C#Excel导出导入

using System;
using System.Collections.Generic;
using NPOI;
using NPOI.HPSF;
using NPOI.HSSF;
using NPOI.HSSF.UserModel;
using NPOI.POIFS;
using NPOI.Util;
using System.Text;
using System.IO;
using System.Data;
using System.Data.OleDb;
using NPOI.SS.UserModel;

namespace Business
{
    public class CExcelOut
    {
        /// <summary>导出EXCEL表</summary>
        /// <param name="table">table表</param>
        /// <returns>二进制流</returns>
        public MemoryStream GetExecOut(DataTable table)
        {
            if (table == null)
            {
                return null;
            }
            List<DataTable> listTable = new List<DataTable>();
            listTable.Add(table);
            return GetExecOut(listTable);
        }
        /// <summary>导入多个EXCEL表</summary>
        /// <param name="listTable">表集合</param>
        /// <returns>二进制流</returns>
        public MemoryStream GetExecOut(List<DataTable> listTable)
        {
            try
            {
                if (listTable == null || listTable.Count == )
                {
                    return null;
                }
                Dictionary<string, DataTable> rowTable = new Dictionary<string, DataTable>();
                for (int i = ; i < listTable.Count; i++)
                {
                    rowTable.Add("sheet" + (i + ), listTable[i]);
                }
                return GetExecOut(rowTable);
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
                return null;
            }
        }
        /// <summary>导入多个EXCEL表 键是表名 值是table表</summary>
        /// <param name="listTable">键值对集合</param>
        /// <returns>二进制流</returns>
        public MemoryStream GetExecOut(Dictionary<string, DataTable> listTable)
        {
            if (listTable == null || listTable.Count == )
            {
                return null;
            }
            HSSFWorkbook workbook = new HSSFWorkbook();
            MemoryStream ms = new MemoryStream();
            try
            {
                foreach (KeyValuePair<string, DataTable> item in listTable)
                {
                    string steerName = item.Key;
                    //文件名
                    NPOI.SS.UserModel.ISheet sheet = workbook.CreateSheet(steerName);
                    //头部
                    NPOI.SS.UserModel.IRow headerRow = sheet.CreateRow();
                    foreach (DataColumn itemColumn in item.Value.Columns)
                    {
                        headerRow.CreateCell(itemColumn.Ordinal).SetCellValue(itemColumn.ColumnName);
                    }
                    int rowIndex = ;
                    foreach (DataRow itemRow in item.Value.Rows)
                    {
                        NPOI.SS.UserModel.IRow dataRow = sheet.CreateRow(rowIndex);
                        foreach (DataColumn itemColumn in item.Value.Columns)
                        {
                            dataRow.CreateCell(itemColumn.Ordinal).
                                SetCellValue(itemRow[itemColumn.ColumnName].ToString());
                        }
                        rowIndex++;
                    }
                }
                workbook.Write(ms);
                ms.Flush();
                ms.Position = ;
                return ms;

            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
                return null;
            }
            finally
            {
                workbook = null;
            }
        }
        /// <summary>把流转换为文件</summary>
        /// <param name="PathUrl">文件路径，如果文件存在则覆盖,不存在创建</param>
        /// <param name="ms">IO流</param>
        public void ExeclOut(string PathUrl, Stream ms)
        {
            try
            {
                if (PathUrl.Length ==  || ms == null)
                {
                    return;
                }
                FileStream file = new FileStream(PathUrl, FileMode.Create);
                if (ms.CanRead)
                {
                    int lentgth = ;
                    byte[] by = new byte[lentgth];
                    lentgth = ms.Read(by, , lentgth);
                    while (lentgth != )
                    {
                        file.Write(by, , lentgth);
                        lentgth = ms.Read(by, , lentgth);
                    }
                    file.Close();
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
        }

