using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Web;
using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;
using OfficeOpenXml;
using OfficeOpenXml.Style;

namespace CK.SCP.Utils
{
    public class ExcelHelper
    {
            
          // Methods
         /// <summary>
         /// excle 2003
         /// </summary>
         /// <param name="stream"></param>
         /// <returns></returns>
            public static DataTable GetDataTable(Stream stream)
            {


                IWorkbook workbook;
                try 
                {
                    workbook = new HSSFWorkbook(stream);
                }
                catch (Exception exception)
                {
                try
                {
                    workbook = new XSSFWorkbook(stream);
                }
                catch(Exception e)
                {
                    throw e;
                } 
                }
                ISheet sheetAt = workbook.GetSheetAt(0);
                IEnumerator rowEnumerator = sheetAt.GetRowEnumerator();
                DataTable table = new DataTable();
                IRow row = sheetAt.GetRow(0);
                if (row != null)
                {
                    for (int j = 0; j < row.LastCellNum; j++)
                    {
                        ICell cell = row.GetCell(j);
                        if (cell == null)
                        {
                            table.Columns.Add("cell" + j.ToString());
                        }
                        else
                        {
                            table.Columns.Add(cell.ToString());
                        }
                    }
                }
                int count = table.Columns.Count;
                for (int i = 0; rowEnumerator.MoveNext(); i++)
                {
                    if (i > 0)
                    {
                        IRow current = (HSSFRow)rowEnumerator.Current;
                        DataRow row3 = table.NewRow();
                        for (int k = 0; k < count; k++)
                        {
                            ICell cell2 = current.GetCell(k);
                            if (cell2 == null)
                            {
                                row3[k] = null;
                            }
                            else
                            {
                                row3[k] = cell2.ToString();
                            }
                        }
                        table.Rows.Add(row3);
                    }
                }
                return table;
            }

        /// <summary>
        /// excle 2007
        /// </summary>
        /// <param name="stream"></param>
        /// <returns></returns>
        public static DataTable GetDataTableOfXlsx(Stream stream)
        {
            IWorkbook workbook;
            try
            {
                workbook = new XSSFWorkbook(stream);
            }
            catch (Exception exception)
            {
                try
                {
                    workbook = new XSSFWorkbook(stream);
                }
                catch (Exception e)
                {
                    throw e;
                }
            }
            ISheet sheetAt = workbook.GetSheetAt(0);
            IEnumerator rowEnumerator = sheetAt.GetRowEnumerator();
            DataTable table = new DataTable();
            IRow row = sheetAt.GetRow(0);
            if (row != null)
            {
                for (int j = 0; j < row.LastCellNum; j++)
                {
                    ICell cell = row.GetCell(j);
                    if (cell == null)
                    {
                        table.Columns.Add("cell" + j.ToString());
                    }
                    else
                    {
                        table.Columns.Add(cell.ToString());
                    }
                }
            }
            int count = table.Columns.Count;
            for (int i = 0; rowEnumerator.MoveNext(); i++)
            {
                if (i > 0)
                {
                    IRow current = (XSSFRow)rowEnumerator.Current;
                    DataRow row3 = table.NewRow();
                    for (int k = 0; k < count; k++)
                    {
                        ICell cell2 = current.GetCell(k);
                        if (cell2 == null)
                        {
                            row3[k] = null;
                        }
                        else
                        {
                            row3[k] = cell2.ToString();
                        }
                    }
                    table.Rows.Add(row3);
                }
            }
            return table;
        }
        /// <summary>
        /// 删除空行
        /// </summary>
        /// <param name="dt"></param>
        /// <returns></returns>
        public static DataTable RemoveEmpty(DataTable dt)
        {
            List<DataRow> removelist = new List<DataRow>();
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                bool IsNull = true;
                for (int j = 0; j < dt.Columns.Count; j++)
                {
                    if (!string.IsNullOrEmpty(dt.Rows[i][j].ToString().Trim()))
                    {
                        IsNull = false;
                    }
                }
                if (IsNull)
                {
                    removelist.Add(dt.Rows[i]);
                }
            }
            for (int i = 0; i < removelist.Count; i++)
            {
                dt.Rows.Remove(removelist[i]);
            }
            return dt;
        }
        public static DataTable GetDataTable(string filePath)
            {
                
