core6 EPPlus 导入下载

Posted 2023-06-09 蟾宝

EPPlus是一个使用Open Office XML(xlsx)文件格式，能读写Excel 2007/2010 文件的开源组件，在导出Excel的时候不需要电脑上安装office。

对需要导出报表的数据进行如下操作：

1.引入EPPlus包，在程序包管理控制台中执行命令安装依赖包：

PM> Install-Package EPPlus.Core -Version 1.5.4

 

 

2.创建一个EPPlusHelper类,包括两个方法,导入和读取数据

using OfficeOpenXml;
using OfficeOpenXml.Style;
using System;
using System.Collections.Generic;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;


namespace SW163.Infrastructure

    public class EPPlusHelpe
    
        private static int i;

        /// <summary>
        /// 导入数据到Excel中
        /// </summary>
        /// <param name="fileName"></param>
        /// <param name="ds"></param>
        public static bool ImportExcel(string fileName, DataSet ds)
        
            if (ds == null || ds.Tables.Count == 0)
            
                return false;
            
            FileInfo file = new FileInfo(fileName);
            if (file.Exists)
            
                file.Delete();
                file = new FileInfo(fileName);
            
            //在using语句里面我们可以创建多个worksheet，ExcelPackage后面可以传入路径参数
            //命名空间是using OfficeOpenXml
            using (ExcelPackage package = new ExcelPackage(file))
            
                foreach (DataTable dt in ds.Tables)
                
                    //创建工作表worksheet
                    ExcelWorksheet worksheet = package.Workbook.Worksheets.Add(dt.TableName);
                    //给单元格赋值有两种方式
                    //worksheet.Cells[1, 1].Value = "单元格的值";直接指定行列数进行赋值
                    //worksheet.Cells["A1"].Value = "单元格的值";直接指定单元格进行赋值
                    worksheet.Cells.Style.Font.Name = "微软雅黑";
                    worksheet.Cells.Style.Font.Size = 12;
                    worksheet.Cells.Style.ShrinkToFit = true;//单元格自动适应大小
                    for (int i = 0; i < dt.Rows.Count; i++)
                    
                        for (int j = 0; j < dt.Columns.Count; j++)
                        
                            worksheet.Cells[i + 1, j + 1].Value = dt.Rows[i][j].ToString();
                        
                    
                    using (var cell = worksheet.Cells[1, 1, 1, dt.Columns.Count])
                    
                        //设置样式:首行居中加粗背景色
                        cell.Style.Font.Bold = true; //加粗
                        cell.Style.HorizontalAlignment = ExcelHorizontalAlignment.Center; //水平居中
                        cell.Style.VerticalAlignment = ExcelVerticalAlignment.Center;     //垂直居中
                        cell.Style.Font.Size = 14;
                        cell.Style.Fill.PatternType = ExcelFillStyle.Solid;  //背景颜色
                        cell.Style.Fill.BackgroundColor.SetColor(Color.FromArgb(128, 128, 128));//设置单元格背景色
                    
                
                //保存
                package.Save();
            
            return true;
        

        /// <summary>
        /// 读取Excel数据
        /// </summary>
        /// <param name="fileName"></param>
        public static string ReadExcel(string fileName)
        
            StringBuilder sb = new StringBuilder();
            FileInfo file = new FileInfo(fileName);
            try
            
                using (ExcelPackage package = new ExcelPackage(file))
                
                    var count = package.Workbook.Worksheets.Count;
                    for (int k = 1; k <= count; k++)  //worksheet是从1开始的
                    
                        var workSheet = package.Workbook.Worksheets[k];
                        sb.Append(workSheet.Name);
                        sb.Append(Environment.NewLine);
                        int row = workSheet.Dimension.Rows;
                        int col = workSheet.Dimension.Columns;
                        for (int i = 1; i <= row; i++)
                        
                            for (int j = 1; j <= col; j++)
                            
                                sb.Append(workSheet.Cells[i, j].Value.ToString() + "\\t");
                            