        /// <summary>Excel表变成dataTable</summary>
        /// <param name="filePath">Excel表格路径</param>
        /// <param name="sheetName">查询表名</param>
        /// <returns>数据集合</returns>
        public DataTable GetTop1ExcelData(string filePath, string sheetName)
        {
            DataSet ds = new DataSet();
            try
            {

                string connectionString = "provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + filePath + ";Extended properties=Excel 8.0;";
                string sql = "select * from [" + sheetName + "$]";
                using (OleDbConnection con = new OleDbConnection(connectionString))
                {
                    OleDbCommand cmd = new OleDbCommand(sql, con);
                    OleDbDataAdapter adapt = new OleDbDataAdapter(cmd);
                    adapt.Fill(ds);
                    if (ds != null && ds.Tables.Count > )
                    {
                        return ds.Tables[];
                    }
                    return null;
                }
            }
            catch (Exception exp)
            {
                Console.WriteLine(exp.Message);
                return null;
            }
        }

        /// <summary>Excel表变成dataTable</summary>
        /// <param name="filePath">Excel表格路径</param>
        /// <param name="sheetName">查询表名</param>
        /// <returns>数据集合</returns>
        public DataTable GetExcelData(string filePath, string sheetName)
        {
            DataSet ds = new DataSet();
            try
            {
                string connectionString = "provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + filePath + ";Extended properties='Excel 8.0;HDR=NO;IMEX=1'";
                string sql = "select * from [" + sheetName + "$]";
                using (OleDbConnection con = new OleDbConnection(connectionString))
                {
                    OleDbCommand cmd = new OleDbCommand(sql, con);
                    OleDbDataAdapter adapt = new OleDbDataAdapter(cmd);
                    adapt.Fill(ds);
                    if (ds != null && ds.Tables.Count > )
                    {
                        return ds.Tables[];
                    }
                    return null;
                }
            }
            catch (Exception exp)
            {
                Console.WriteLine(exp.Message);
                return null;
            }
        }
        /// <summary>
        /// Excel表变成dataTable
        /// </summary>
        /// <param name="filePath">Excel表格路径</param>
        /// <returns>数据集合</returns>
        public DataTable GetExcelData(string filePath)
        {
            DataTable table = new DataTable();
            try
            {
                FileStream fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read);
                HSSFWorkbook hssfWorkbook = new HSSFWorkbook(fileStream);

                ISheet iSheet = hssfWorkbook.GetSheetAt();
                if (iSheet != null)
                {
                    IRow iRow = iSheet.GetRow();
                    int cellCount = iRow.LastCellNum;

                    for (int i = iRow.FirstCellNum; i < cellCount; i++)
                    {
                        DataColumn column = new DataColumn(iRow.GetCell(i).StringCellValue);
                        table.Columns.Add(column);
                    }

                    int rowCount = iSheet.LastRowNum;
                    for (int i = (iSheet.FirstRowNum + ); i < iSheet.LastRowNum; i++)
                    {
                        IRow row = iSheet.GetRow(i);
                        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);
                    }
                }

                fileStream.Flush();
                fileStream.Dispose();
                fileStream.Close();
                fileStream = null;

                hssfWorkbook.Dispose();
                hssfWorkbook = null;
                iSheet.Dispose();
                iSheet = null;
            }
            catch (Exception exp)
            {

            }
            finally
            {
            }
            return table;
        }
        /// <summary>
        /// App设置导出Excel模板
        /// </summary>
        /// <param name="tbData"></param>
        /// <param name="headTb"></param>
        /// <param name="steerName"></param>
        /// <returns></returns>
        public MemoryStream GetExecOut(DataTable tbData, DataTable headTb, string steerName)
        {
            if (tbData == null || tbData.Rows.Count == )
            {
                return null;
            }
            HSSFWorkbook workbook = new HSSFWorkbook();
            MemoryStream ms = new MemoryStream();
            try
            {
                //文件名
                NPOI.SS.UserModel.ISheet sheet = workbook.CreateSheet(steerName);
                ICellStyle style = GetStyle(workbook);
                ICellStyle styleLeft = GetStyle(workbook, HorizontalAlignment.LEFT);
                ICellStyle styleSize = GetStyle(workbook, );