                HSSFWorkbook workbook;
                try
                {
                    using (FileStream stream = new FileStream(filePath, FileMode.Open, FileAccess.Read))
                    {
                        workbook = new HSSFWorkbook(stream);
                    }
                }
                catch (Exception exception)
                {
                    throw exception;
                }
                ISheet sheetAt = workbook.GetSheetAt(0);
                IEnumerator rowEnumerator = sheetAt.GetRowEnumerator();
                DataTable table = new DataTable();
                IRow row = sheetAt.GetRow(0);
                if (row != null)
                {
                    for (int j = 0; j < row.LastCellNum; j++)
                    {
                        ICell cell = row.GetCell(j);
                        if (cell == null)
                        {
                            table.Columns.Add("cell" + j.ToString());
                        }
                        else
                        {
                            table.Columns.Add(cell.ToString());
                        }
                    }
                }
                int count = table.Columns.Count;
                for (int i = 0; rowEnumerator.MoveNext(); i++)
                {
                    if (i > 0)
                    {
                        IRow current = (HSSFRow)rowEnumerator.Current;
                        DataRow row3 = table.NewRow();
                        for (int k = 0; k < count; k++)
                        {
                            ICell cell2 = current.GetCell(k);
                            if (cell2 == null)
                            {
                                row3[k] = null;
                            }
                            else
                            {
                                row3[k] = cell2.ToString();
                            }
                        }
                        table.Rows.Add(row3);
                    }
                }
                return table;
            }



        public static DataTable GetDataTableExtend(string filePath)
        {

            XSSFWorkbook workbook;
            try
            {
                using (FileStream stream = new FileStream(filePath, FileMode.Open, FileAccess.Read))
                {
                    workbook = new XSSFWorkbook(stream);
                }
            }
            catch (Exception exception)
            {
                throw exception;
            }
            ISheet sheetAt = workbook.GetSheetAt(0);
            IEnumerator rowEnumerator = sheetAt.GetRowEnumerator();
            DataTable table = new DataTable();
            IRow row = sheetAt.GetRow(0);
            if (row != null)
            {
                for (int j = 0; j < row.LastCellNum; j++)
                {
                    ICell cell = row.GetCell(j);
                    if (cell == null)
                    {
                        table.Columns.Add("cell" + j.ToString());
                    }
                    else
                    {
                        table.Columns.Add(cell.ToString());
                    }
                }
            }
            int count = table.Columns.Count;
            for (int i = 0; rowEnumerator.MoveNext(); i++)
            {
                if (i > 0)
                {
                    IRow current = (XSSFRow)rowEnumerator.Current;
                    DataRow row3 = table.NewRow();
                    for (int k = 0; k < count; k++)
                    {
                        ICell cell2 = current.GetCell(k);
                        if (cell2 == null)
                        {
                            row3[k] = null;
                        }
                        else
                        {
                            row3[k] = cell2.ToString();
                        }
                    }
                    table.Rows.Add(row3);
                }
            }
            return table;
        }