                            sb.Append(Environment.NewLine);
                        
                        sb.Append(Environment.NewLine);
                        sb.Append(Environment.NewLine);
                    
                
            
            catch (Exception ex)
            
                return "An error had Happen";
            
            return sb.ToString();
        
    
  

3.在需要使用的地方调用

  public ExportController(ISignRepository signRepository
            ,IUserRepository userRepository
            ,Microsoft.AspNetCore.Hosting.IHostingEnvironment hostingEnvironment )
        
            SignRepository = signRepository;
            UserRepository = userRepository;
            HostingEnvironment = hostingEnvironment;
        

        public ISignRepository SignRepository  get; 
        public IUserRepository UserRepository  get; 
        public Microsoft.AspNetCore.Hosting.IHostingEnvironment HostingEnvironment  get; 

        public IActionResult Index()
        
            return View();
        

        public async Task<IActionResult> QueryMethod()
        
            if (!string.IsNullOrEmpty(Request.Form["startingTime"]) && !string.IsNullOrEmpty(Request.Form["EndTime"]))
            
                var starTime = Request.Form["startingTime"].ToString();
                var EndTime = Request.Form["EndTime"].ToString();
                var EndTimes = EndTime + " " + "23:59:59";
                var model = await SignRepository.GetListEntitiesAsync(it => it.Workstatus == 1 && it.Searchtime >= Convert.ToDateTime(starTime) &&it.Searchtime<= Convert.ToDateTime(EndTimes));
                if (model.Count > 0)
                
                    //创建数据列表
                    DataTable dataTable = new DataTable();
                    dataTable.Columns.Add("会员名称", typeof(string));
                    dataTable.Columns.Add("开始时间", typeof(string));
                    dataTable.Columns.Add("结束时间", typeof(string));
                    dataTable.Columns.Add("打卡次数", typeof(string));

                    DataRow row1 = dataTable.NewRow();
                    row1["会员名称"] = "会员名称";
                    row1["开始时间"] = "开始时间";
                    row1["结束时间"] = "结束时间";
                    row1["打卡次数"] = "打卡次数";
                    dataTable.Rows.Add(row1);

                    var usermodel = await UserRepository.GetListEntitiesAsync(it => true);
                    if (usermodel.Count > 0) 

                        foreach (var item in usermodel)
                        
                            int Count = 0;
                            foreach (var items in model)
                            
                                if (items.Searchuser == item.Id) 
                                    Count += 1;
                                
                            
                            DataRow row = dataTable.NewRow();
                            row["会员名称"] = item.UserName;
                            row["开始时间"] = starTime;
                            row["结束时间"] = EndTime;
                            row["打卡次数"] = Count;
                            dataTable.Rows.Add(row);
                        

                    
                    // 创建 DataSet 对象
                    DataSet dataSet = new DataSet("MyDataSet");
                    dataSet.Tables.Add(dataTable);

                    string folder = HostingEnvironment.WebRootPath;
                    string year = Convert.ToDateTime(starTime).ToString("yyyy");
                    string moon = Convert.ToDateTime(starTime).ToString("MM");
                    string xlsname = year + "年" + moon + "月打卡记录生成日" + DateTime.Now.ToString("yyyyMMddHHmmss") + ".xlsx";
                    string fileName = Path.Combine(folder, "Excel", xlsname);
                    bool result = EPPlusHelpe.ImportExcel(fileName, dataSet);
                    if (result) 
                        return Content("<script >parent.layer.msg(\'生成成功！\');window.location.href =\'/Export/Index\';</script >", "text/html");
                     
                
            

            return Content("<script >parent.layer.msg(\'操作失败!\');history.go(-1);</script >", "text/html");

        

 