                int rowIndex = ;
                //头部
                NPOI.SS.UserModel.IRow headerRow = sheet.CreateRow(rowIndex);
                ICell cell = headerRow.CreateCell(, CellType.STRING);
                cell.SetCellValue("分层标电子水准测量记录手簿");
                cell.CellStyle = style;
                sheet.AddMergedRegion(new NPOI.SS.Util.CellRangeAddress(rowIndex, rowIndex, , ));
                //设置单元格的高度实际是设置其所在行高，所以要在单元格所在行上设置行高，行高设置数值好像是像素点的1/20，所以*20以便达到设置效果；
                //设置单元格的宽度实际上是设置其所在列宽，所以要在单元格所在列上设置（列的设置在工作表上），宽度数值好像是字符的1/256，所以*256以便达到设置效果。
                for (int i = ; i < ; i++)
                {
                    sheet.SetColumnWidth(i,  * );
                }
                headerRow.Height =  * ;
                rowIndex++;
                foreach (DataRow itemRow in headTb.Rows)
                {
                    headerRow = sheet.CreateRow(rowIndex);
                    cell = headerRow.CreateCell(, CellType.STRING);
                    cell.SetCellValue(itemRow["Columns1"].ToString());
                    cell.CellStyle = style;

                    cell = headerRow.CreateCell(, CellType.STRING);
                    cell.SetCellValue(itemRow["Columns2"].ToString());
                    cell.CellStyle = styleLeft;

                    cell = headerRow.CreateCell(, CellType.STRING);
                    cell.CellStyle = style;

                    cell = headerRow.CreateCell(, CellType.STRING);
                    cell.CellStyle = style;

                    cell = headerRow.CreateCell(, CellType.STRING);
                    cell.SetCellValue(itemRow["Columns3"].ToString());
                    cell.CellStyle = style;

                    cell = headerRow.CreateCell(, CellType.STRING);
                    cell.SetCellValue(itemRow["Columns4"].ToString());
                    cell.CellStyle = styleLeft;

                    cell = headerRow.CreateCell(, CellType.STRING);
                    cell.CellStyle = style;

                    cell = headerRow.CreateCell(, CellType.STRING);
                    cell.CellStyle = style;

                    headerRow.Height =  * ;
                    //跨行 跨列 起始行 终止行 起始列 终止列
                    sheet.AddMergedRegion(new NPOI.SS.Util.CellRangeAddress(rowIndex, rowIndex, , ));
                    sheet.AddMergedRegion(new NPOI.SS.Util.CellRangeAddress(rowIndex, rowIndex, , ));
                    rowIndex++;
                }
                NPOI.SS.UserModel.IRow dataRow = sheet.CreateRow(rowIndex);
                dataRow.Height =  * ;
                sheet.SetColumnWidth(rowIndex,  * );
                cell = dataRow.CreateCell(, CellType.STRING);
                cell.SetCellValue("测回编号");
                cell.CellStyle = styleSize;

                cell = dataRow.CreateCell(, CellType.STRING);
                cell.SetCellValue("标点编号");
                cell.CellStyle = styleSize;

                cell = dataRow.CreateCell(, CellType.STRING);
                cell.SetCellValue("中丝读数1");
                cell.CellStyle = styleSize;

                cell = dataRow.CreateCell(, CellType.STRING);
                cell.SetCellValue("中丝读数2");
                cell.CellStyle = styleSize;

                cell = dataRow.CreateCell(, CellType.STRING);
                cell.SetCellValue("中丝读数3");
                cell.CellStyle = styleSize;

                cell = dataRow.CreateCell(, CellType.STRING);
                cell.SetCellValue("距离");
                cell.CellStyle = styleSize;

                cell = dataRow.CreateCell(, CellType.STRING);
                cell.SetCellValue("中丝读数均值");
                cell.CellStyle = styleSize;

                cell = dataRow.CreateCell(, CellType.STRING);
                cell.SetCellValue("高差");
                cell.CellStyle = styleSize;

                rowIndex++;
                foreach (DataRow itemRow in tbData.Rows)
                {
                    dataRow = sheet.CreateRow(rowIndex);
                    dataRow.Height =  * ;
                    foreach (DataColumn itemColumn in tbData.Columns)
                    {
                        dataRow.CreateCell(itemColumn.Ordinal, CellType.STRING).SetCellValue(itemRow[itemColumn.ColumnName].ToString());
                        dataRow.Cells[itemColumn.Ordinal].CellStyle = styleSize;
                    }
                    rowIndex++;
                }
                workbook.Write(ms);
                ms.Flush();
                ms.Position = ;
                return ms;