        /// <summary>
        /// 导入数据到excel文件
        /// </summary>
        /// <param name="data">待导入的数据</param>
        /// <param name="fileName">文件路径</param>
        /// <param name="sheetName">excel表名</param>
        /// <param name="hiddenColmnIndexs">隐藏列索引</param>
        /// <param name="header">列头字典；原始列头=>重命名列名</param>
        /// <param name="redHeaderClomnIndexs">标记红色加粗的列索引</param>
        /// <param name="comments">列头批注字典；列名=>批注内容</param>
        /// <returns></returns>
        public static string SetDataTableToExcel(DataTable data, string fileName, string sheetName, int[] hiddenColmnIndexs = null, Dictionary<string, string> header = null, int[] redHeaderClomnIndexs = null, Dictionary<string, string> comments = null)
            {
                int num4 = 0;
                int num = 0;
                int column = 0;
                int rownum = 0;
                ISheet sheet = null;
                IWorkbook workbook = new HSSFWorkbook();
                //todo:tans
                var stream = new FileStream(fileName, FileMode.OpenOrCreate, FileAccess.ReadWrite);

            try
            {
                sheet = workbook.CreateSheet(sheetName);
                IRow row = sheet.CreateRow(0);
                column = 0;
                int maxCount = Math.Max(header != null ? header.Count : 0, data.Columns.Count);

                IDrawing patr1 = sheet.CreateDrawingPatriarch();// as HSSFPatriarch;
                                                                //创建列头
                while (column < data.Columns.Count)
                {
                    var col = data.Columns[column];
                    var colName = col.ColumnName;
                    ICell cell = row.GetCell(column);
                    if (header != null && header.ContainsKey(colName))
                    {
                        string temp = header[colName];//列重命名
                        header.Remove(colName);
                        cell = row.CreateCell(column);
                        cell.SetCellValue(temp);
                    }
                    //创建批注
                    colName = cell.StringCellValue;
                    if (comments != null && comments.ContainsKey(colName))
                    {
                        var commentStr = comments[colName];
                        IComment comment1 = patr1.CreateCellComment(new HSSFClientAnchor(0, 0, 0, 0, 1, 3, 3, 7));// as HSSFComment;
                        comment1.String = new HSSFRichTextString(commentStr);
                        cell.CellComment = comment1;
                    }
                    column++;
                }
                //附加列头
                int colCount = data.Columns.Count;
                foreach (var colName in header.Keys)
                {
                    row.CreateCell(colCount).SetCellValue(header[colName]);
                    colCount++;
                }
                //设置列头样式
                redHeaderClomnIndexs = redHeaderClomnIndexs ?? new int[] { };
                for (int i = 0, l = 0, rl = redHeaderClomnIndexs.Length; i < row.Cells.Count; i++, l++)
                {
                    var cell = row.GetCell(i);
                    if (cell == null)
                    {
                        continue;
                    }
                    //设置字体
                    IFont font = workbook.CreateFont();
                    font.Boldweight = (short)FontBoldWeight.Bold;
                    if (l < rl)
                    {
                        int index = redHeaderClomnIndexs[l];
                        cell = row.GetCell(index);
                        font.Color = (short)FontColor.Red;
                    }
                    //设置样式
                    ICellStyle style = workbook.CreateCellStyle();
                    style.Alignment = HorizontalAlignment.Center;
                    style.SetFont(font);

                    cell.CellStyle = style;
                }
                //创建数据列，并填充数据
                rownum = 1;
                for (num = 0; num < data.Rows.Count; num++)
                {
                    IRow row2 = sheet.CreateRow(rownum);
                    for (column = 0; column < data.Columns.Count; column++)
                    {
                        row2.CreateCell(column).SetCellValue(data.Rows[num][column].ToString());
                    }
                    rownum++;
                }
                //设置隐藏列
                if (hiddenColmnIndexs != null && hiddenColmnIndexs.Length <= column)
                {
                    for (int i = 0, l = hiddenColmnIndexs.Length; i < l; i++)
                    {
                        sheet.SetColumnHidden(hiddenColmnIndexs[i], true);
                    }
                }
                //当创建完毕所有cell，设置居中才有效
                for (int i = 0; i < row.Cells.Count; i++)
                {
                    sheet.AutoSizeColumn(i);
                }
                workbook.Write(stream);
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                stream.Close();
            }
                return fileName;
            }
        }
    public class EpPlusHelper
    {
        private DataSet _dsExcel;
        private DataTable _dtExcel;
        private string _excelFileName;
        private List<string> _readSheetNames;
     