4.用列表来展示生成的报表

 //列表
        public IActionResult GetList()
        
            try
            
                System.IO.DirectoryInfo dir = new System.IO.DirectoryInfo(HostingEnvironment.WebRootPath + "/Excel/");
                DataTable dt = new DataTable();
                dt.Columns.Add("Id", typeof(string));
                dt.Columns.Add("Name", typeof(string));
                dt.Columns.Add("Stime", typeof(System.DateTime));
                dt.Columns.Add("NameSize", typeof(string));
                DataRow dr = dt.NewRow();
                if (Directory.Exists(HostingEnvironment.WebRootPath + "/Excel/"))
                

                    foreach (System.IO.FileInfo fi in dir.GetFiles())
                    

                        if (fi.Extension.ToLower() == ".xlsx")
                        
                            dr = dt.NewRow();
                            dr[0] = fi.Name;
                            dr[1] = fi;
                            dr[2] = fi.CreationTime;
                            dr[3] = (fi.Length / 1024).ToString() + "KB";
                            dt.Rows.Add(dr);
                        
                    

                    DataView dv = dt.DefaultView;
                    dv.Sort = "Stime DESC";
                    dt = dv.ToTable();
                
                List<xlsModel> list = new List<xlsModel>();
                if (dt.Rows.Count > 0)
                
                    for (int i = 0; i < dt.Rows.Count; i++)
                    
                        xlsModel model = new xlsModel();
                        model.Id = dt.Rows[i]["Id"].ToString();
                        model.Name = dt.Rows[i]["Name"].ToString();
                        model.NameSize = dt.Rows[i]["NameSize"].ToString();
                        model.Stime = Convert.ToDateTime(dt.Rows[i]["Stime"].ToString());
                        list.Add(model);
                    
                

                return Json(new  code = 0, msg = "成功", count = dt.Rows.Count, data = list );

            
            catch (System.Exception ex)
            

                return Json(new  code = 200, msg = "获取数据失败！", count = 0, data = ex );
            

        


        //删除
        public IActionResult Del(string Ids)
        
            bool ret = false;
            if (!string.IsNullOrEmpty(Ids))
            
                string[] msg = Ids.Split(\',\');
                dynamic[] id = null;
                if (msg.Length > 0)
                
                    id = new dynamic[msg.Length];
                    for (int i = 0; i < msg.Length; i++)
                    
                        id[i] = HostingEnvironment.WebRootPath + "/Excel/" + msg[i];
                        System.IO.FileInfo file = new System.IO.FileInfo(id[i]);
                        if (file.Exists)
                        
                            file.Delete();
                            ret = true;
                        
                    
                
            
            if (ret)
            
                return Json(new  Msg = "操作成功！" );
            

            return Json(new  Msg = "操作失败！" );
        

xlsModel类

public class xlsModel

    public string Id  get; set; 

    public string Name  get; set; 

    public string NameSize  get; set; 
    public DateTime Stime  get; set; 

五.效果展示

 参考：https://www.cnblogs.com/cxt618/p/10451602.html

ExcelPackage导入导出,命名空间一定要是EPPlus

1.引入EPPlus.dll,旧版的是OfficeOpenXml.dll，最好使用EPPlus
2.调用 string path = UploadExecl(batchUpload.BinaryExcel, "xlsx");，获取上传的xlsx路径
3. 下载Execl
    3.1 如果是<a> 标签的连接，可以将方法直接写在 href上就能直接下载
     <a href="/FangAn/DetailAuditOutPut/" target="_blank" style="color:#fff;"><el-button type="primary">导出Execl</el-button></a>
    后台方法调用：
            byte[] result = GetExcelByte(model);
    返回值为 File();
            return File(result, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", model.OrderName + ".xlsx");

    3.2 如果是js异步操作,需要下载的话：
        后台方法调用：
         byte[] result = GetExcelByte(dt, modelReturn.errMessage);
                    string basestr = Convert.ToBase64String(result);
        返回值为base64的字符串
                    return basestr;
        而前台，在需要多加一步操作，可以直接下载：
        //res.data 为异步返回值，就是basestr
        window.location.href = "data:application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;base64," + res.data;

