetName(i);}return sheetNames;}else if (filePath.IndexOf(".xls") > 0){//2003版本var hssfworkbook = new HSSFWorkbook(file);sheetNumber = hssfworkbook.NumberOfSheets;string[] sheetNames = new string[sheetNumber];for (int i = 0; i < sheetNumber; i++){sheetNames[i] = hssfworkbook.GetSheetName(i);}return sheetNames;}return null;}/// <summary>/// 根据表名获取表/// </summary>/// <param name="filePath"></param>/// <param name="sheetName"></param>/// <returns></returns>public static DataTable ExcelToDataTable(string filePath, string sheetName){string outMsg = "";var dt = new DataTable();string fileType = Path.GetExtension(filePath).ToLower();try{ISheet sheet = null;FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read);if (fileType == ".xlsx"){//2007版XSSFWorkbook workbook = new XSSFWorkbook(fs);sheet = workbook.GetSheet(sheetName);if (sheet != null){dt = GetSheetDataTable(sheet, out outMsg);}}else if (fileType == ".xls"){//2003版HSSFWorkbook workbook = new HSSFWorkbook(fs);sheet = workbook.GetSheet(sheetName);if (sheet != null){dt = GetSheetDataTable(sheet, out outMsg);}}}catch (Exception e){Console.WriteLine(e.Message);}return dt;}private static int sheetCellNumMax = 12;/// <summary>/// 获取sheet表对应的DataTable/// </summary>/// <param name="sheet">Excel工作表</param>/// <param name="strMsg"></param>/// <returns></returns>private static DataTable GetSheetDataTable(ISheet sheet, out string strMsg){strMsg = "";DataTable dt = new DataTable();string sheetName = sheet.SheetName;int startIndex = 0;// sheet.FirstRowNum;int lastIndex = sheet.LastRowNum;//最大列数int cellCount = 0;IRow maxRow = sheet.GetRow(0);for (int i = startIndex; i <= lastIndex; i++){IRow row = sheet.GetRow(i);if (row != null && cellCount < row.LastCellNum){cellCount = row.LastCellNum;maxRow = row;}}//列名设置try{//maxRow.LastCellNum = 12 // Lfor (int i = 0; i < sheetCellNumMax; i++)//maxRow.FirstCellNum{dt.Columns.Add(Convert.ToChar(((int)'A') + i).ToString());//DataColumn column = new DataColumn("Column" + (i + 1).ToString());//dt.Columns.Add(column);}}catch{strMsg = "工作表" + sheetName + "中无数据";return null;}//数据填充for (int i = startIndex; i <= lastIndex; i++){IRow row = sheet.GetRow(i);DataRow drNew = dt.NewRow();if (row != null){for (int j = row.FirstCellNum; j < row.LastCellNum; ++j){if (row.GetCell(j) != null){ICell cell = row.GetCell(j);switch (cell.CellType){case CellType.Blank:drNew[j] = "";break;case CellType.Numeric:short format = cell.CellStyle.DataFormat;//对时间格式（2015.12.5、2015/12/5、2015-12-5等）的处理if (format == 14 || format == 31 || format == 57 || format == 58)drNew[j] = cell.DateCellValue;elsedrNew[j] = cell.NumericCellValue;if (cell.CellStyle.DataFormat == 177 || cell.CellStyle.DataFormat == 178 || cell.CellStyle.DataFormat == 188)drNew[j] = cell.NumericCellValue.ToString("#0.00");break;case CellType.String:drNew[j] = cell.StringCellValue;break;case CellType.Formula:try{drNew[j] = cell.NumericCellValue;if (cell.CellStyle.DataFormat == 177 || cell.CellStyle.DataFormat == 178 || cell.CellStyle.DataFormat == 188)drNew[j] = cell.NumericCellValue.ToString("#0.00");}catch{try{drNew[j] = cell.StringCellValue;}catch { }}break;default:drNew[j] = cell.StringCellValue;break;}}}}dt.Rows.Add(drNew);}return dt;}/// <summary>/// 由DataTable导出Excel/// </summary>/// <param name="sourceTable">要导出数据的DataTable</param>/// <returns>Excel工作表</returns>public static string ExportToExcel(DataTable sourceTable, string sheetName = "result", string filePath = null){if (sourceTable.Rows.Count <= 0) return null;if (string.IsNullOrEmpty(filePath)){filePath = GetSaveFilePath();}if (string.IsNullOrEmpty(filePath)) return null;bool isCompatible = GetIsCompatible(filePath);IWorkbook workbook = CreateWorkbook(isCompatible);ICellStyle cellStyle = GetCellStyle(workbook);ISheet sheet = workbook.CreateSheet(sheetName);IRow headerRow = sheet.CreateRow(0);// handling header.foreach (DataColumn column in sourceTable.Columns){ICell headerCell = headerRow.CreateCell(column.Ordinal);headerCell.SetCellValue(column.ColumnName);headerCell.CellStyle = cellStyle;}// handling value.int rowIndex = 1;foreach (DataRow row in sourceTable.Rows){IRow dataRow = sheet.CreateRow(rowIndex);foreach (DataColumn column in sourceTable.Columns){dataRow.CreateCell(column.Ordinal).SetCellValue((row[column] ?? "").ToString());}rowIndex++;}FileStream fs = new FileStream(filePath, FileMode.OpenOrCreate, FileAccess.ReadWrite);workbook.Write(fs);fs.Dispose();sheet = null;headerRow = null;workbook = null;return filePath;}/// <summary>/// 由List导出Excel/// </summary>/// <typeparam name="T">类型</typeparam>/// <param name="data">在导出的List</param>/// <param name="sheetName">sheet名称</param>/// <returns></returns>public static string ExportToExcel<T>(List<T> data, IList<KeyValuePair<string, string>> headerNameList, string sheetName = "result", string filePath = null) where T : class{if (data.Count <= 0) return null;if (string.IsNullOrEmpty(filePath)){filePath = GetSaveFilePath();}if (string.IsNullOrEmpty(filePath)) return null;bool isCompatible = GetIsCompatible(filePath);IWorkbook workbook = CreateWorkbook(isCompatible);ICellStyle cellStyle = GetCellStyle(workbook);ISheet sheet = workbook.CreateSheet(sheetName);IRow headerRow = sheet.CreateRow(0);for (int i = 0; i < headerNameList.Count; i++){ICell cell = headerRow.CreateCell(i);cell.SetCellValue(headerNameList[i].Value);cell.CellStyle = cellStyle;}Type t = typeof(T);int rowIndex = 1;foreach (T item in data){IRow dataRow = sheet.CreateRow(rowIndex);for (int n = 0; n < headerNameList.Count; n++){object pValue = t.GetProperty(headerNameList[n].Key).GetValue(item, null);dataRow.CreateCell(n).SetCellValue((pValue ?? "").ToString());}rowIndex++;}FileStream fs = new FileStream(filePath, FileMode.OpenOrCreate, FileAccess.ReadWrite);workbook.Write(fs);fs.Dispose();sheet = null;headerRow = null;workbook = null;return filePath;}/// <summary>/// 由DataGridView导出Excel/// </summary>/// <param name="grid"></param>/// <param name="sheetName"></param>/// <param name="filePath"></param>/// <returns></returns>public static string ExportToExcel(DataGridView grid, string sheetName = "result", string filePath = null){if (grid.Rows.Count <= 0) return null;if (string.IsNullOrEmpty(filePath)){filePath = GetSaveFilePath();}if (string.IsNullOrEmpty(filePath)) return null;bool isCompatible = GetIsCompatible(filePath);IWorkbook workbook = CreateWorkbook(isCompatible);ICellStyle cellStyle = GetCellStyle(workbook);ISheet sheet = workbook.CreateSheet(sheetName);IRow headerRow = sheet.CreateRow(0);for (int i = 0; i < grid.Columns.Count; i++){ICell cell = headerRow.CreateCell(i);cell.SetCellValue(grid.Columns[i].HeaderText);cell.CellStyle = cellStyle;}int rowIndex = 1;foreach (DataGridViewRow row in grid.Rows){IRow dataRow = sheet.CreateRow(rowIndex);for (int n = 0; n < grid.Columns.Count; n++){dataRow.CreateCell(n).SetCellValue((row.Cells[n].Value ?? "").ToString());}rowIndex++;}AutoColumnWidth(sheet, headerRow.LastCellNum - 1);FileStream fs = new FileStream(filePath, FileMode.OpenOrCreate, FileAccess.ReadWrite);workbook.Write(fs);fs.Dispose();sheet = null;headerRow = null;workbook = null;MessageBox.Show("文件： " + filePath + ".xls 保存成功", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);return filePath;}#endregion/// <summary>/// 自适应列宽/// </summary>/// <param name="sheet"></param>/// <param name="cols"></param>public static void AutoColumnWidth(ISheet sheet, int cols)//获取当前列的宽度，然后对比本列的长度，取最大值{for (int col = 0; col <= cols; col++){sheet.AutoSizeColumn(col);//自适应宽度，但是其实还是比实际文本要宽int columnWidth = sheet.GetColumnWidth(col) / 256;//获取当前列宽度for (int rowIndex = 1; rowIndex <= sheet.LastRowNum; rowIndex++){IRow row;//当前行未被使用过if (sheet.GetRow(rowIndex) == null){row = sheet.CreateRow(rowIndex);}else{row = sheet.GetRow(rowIndex);}if (row.GetCell(col) != null){ICell cell = row.GetCell(col);int contextLength = Encoding.UTF8.GetBytes(cell.ToString()).Length;//获取当前单元格的内容宽度columnWidth = columnWidth < contextLength ? contextLength : columnWidth;}}sheet.SetColumnWidth(col, columnWidth * 256);//需要注意的是列的宽度为 列宽*256，所以获得的宽度需要处以256得到真实的宽度，同样再设置的时候需要再乘上256才能得到正确的值}}#region 公共导入方法/// <summary>/// 由Excel导入DataTable/// </summary>/// <param name="excelFileStream">Excel文件流</param>/// <param name="sheetName">Excel工作表名称</param>/// <param name="headerRowIndex">Excel表头行索引</param>/// <param