        private string _pasword = string.Empty;
        public event Action<string,string> ExportExcelCompleted = null;
    
        public EpPlusHelper()
        {
            
        }

        #region Read

        public DataTable ReadExcelToDt(string fileName, string password = "")
        {

            _excelFileName = fileName;
            _pasword = password;
            var excelFileExt = GetFileExt(fileName);

            switch (excelFileExt)
            {
                case ".XLSX":
                    var poDv = new ProcessOperator { BackgroundWork = ReadExcelToDataTable };
                    poDv.BackgroundWorkerCompleted += ReadExcel_Completed;
                    poDv.Start();
                    break;
                case ".XLS":
                    throw new Exception($"需要使用NPOI解析后缀名为{excelFileExt}的文件！");
                default:
                    throw new Exception($"无法解析后缀名为{excelFileExt}的文件！");
            }

            return _dtExcel;
        }

        private DataTable ReadData(ExcelWorksheet sheet)
        {
            var dt = new DataTable(sheet.Name);
            int colStart = sheet.Dimension.Start.Column;
            int colEnd = sheet.Dimension.End.Column;
            int rowStart = sheet.Dimension.Start.Row;
            int rowEnd = sheet.Dimension.End.Row;

            for (var i = colStart; i < colEnd + 1; i++)//从1开始计数
            {
                var columnName = sheet.Cells[rowStart, i].Value.ToString();
                dt.Columns.Add(columnName);
            }


            for (var row = rowStart + 1; row < rowEnd + 1; row++)//从1开始计数，跳过第一行
            {
                var dr = dt.NewRow();
                for (var col = colStart; col < colEnd + 1; col++)//从1开始计数
                {
                    dr[col - 1] = sheet.Cells[row, col]?.Value?.ToString();
                }
                dt.Rows.Add(dr);
            }
            RemoveEmptyRow(dt);
            return dt;
        }

        private void ReadExcelToDataTable()
        {

            _readSheetNames = new List<string>();
            _dsExcel = new DataSet();
            var fs = new FileStream(_excelFileName, FileMode.Open);
            try
            {
                using (
                    var package = string.IsNullOrEmpty(_pasword)
                    ? new ExcelPackage(fs)
                    : new ExcelPackage(fs, _pasword)
                )
                {
                    var validSheetList = GetValidSheetList(package);
                    if (validSheetList.Count == 0) throw new Exception("未找到有效的Excel表单");
                    var sheet = validSheetList[0];
                    _readSheetNames.Add(sheet.Name);
                    _dtExcel = ReadData(sheet);
                }
            }
            finally
            {
                fs.Close();
                fs.Dispose();
            }
        }


        private void ReadExcel_Completed(object sender, BackgroundWorkerEventArgs e)
        {
            if (e.BackGroundException == null)
            {
                if (_readSheetNames == null || _readSheetNames.Count == 0)
                {
                    throw new Exception("文件读失败，未找到符合的系统要求的工作表！");
                }
            }
            else
            {
                throw new Exception("文件读取失败,请联系管理员！");
            }
        }

        private List<ExcelWorksheet> GetValidSheetList(ExcelPackage package)
        {
            var list = new List<ExcelWorksheet>();
            for (var i = 1; i <= package.Workbook.Worksheets.Count; i++)
            {
                var sheet = package.Workbook.Worksheets[i];
                var tableName = sheet.Name;

                if (!tableName.Equals("_xlnm#_FilterDatabase") &&
                    tableName.IndexOf("_", StringComparison.Ordinal) != tableName.Length - 1 &&
                    tableName.IndexOf("FilterDatabase", StringComparison.Ordinal) == -1)
                {
                    list.Add(sheet);
                }
            }
            return list;
        }

        private void GetFileName(string fileName)
        {
            _excelFileName = fileName;
        }

        private string GetFileExt(string fileName)
        {
            return Path.GetExtension(fileName)?.ToUpper();
        }