        /// <summary>
        /// datatable导出
        /// </summary>
        /// <param name="dt"></param>
        /// <returns></returns>
        public byte[] GetExcelByte(DataTable dt, string err)
        {
            using (ExcelPackage package = new ExcelPackage())
            {
                ExcelWorksheet workSheet = package.Workbook.Worksheets.Add("候车亭批量导入");
                workSheet.Cells[1, 1].Value = "媒体类型*";
                workSheet.Cells[1, 2].Value = "类型子类*";
                workSheet.Cells[1, 3].Value = "媒体位置*";
                for (int i = 1; i < dt.Rows.Count; i++)
                {
                    DataRow dr = dt.Rows[i];
                    workSheet.Cells[i + 1, 1].Value = dr[0];
                    workSheet.Cells[i + 1, 2].Value = dr[1];
                    workSheet.Cells[i + 1, 3].Value = dr[2];
                }
                return package.GetAsByteArray();
            }
        }

        /// <summary>
        /// execl转成table
        /// </summary>
        /// <param name="path"></param>
        /// <returns></returns>
        public DataTable ExcelToTable(string path)
        {
            DataTable vTable = new DataTable();
            FileInfo existingFile = new FileInfo(path);
            try
            {
                FileInfo file = new FileInfo(path);
                using (ExcelPackage package = new ExcelPackage(file))
                {
                    ExcelWorksheet worksheet = package.Workbook.Worksheets[1];
                    int vSheetCount = package.Workbook.Worksheets.Count;
                    //获取总Sheet页
                    int maxColumnNum = worksheet.Dimension.End.Column;//最大列
                    int minColumnNum = worksheet.Dimension.Start.Column;//最小列
                    int maxRowNum = worksheet.Dimension.End.Row;//最小行
                    int minRowNum = worksheet.Dimension.Start.Row;//最大行

                    DataColumn vC;
                    for (int j = 1; j <= maxColumnNum; j++)
                    {
                        vC = new DataColumn("A_" + j, typeof(string));
                        vTable.Columns.Add(vC);
                    }
                    for (int n = 1; n <= maxRowNum; n++)
                    {
                        DataRow vRow = vTable.NewRow();
                        for (int m = 1; m <= maxColumnNum; m++)
                        {
                            vRow[m - 1] = worksheet.Cells[n, m].Value;
                        }
                        vTable.Rows.Add(vRow);
                    }
                }

            }
            catch (Exception vErr)
            {
                Console.WriteLine(vErr.Message);
            }
            return vTable;
        }
        /// <summary>
        /// 把二进制流转成文件
        /// </summary>
        /// <param name="path">二进制流，类似(data:application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;base64,)开头的字符串</param>
        /// <param name="path">文件扩展名</param>
        /// <returns></returns>
        public string UploadExecl(string path, string extension)
        {
            string sPath = host.ContentRootPath + "\\BatchUpload";//保存的路径
            if (!Directory.Exists(sPath))
            {
                Directory.CreateDirectory(sPath);
            }
            var regex = new Regex(@"data:(?<mime>[\w/\-\.]+);(?<encoding>\w+),(?<data>.*)", RegexOptions.Compiled);
            var match = regex.Match(path);

            var mimeType = match.Groups["mime"].Value;
            var encodingCode = match.Groups["encoding"].Value;
            var data = match.Groups["data"].Value;
            byte[] targetFileByte = Convert.FromBase64String(data);

            string[] mimeExtension = mimeType.Split(‘/‘);
            string fileExtension = extension;
            Random random = new Random();
            //文件保存
            string fileName = string.Format("{0:yyyyMMddHHmmss}{1}", DateTime.Now, random.Next());
            string filePath = string.Format("{0}\\{1}.{2}", sPath, fileName, fileExtension);
            FileStream file = new FileStream(filePath, FileMode.CreateNew, FileAccess.Write);
            file.Write(targetFileByte,0, targetFileByte.Length);
            file.Close();

            return filePath;
        }