ExcelHelper

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations.Schema;
using System.Data;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;
using System.Configuration;
using System.Linq.Expressions;
using System.Reflection;
using DocumentFormat.OpenXml;
using DocumentFormat.OpenXml.Packaging;
using DocumentFormat.OpenXml.Spreadsheet;
using CellType = NPOI.SS.UserModel.CellType;
using CellValue = DocumentFormat.OpenXml.Spreadsheet.CellValue;

namespace Comm
{
    public class ExcelHelper
    {
        /// <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 fileName, string sheetName, bool isFirstRowColumn)
        {


            DataTable data = new DataTable();
            int startRow = 0;
            try
            {
                IWorkbook workbook = null;
                //  FileStream fs = null;
                //bool disposed;

                ISheet sheet = null;
                using (FileStream 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)
                    {
                        data.TableName = sheetName;
                        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(j) != null) //同理，没有数据的单元格都默认是null
                                    dataRow[j] = row.GetCell(j).ToString();
                            }
                            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="isFirstRowColumn">第一行是否是DataTable的列名</param>
        /// <returns>返回的DataTable</returns>
        public DataSet ExcelToDataSet(string fileName, bool isFirstRowColumn)
        {

            DataSet ds = new DataSet();
            int startRow = 0;
            try
            {
                //var workbook = null;
                //  FileStream fs = null;
                //bool disposed;

                //ISheet sheet = null;
                using (FileStream 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
                    HSSFWorkbook 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);
                    //}
                    //InputStream input = new FileInputStream("文件路径");
                    for (int t = 0; t < workbook.NumberOfSheets; t++)
                    {
                        ISheet sheet = workbook.GetSheetAt(t);
                        DataTable data = new DataTable();
                        if (sheet != null)
                        {
                            data.TableName = sheet.SheetName;
                            IRow firstRow = sheet.GetRow(1);
                            int cellCount = 5; //一行最后一个cell的编号 即总的列数

                            if (isFirstRowColumn)
                            {
                                for (int i = firstRow.FirstCellNum + 1; 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 + 2;
                            }
                            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 = 1; j < cellCount; ++j)
                                {
                                    if (row.GetCell(j) != null) //同理，没有数据的单元格都默认是null
                                        dataRow[j - 1] = row.GetCell(j).ToString();
                                }
                                data.Rows.Add(dataRow);
                            }
                            ds.Tables.Add(data);
                        }
                    }


                    return ds;
                }
            }
            catch (Exception ex)
            {
                // Console.WriteLine("Exception: " + ex.Message);
                return null;
            }
        }


        /// <summary>
        /// 获取DataTable
        /// </summary>
        /// <param name="fs"></param>
        /// <param name="typestring">通过.xlsx;.xls确认excel</param>
        /// <param name="sheetindex"></param>
        /// <param name="firstRowColumn"></param>
        /// <returns></returns>
        public DataTable ExcelToDataTable(Stream fs, string typestring, int sheetindex, int firstRowColumn)
        {
            DataTable data = new DataTable();
            int startRow = 0;
            try
            {
                IWorkbook workbook = null;
                //  FileStream fs = null;
                //bool disposed;

                ISheet sheet = null;

                if (typestring.IndexOf(".xlsx") > 0) // 2007版本
                    workbook = new XSSFWorkbook(fs);
                else if (typestring.IndexOf(".xls") > 0) // 2003版本
                    workbook = new HSSFWorkbook(fs);


                sheet = workbook.GetSheetAt(0);

                if (sheet != null)
                {
                    IRow firstRow = sheet.GetRow(firstRowColumn);
                    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)
                            {
                                if (!data.Columns.Contains(cellValue))
                                {
                                    DataColumn column = new DataColumn(cellValue);
                                    data.Columns.Add(column);
                                }
                                else
                                {
                                    DataColumn column = new DataColumn(cellValue + i.ToString());
                                    data.Columns.Add(column);
                                }
                            }
                        }
                    }
                    startRow = sheet.FirstRowNum + 1 + firstRowColumn;
                    //}
                    //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)
                        {//同理，没有数据的单元格都默认是null
                            if (row.GetCell(j) != null)
                            {
                                row.GetCell(j).SetCellType(CellType.String);
                                dataRow[j] = row.GetCell(j).StringCellValue;
                            }