        #endregion

        #region Write

        public void WriteDsToExcel(string p_sheetName, DataSet ds, string title ,string password = "")
        {
            string fileName = p_sheetName + "-" + DateTime.Now.ToString("yyyyMMddHHmmssfff") + ".xlsx"; // 文件名称  
            string urlPath = "/exportfiles/" + fileName; // 文件下载的URL地址，供给前台下载
            string filePath = HttpContext.Current.Server.MapPath("\\" + urlPath); // 文件路径
            // 1.检测是否存在文件夹，若不存在就建立个文件夹
            string directoryName = Path.GetDirectoryName(filePath);
            if (!Directory.Exists(directoryName))
            {
                Directory.CreateDirectory(directoryName);
            }
            WriteDataSetToExcel(ds, filePath, password,title);
            if (ExportExcelCompleted != null)
            {
                ExportExcelCompleted(filePath,fileName);            
            }
        }

        public void WriteDataSetToExcel(DataSet ds, string excelFileName, string password ,string  title)
        {
            var newFile = GetNewFile(excelFileName);
            _excelFileName = excelFileName;

            using (var package = string.IsNullOrEmpty(password) ? new ExcelPackage(newFile) : new ExcelPackage(newFile, password))
            {
                foreach (DataTable dt in ds.Tables)
                {
                    if (string.IsNullOrEmpty(dt?.TableName) || dt.Rows.Count == 0) continue;
                    EpPlusHelper.RemoveEmptyRow(dt);
                    var sheetName = "sheet1";
                    if (!string.IsNullOrEmpty(dt.TableName))
                        sheetName = dt.TableName;
                    var worksheet = package.Workbook.Worksheets.Add(sheetName);
                    if (title == null)
                    {
                        //表头  
                        SetTitle(dt, worksheet);
                        //各行数据  
                        SetData(dt, worksheet);
                        //设置单元格格式  
                        SetFormat(worksheet);
                    }
                    else
                    {
                        //表头  
                        SetTitle_h(dt, worksheet);
                        //各行数据  
                        SetData_h(dt, worksheet);
                        //设置单元格格式  
                        SetFormat_h(worksheet,title);
                    }
                }
                if (package.Workbook.Worksheets.Count <= 0) return;
                if (string.IsNullOrEmpty(password))
                    package.Save();
                else
                    package.Save(password);
            }
        }
        private static FileInfo GetNewFile(string excelFileName)
        {
            var newFile = new FileInfo(excelFileName);
            if (newFile.Exists)
            {
                newFile.Delete(); // ensures we create a new workbook  
                newFile = new FileInfo(excelFileName);
            }
            return newFile;
        }

        //public void WriteDtToExcel(DataTable dt, string password = "")
        //{

        //    WriteDtToExcel(dt, fileName, password);
        //}

        //public void WriteDtToExcel(DataTable dt, string excelFileName, string password)
        //{
        //    var excelFileExt = GetFileExt(excelFileName);
        //    switch (excelFileExt)
        //    {
        //        case ".XLSX":

        //            if (dt == null || dt.Rows.Count <= 0) throw new Exception("当前表单没有任何数据");
        //            var poDv = new ProcessOperator { BackgroundWork = () => WriteDataTableToExcel(dt, excelFileName, password) };
        //            poDv.BackgroundWorkerCompleted += WriteExcel_Completed;
        //            poDv.Start();
        //            break;
        //        case ".XLS":
        //            throw new Exception($"需要使用NPOI解析后缀名为{excelFileExt}的文件！");
        //        default:
        //            throw new Exception($"无法解析后缀名为{excelFileExt}的文件！");
        //    }
        //}



        private void WriteDataTableToExcel(DataTable dt, string excelFileName, string password)
        {
            var newFile = GetNewFile(excelFileName);