            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
                return null;
            }
            finally
            {
                workbook = null;
            }
        }
        /// <summary>
        /// App原始中间报表导出模板
        /// </summary>
        /// <param name="tbData"></param>
        /// <returns></returns>
        public MemoryStream GetExcelOut(DataTable tbData)
        {
            if (tbData == null || tbData.Rows.Count == )
            {
                return null;
            }
            HSSFWorkbook workbook = new HSSFWorkbook();
            MemoryStream ms = new MemoryStream();
            try
            {
                //文件名
                NPOI.SS.UserModel.ISheet sheet = workbook.CreateSheet("Sheet1");
                ICellStyle style = GetStyle(workbook);
                ICellStyle styleSize = GetStyle(workbook, );

                int rowIndex = ;
                //头部
                NPOI.SS.UserModel.IRow headerRow = sheet.CreateRow(rowIndex);
                //设置单元格的高度实际是设置其所在行高，所以要在单元格所在行上设置行高，行高设置数值好像是像素点的1/20，所以*20以便达到设置效果；
                //设置单元格的宽度实际上是设置其所在列宽，所以要在单元格所在列上设置（列的设置在工作表上），宽度数值好像是字符的1/256，所以*256以便达到设置效果。
                headerRow.Height =  * ;
                foreach (DataColumn itemColumn in tbData.Columns)
                {
                    ICell cell = headerRow.CreateCell(itemColumn.Ordinal, CellType.STRING);
                    cell.SetCellValue(itemColumn.ColumnName);
                    cell.CellStyle = style;
                    //设置列宽度
                    sheet.SetColumnWidth(itemColumn.Ordinal,  * );
                }

                rowIndex++;
                foreach (DataRow itemRow in tbData.Rows)
                {
                    IRow dataRow = sheet.CreateRow(rowIndex);
                    dataRow.Height =  * ;
                    foreach (DataColumn itemColumn in tbData.Columns)
                    {
                        dataRow.CreateCell(itemColumn.Ordinal, CellType.STRING).SetCellValue(itemRow[itemColumn.ColumnName].ToString());
                        dataRow.Cells[itemColumn.Ordinal].CellStyle = styleSize;
                    }
                    rowIndex++;
                }
                workbook.Write(ms);
                ms.Flush();
                ms.Position = ;
                return ms;

            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
                return null;
            }
            finally
            {
                workbook = null;
            }
        }
        /// <summary>
        /// 获取默认样式
        /// </summary>
        /// <param name="workbook"></param>
        /// <returns></returns>
        public ICellStyle GetStyle(HSSFWorkbook workbook)
        {
            return GetStyle(workbook, , HorizontalAlignment.CENTER_SELECTION);
        }
        /// <summary>
        /// 获取样式
        /// </summary>
        /// <param name="workbook"></param>
        /// <param name="size">设置字体大小</param>
        /// <returns></returns>
        public ICellStyle GetStyle(HSSFWorkbook workbook, short size)
        {
            return GetStyle(workbook, size, HorizontalAlignment.CENTER_SELECTION);
        }
        /// <summary>
        /// 获取样式
        /// </summary>
        /// <param name="workbook"></param>
        /// <param name="ali">设置文本居中</param>
        /// <returns></returns>
        public ICellStyle GetStyle(HSSFWorkbook workbook, HorizontalAlignment ali)
        {
            return GetStyle(workbook, , ali);
        }
        /// <summary>
        /// 获取样式
        /// </summary>
        /// <param name="workbook"></param>
        /// <param name="size">设置字体大小</param>
        /// <param name="ali">设置文本居中</param>
        /// <returns></returns>
        public ICellStyle GetStyle(HSSFWorkbook workbook, short size, HorizontalAlignment ali)
        {
            try
            {
                ICellStyle style = workbook.CreateCellStyle();
                //居中
                style.VerticalAlignment = VerticalAlignment.CENTER;
                //水平居中
                style.Alignment = ali;
                //设置字体
                IFont font = workbook.CreateFont();
                font.FontName = "微软雅黑";
                //设置大小
                font.FontHeightInPoints = size;
                style.SetFont(font);
                return style;
            }
            catch (Exception ex)
            {
                return null;
            }
        }

    }
}

NPOI.DLL下载地址 http://files.cnblogs.com/files/changeMe/NPOI.zip