                        }
                        data.Rows.Add(dataRow);
                    }
                }
                fs.Dispose();
                return data;

            }
            catch (Exception ex)
            {
                fs.Dispose();
                // Console.WriteLine("Exception: " + ex.Message);
                return null;
            }
        }


        /// <summary>
        /// DataTable转换成Excel文档流(导出数据量超出65535条,分sheet)
        /// </summary>
        /// <param name="table"></param>
        /// <returns></returns>
        public Stream RenderDataTableToExcel(DataTable sourceTable)
        {
            HSSFWorkbook workbook = new HSSFWorkbook();
            MemoryStream ms = new MemoryStream();
            int dtRowsCount = sourceTable.Rows.Count;
            int SheetCount = Convert.ToInt32(Math.Ceiling(Convert.ToDouble(dtRowsCount) / 65536));
            int SheetNum = 1;
            int rowIndex = 1;
            int tempIndex = 1; //标示 
            ISheet sheet = workbook.CreateSheet("sheet1" + SheetNum);
            for (int i = 0; i < dtRowsCount; i++)
            {
                if (i == 0 || tempIndex == 1)
                {
                    IRow headerRow = sheet.CreateRow(0);
                    foreach (DataColumn column in sourceTable.Columns)
                        headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
                }
                HSSFRow dataRow = (HSSFRow)sheet.CreateRow(tempIndex);
                foreach (DataColumn column in sourceTable.Columns)
                {
                    dataRow.CreateCell(column.Ordinal).SetCellValue(sourceTable.Rows[i][column].ToString());
                }

                if (tempIndex == 65535)
                {
                    SheetNum++;
                    sheet = workbook.CreateSheet("sheet" + SheetNum);//
                    tempIndex = 0;
                }
                rowIndex++;
                tempIndex++;
                //AutoSizeColumns(sheet);
            }

            workbook.Write(ms);
            ms.Flush();
            ms.Position = 0;
            sheet = null;
            // headerRow = null;
            workbook = null;
            return ms;
        }

        public Stream RenderDataTableToXlsxExcel(DataTable sourceTable, int sheetsSize = 65536)
        {
            MemoryStream ms = new MemoryStream();
            using (var workbook = SpreadsheetDocument.Create(ms, DocumentFormat.OpenXml.SpreadsheetDocumentType.Workbook))
            {
                var workbookPart = workbook.AddWorkbookPart();
                var sheets = new Sheets();
                workbookPart.Workbook = new Workbook(sheets);
                int total = sourceTable.Rows.Count;
                int SheetCount = Convert.ToInt32(Math.Ceiling(Convert.ToDouble(total) / sheetsSize));
                for (var i = 1u; i <= SheetCount; i++)
                {
                    var worksheetPart = workbookPart.AddNewPart<WorksheetPart>();
                    var sheetData = new SheetData();
                    worksheetPart.Worksheet = new Worksheet(sheetData);

                    var sheet = new Sheet
                    {
                        Id = workbookPart.GetIdOfPart(worksheetPart),
                        Name = $"sheet{i}",
                        SheetId = i
                    };
                    sheets.Append(sheet);

                    DocumentFormat.OpenXml.Spreadsheet.Row headerRow = new DocumentFormat.OpenXml.Spreadsheet.Row();
                    List<String> columns = new List<string>();
                    foreach (DataColumn column in sourceTable.Columns)
                    {
                        columns.Add(column.ColumnName);
                        DocumentFormat.OpenXml.Spreadsheet.Cell cell = new DocumentFormat.OpenXml.Spreadsheet.Cell();
                        cell.DataType = DocumentFormat.OpenXml.Spreadsheet.CellValues.String;
                        cell.CellValue = new DocumentFormat.OpenXml.Spreadsheet.CellValue(column.ColumnName);
                        headerRow.AppendChild(cell);
                    }
                    sheetData.AppendChild(headerRow);
                    DataTable current = sourceTable.AsEnumerable().Skip((int)(i - 1) * sheetsSize)
                                        .Take(sheetsSize).CopyToDataTable();
                    foreach (DataRow dsrow in current.Rows)
                    {
                        DocumentFormat.OpenXml.Spreadsheet.Row newRow = new DocumentFormat.OpenXml.Spreadsheet.Row();
                        foreach (String col in columns)
                        {
                            DocumentFormat.OpenXml.Spreadsheet.Cell cell = new DocumentFormat.OpenXml.Spreadsheet.Cell();
                            cell.DataType = DocumentFormat.OpenXml.Spreadsheet.CellValues.String;
                            cell.CellValue = new DocumentFormat.OpenXml.Spreadsheet.CellValue(dsrow[col].ToString()); //
                            newRow.AppendChild(cell);
                        }
                        sheetData.AppendChild(newRow);
                    }
                }
                workbook.Close();
            }
            ms.Position = 0;
            return ms;
        }