            _excelFileName = excelFileName;

            using (var package = string.IsNullOrEmpty(password) ? new ExcelPackage(newFile) : new ExcelPackage(newFile, password))
            {
                var sheetName = "sheet1";
                if (!string.IsNullOrEmpty(dt.TableName))
                    sheetName = dt.TableName;
                using (var worksheet = package.Workbook.Worksheets.Add(sheetName))
                {
                    //表头  
                    SetTitle(dt, worksheet);
                    //各行数据  
                    SetData(dt, worksheet);
                    //设置单元格格式  
                    SetFormat(worksheet);
                    if (string.IsNullOrEmpty(password))
                        package.Save();
                    else
                        package.Save(password);
                }
            }
        }

        //private void WriteExcel_Completed(object sender, BackgroundWorkerEventArgs e)
        //{
        //    var newFile = new FileInfo(_excelFileName);
        //    if (newFile.Exists)
        //        Process.Start(_excelFileName);
        //}

        private static void SetFormat(ExcelWorksheet worksheet)
        {
            if (worksheet.Dimension == null) return;
            int colStart = worksheet.Dimension.Start.Column;
            int colEnd = worksheet.Dimension.End.Column;
            int rowStart = worksheet.Dimension.Start.Row;
            int rowEnd = worksheet.Dimension.End.Row;   
                    
            //            using (var range = worksheet.Cells[1, 1, 1, dt.Columns.Count])
            using (var range = worksheet.Cells[rowStart, colStart, rowStart, colEnd])
            {
                range.Style.Fill.PatternType = ExcelFillStyle.LightGrid;
                range.Style.Fill.BackgroundColor.SetColor(Color.LightYellow);
                range.Style.HorizontalAlignment = ExcelHorizontalAlignment.CenterContinuous;
            }
            //            using (var range = worksheet.Cells[1, 1, dt.Rows.Count + 1, dt.Columns.Count])
            using (var range = worksheet.Cells[rowStart, colStart, rowEnd, colEnd])
            {
                range.Style.Border.BorderAround(ExcelBorderStyle.Thin);
                range.Style.Font.Name = "微软雅黑";
                range.Style.Font.Size = 12;
                range.AutoFitColumns();
            }
        }
        /// <summary>
        /// 设置单元格（带标题）
        /// </summary>
        /// <param name="worksheet"></param>
        private static void SetFormat_h(ExcelWorksheet worksheet,string title)
        {
            if (worksheet.Dimension == null) return;
            int colStart = worksheet.Dimension.Start.Column;
            int colEnd = worksheet.Dimension.End.Column;
            int rowStart = worksheet.Dimension.Start.Row;
            int rowEnd = worksheet.Dimension.End.Row;
            using (var range = worksheet.Cells[1, 1, 1, worksheet.Dimension.End.Column])
            {
                range.Merge = true;
                range.Style.HorizontalAlignment = ExcelHorizontalAlignment.CenterContinuous;
                range.Value = title;
                range.Style.Font.Size = 24;
            }
            //            using (var range = worksheet.Cells[1, 1, 1, dt.Columns.Count])
            using (var range = worksheet.Cells[rowStart, colStart, rowStart, colEnd])
            {
                range.Style.Fill.PatternType = ExcelFillStyle.LightGrid;
                range.Style.Fill.BackgroundColor.SetColor(Color.LightYellow);
                range.Style.HorizontalAlignment = ExcelHorizontalAlignment.CenterContinuous;
            }
            //            using (var range = worksheet.Cells[1, 1, dt.Rows.Count + 1, dt.Columns.Count])
            using (var range = worksheet.Cells[rowStart, colStart, rowEnd, colEnd])
            {
                range.Style.Border.BorderAround(ExcelBorderStyle.Thin);
                range.Style.Font.Name = "微软雅黑";
                range.Style.Font.Size = 12;
                range.AutoFitColumns();
            }
        }