name="isCompatible">是否为兼容模式</param>/// <returns>DataTable</returns>public static DataTable ImportFromExcel(Stream excelFileStream, string sheetName, int headerRowIndex, bool isCompatible){IWorkbook workbook = CreateWorkbook(isCompatible, excelFileStream);ISheet sheet = null;int sheetIndex = -1;if (int.TryParse(sheetName, out sheetIndex)){sheet = workbook.GetSheetAt(sheetIndex);}else{sheet = workbook.GetSheet(sheetName);}DataTable table = GetDataTableFromSheet(sheet, headerRowIndex);excelFileStream.Close();workbook = null;sheet = null;return table;}/// <summary>/// 由Excel导入DataTable/// </summary>/// <param name="excelFilePath">Excel文件路径，为物理路径。</param>/// <param name="sheetName">Excel工作表名称</param>/// <param name="headerRowIndex">Excel表头行索引</param>/// <returns>DataTable</returns>public static DataTable ImportFromExcel(string excelFilePath, string sheetName, int headerRowIndex){using (FileStream stream = System.IO.File.OpenRead(excelFilePath)){bool isCompatible = GetIsCompatible(excelFilePath);return ImportFromExcel(stream, sheetName, headerRowIndex, isCompatible);}}/// <summary>/// 由Excel导入DataSet，如果有多个工作表，则导入多个DataTable/// </summary>/// <param name="excelFileStream">Excel文件流</param>/// <param name="headerRowIndex">Excel表头行索引</param>/// <param name="isCompatible">是否为兼容模式</param>/// <returns>DataSet</returns>public static DataSet ImportFromExcel(Stream excelFileStream, int headerRowIndex, bool isCompatible){DataSet ds = new DataSet();IWorkbook workbook = CreateWorkbook(isCompatible, excelFileStream);for (int i = 0; i < workbook.NumberOfSheets; i++){ISheet sheet = workbook.GetSheetAt(i);DataTable table = GetDataTableFromSheet(sheet, headerRowIndex);ds.Tables.Add(table);}excelFileStream.Close();workbook = null;return ds;}/// <summary>/// 由Excel导入DataSet，如果有多个工作表，则导入多个DataTable/// </summary>/// <param name="excelFilePath">Excel文件路径，为物理路径。</param>/// <param name="headerRowIndex">Excel表头行索引</param>/// <returns>DataSet</returns>public static DataSet ImportFromExcel(string excelFilePath, int headerRowIndex){using (FileStream stream = System.IO.File.OpenRead(excelFilePath)){bool isCompatible = GetIsCompatible(excelFilePath);return ImportFromExcel(stream, headerRowIndex, isCompatible);}}#endregion#region 公共转换方法/// <summary>/// 将Excel的列索引转换为列名，列索引从0开始，列名从A开始。如第0列为A，第1列为B.../// </summary>/// <param name="index">列索引</param>/// <returns>列名，如第0列为A，第1列为B...</returns>public static string ConvertColumnIndexToColumnName(int index){index = index + 1;int system = 26;char[] digArray = new char[100];int i = 0;while (index > 0){int mod = index % system;if (mod == 0) mod = system;digArray[i++] = (char)(mod - 1 + 'A');index = (index - 1) / 26;}StringBuilder sb = new StringBuilder(i);for (int j = i - 1; j >= 0; j--){sb.Append(digArray[j]);}return sb.ToString();}/// <summary>/// 转化日期/// </summary>/// <param name="date">日期</param>/// <returns></returns>public static DateTime ConvertDate(object date){string dtStr = (date ?? "").ToString();DateTime dt = new DateTime();if (DateTime.TryParse(dtStr, out dt)){return dt;}try{string spStr = "";if (dtStr.Contains("-")){spStr = "-";}else if (dtStr.Contains("/")){spStr = "/";}string[] time = dtStr.Split(spStr.ToCharArray());int year = Convert.ToInt32(time[2]);int month = Convert.ToInt32(time[0]);int day = Convert.ToInt32(time[1]);string years = Convert.ToString(year);string months = Convert.ToString(month);string days = Convert.ToString(day);if (months.Length == 4){dt = Convert.ToDateTime(date);}else{string rq = "";if (years.Length == 1){years = "0" + years;}if (months.Length == 1){months = "0" + months;}if (days.Length == 1){days = "0" + days;}rq = "20" + years + "-" + months + "-" + days;dt = Convert.ToDateTime(rq);}}catch{throw new Exception("日期格式不正确，转换日期失败！");}return dt;}/// <summary>/// 转化数字/// </summary>/// <param name="d">数字字符串</param>/// <returns></returns>public static decimal ConvertDecimal(object d){string dStr = (d ?? "").ToString();decimal result = 0;if (decimal.TryParse(dStr, out result)){return result;}else{throw new Exception("数字格式不正确，转换数字失败！");}}#endregion}
}
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