      

        /// <summary>
        /// 能合并行的导出
        /// </summary>
        /// <param name="sourceTable"></param>
        /// <param name="mergeindex">根据哪列判断合并 从0开始算</param>
        /// <param name="hiddenmergeindex">是否隐藏合并列</param> 
        /// <param name="columnWidthArr">列宽度</param>
        /// <param name="mergeArr">需要合并的列 从0开始算</param>
        /// <param name=""></param>
        /// <returns></returns>
        public Stream NPOIDataTableToExcel(DataTable sourceTable, int mergeindex, bool hiddenmergeindex = true, int[] columnWidthArr = null, int[] mergeArr = null)
        {
            HSSFWorkbook workbook = new HSSFWorkbook();
            MemoryStream ms = new MemoryStream();
            int dtRowsCount = sourceTable.Rows.Count;
            int SheetCount = Convert.ToInt32(Math.Ceiling(Convert.ToDouble(dtRowsCount) / 65536));
            int SheetNum = 1;
            int rowIndex = 1;
            int tempIndex = 1; //标示 
            ISheet sheet = workbook.CreateSheet("sheet1" + SheetNum);
            for (int i = 0; i < dtRowsCount; i++)
            {
                if (i == 0 || tempIndex == 1)
                {
                    IRow headerRow = sheet.CreateRow(0);
                    foreach (DataColumn column in sourceTable.Columns)
                        headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
                }
                HSSFRow dataRow = (HSSFRow)sheet.CreateRow(tempIndex);
                foreach (DataColumn column in sourceTable.Columns)
                {
                    ICellStyle style = workbook.CreateCellStyle();//创建样式
                    style.VerticalAlignment = VerticalAlignment.Center;//垂直居中 
                    ICell cell = dataRow.CreateCell(column.Ordinal);
                    cell.SetCellValue(sourceTable.Rows[i][column].ToString());
                    cell.CellStyle = style;
                }
                if (tempIndex == 65535)
                {
                    SheetNum++;
                    sheet = workbook.CreateSheet("sheet" + SheetNum);//
                    tempIndex = 0;
                }
                rowIndex++;
                tempIndex++;
                //AutoSizeColumns(sheet);
            }
            /*设置列宽*/
            if (columnWidthArr != null && columnWidthArr.Length > 0)
            {
                for (int c = 0; c < columnWidthArr.Length; c++)
                {

                    sheet.SetColumnWidth(c, columnWidthArr[c] * 256);
                }
            }
            /*合并单元格*/
            if (mergeArr != null && mergeArr.Count() > 0)
            {
                for (int i = 0; i < dtRowsCount; i++)
                {
                    if (i > 0 && sourceTable.Rows[i][mergeindex].ToString() == sourceTable.Rows[i - 1][mergeindex].ToString())
                    {
                        for (int j = 0; j < mergeArr.Count(); j++)
                        {
                            sheet.AddMergedRegion(new NPOI.SS.Util.CellRangeAddress(i, i + 1, mergeArr[j], mergeArr[j]));
                        }
                    }
                }
            }
            /*是否隐藏判断合并的列*/
            if (mergeindex >= 0)
            {
                sheet.SetColumnHidden(mergeindex, hiddenmergeindex);
            }

            workbook.Write(ms);
            ms.Flush();
            ms.Position = 0;
            sheet = null;
            // headerRow = null;
            workbook = null;
            return ms;
        }
        /// <summary>
        /// NPOI导出EXCEL
        /// </summary>
        /// <param name="dt">数据源</param>
        /// <param name="title">导出文件的名称</param>
        /// <param name="array">列宽数组</param> eventImages 扩展
        public Stream NpoiExcel(DataTable dt, int[] array, bool isShowUrl = false)
        {
            NPOI.HSSF.UserModel.HSSFWorkbook book = new NPOI.HSSF.UserModel.HSSFWorkbook();
            NPOI.SS.UserModel.ISheet sheet = book.CreateSheet("Sheet1");