        private static void SetData(DataTable dt, ExcelWorksheet worksheet)
        {
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                var row = i + 2;
                for (int j = 0; j < dt.Columns.Count; j++)
                {
                    var col = j + 1;
                    var s = dt.Rows[i][j];
                    //////////////////
                    //格式化日期字段
                    var dc = dt.Columns[j];
                    if (dc.DataType.FullName == "System.DateTime")
                    {
                        DateTime time;
                        DateTime.TryParse(s.ToString(), out time);
                        s = time.ToString("yyyy-MM-dd HH:mm:ss");
                    }
                    //使用EPPLUS貌似不需要做这个转换了？
                    //                        if (dc.DataType.FullName == "System.String")
                    //                        {
                    //                            s = "'" + s;
                    //                        }
                    decimal d;
                    if (decimal.TryParse(s.ToString(), out d))
                    {
                        if (Math.Round(d, 5) == 0)
                        {
                            s = 0;
                        }
                    }
                    worksheet.Cells[row, col].Value = s;
                }
            }
        }

        /// <summary>
        /// 设置各行数据（带标题）  
        /// </summary>
        /// <param name="dt"></param>
        /// <param name="worksheet"></param>
        private static void SetData_h(DataTable dt, ExcelWorksheet worksheet)
        {
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                var row = i + 3;
                for (int j = 0; j < dt.Columns.Count; j++)
                {
                    var col = j + 1;
                    var s = dt.Rows[i][j];
                    //////////////////
                    //格式化日期字段
                    var dc = dt.Columns[j];
                    if (dc.DataType.FullName == "System.DateTime")
                    {
                        DateTime time;
                        DateTime.TryParse(s.ToString(), out time);
                        s = time.ToString("yyyy-MM-dd HH:mm:ss");
                    }
                    //使用EPPLUS貌似不需要做这个转换了？
                    //                        if (dc.DataType.FullName == "System.String")
                    //                        {
                    //                            s = "'" + s;
                    //                        }
                    decimal d;
                    if (decimal.TryParse(s.ToString(), out d))
                    {
                        if (Math.Round(d, 5) == 0)
                        {
                            s = 0;
                        }
                    }
                    worksheet.Cells[row, col].Value = s;
                }
            }
        }
        private static void SetTitle(DataTable dt, ExcelWorksheet worksheet)
        {
            int row = 1;
            for (int i = 0; i < dt.Columns.Count; i++)
            {
                var dc = dt.Columns[i];
                row = 1;
                var col = i + 1;

               

                worksheet.Cells[row, col].Value = dc.ColumnName;
            }
            worksheet.View.FreezePanes(row + 1, 1); //冻结表头  
        }

        /// <summary>
        /// 设置表头（带标题）
        /// </summary>
        /// <param name="dt"></param>
        /// <param name="worksheet"></param>
        private static void SetTitle_h(DataTable dt, ExcelWorksheet worksheet)
        {
            int row = 2;
            for (int i = 0; i < dt.Columns.Count; i++)
            {
                var dc = dt.Columns[i];
                row = 2;
                var col = i + 1;
                worksheet.Cells[row, col].Value = dc.ColumnName;

             
            }
            worksheet.View.FreezePanes(row + 1, 1); //冻结表头  
        }
        #endregion

        public static void RemoveEmptyRow(DataTable dt)
        {
            if (dt == null || dt.Rows.Count == 0)
                return;
            var isEmpty = true;
            for (var idx = dt.Rows.Count - 1; idx >= 0; idx--)
            {
                var dr = dt.Rows[idx];
                for (var i = 0; i < dt.Columns.Count; i++)
                {
                    if (dr[i].ToString().Trim() != string.Empty)
                    {
                        isEmpty = false;
                    }
                }
                if (isEmpty)
                    dt.Rows.Remove(dr);
            }
        }
    }




}