            NPOI.SS.UserModel.IRow headerrow = sheet.CreateRow(0);
            headerrow.Height = 30 * 20;
            ICellStyle style = book.CreateCellStyle();
            style.BorderTop = NPOI.SS.UserModel.BorderStyle.Thin;
            style.BorderRight = NPOI.SS.UserModel.BorderStyle.Thin;
            style.BorderBottom = NPOI.SS.UserModel.BorderStyle.Thin;
            style.BorderLeft = NPOI.SS.UserModel.BorderStyle.Thin;
            style.WrapText = true;
            style.Alignment = HorizontalAlignment.Center;
            style.VerticalAlignment = VerticalAlignment.Center;


            /*标题*/
            for (int i = 0; i < dt.Columns.Count; i++)
            {
                ICell cell = headerrow.CreateCell(i);
                cell.CellStyle = style;
                cell.SetCellValue(dt.Columns[i].ColumnName);
                /*设置列宽*/
                if (array.Length > 0)
                {
                    for (int c = 0; c < array.Length; c++)
                    {
                        sheet.SetColumnWidth(c, array[c] * 256);
                    }
                }
            }

            /*内容*/
            for (int j = 1; j <= dt.Rows.Count; j++)
            {
                NPOI.SS.UserModel.IRow contentrow = sheet.CreateRow(j);
                contentrow.Height = 100 * 15;
                for (int k = 0; k < dt.Columns.Count; k++)
                {
                    ICell cell = contentrow.CreateCell(k);
                    cell.CellStyle = style;
                    if (dt.Columns[k].ColumnName.Contains("图片"))
                    {
                        if (!isShowUrl)//图片下载
                        {
                            if (dt.Rows[j - 1][k] != null)
                            {
                                string[] pathlist = dt.Rows[j - 1][k].ToString().Split(',');
                                if (pathlist.Count() > 0)
                                {
                                    int index = 0;
                                    foreach (var picurl in pathlist)
                                    {
                                        AddCellPicture(sheet, book, picurl, j, k, index);
                                        index++;
                                    }
                                }
                            }
                        }
                        else//给图片链接
                        {
                            if (dt.Rows[j - 1][k] != null)
                            {
                                string[] pathlist = dt.Rows[j - 1][k].ToString().Split(',');
                                if (pathlist.Count() > 0)
                                {
                                    int index = 0;
                                    foreach (var picurl in pathlist)
                                    {
                                        if (index > 0)
                                        {
                                            cell = contentrow.CreateCell(k + index);
                                        }
                                        cell.CellStyle = style;
                                        cell.SetCellValue(picurl);
                                        index++;
                                    }
                                }
                            }

                        }
                    }
                    else
                    {
                        cell.CellStyle = style;
                        cell.SetCellValue(dt.Rows[j - 1][k].ToString());
                    }
                }
            }

            MemoryStream ms = new MemoryStream();
            book.Write(ms);
            return ms;
        }
        /// <summary>
        /// 向sheet插入图片
        /// </summary>
        /// <param name="sheet"></param>
        /// <param name="workbook"></param>
        /// <param name="fileurl"></param>
        /// <param name="row"></param>
        /// <param name="col"></param>
        private void AddCellPicture(ISheet sheet, HSSFWorkbook workbook, string fileurl, int row, int col, int index)
        {
            try
            {
                if (File.Exists(fileurl) == true)
                {
                    byte[] bytes = System.IO.File.ReadAllBytes(fileurl);
                    if (!string.IsNullOrEmpty(fileurl))
                    {
                        int pictureIdx = workbook.AddPicture(bytes, NPOI.SS.UserModel.PictureType.JPEG);
                        HSSFPatriarch patriarch = (HSSFPatriarch)sheet.CreateDrawingPatriarch();

                        HSSFClientAnchor anchor = new HSSFClientAnchor(0, 0, 0, 0, col + index, row, col + 1 + index, row + 1);
                        HSSFPicture pict = (HSSFPicture)patriarch.CreatePicture(anchor, pictureIdx);
                    }
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }


        
    }
}