ASP.NET Core使用EPPlus操作Excel

1.前言

  本篇文章通过ASP.NET Core的EPPlus包去操作Excel(导入导出),其使用原理与NPOI类似,导出Excel的时候不需要电脑上安装office,非常好用

2.使用

  新建一个ASP.NET Core Web应用程序(模型视图控制器),还有一个类库,SDK2.1版本,解决方案如下

3.在EPPlusCommon类库中创建一个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.IO;
using System.Text;
namespace EPPlusCommon
{
    public class EPPlusHelper
    {
        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() + "	");
                            }
                            sb.Append(Environment.NewLine);
                        }
                        sb.Append(Environment.NewLine);
                        sb.Append(Environment.NewLine);
                    }
                }
            }
            catch (Exception ex)
            {
                return "An error had Happen";
            }
            return sb.ToString();
        }
    }
}

代码片段已经给出了一些注释,对于Excel的更多样式设置可以参考博客

4.新建一个ExcelController(用于读取和导入Excel),代码如下

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using EPPlusCommon;
using Microsoft.AspNetCore.Hosting;
using System.IO;
using EPPlusWeb.Models;

namespace EPPlusWeb.Controllers
{
    public class ExcelController : Controller
    {
        private readonly IHostingEnvironment _hosting;
        public ExcelController(IHostingEnvironment hosting)
        {
            _hosting = hosting;
        }
        public IActionResult Import()
        {
            string folder = _hosting.WebRootPath;
            string fileName = Path.Combine(folder, "Excel", "Test.xlsx");
            bool result = EPPlusHelper.ImportExcel(fileName, ExcelData.GetExcelData());
            string str = result ? "导入Excel成功:" + fileName : "导入失败";
            return Content(str);
        }
        public IActionResult Read()
        {
            string folder = _hosting.WebRootPath;
            string fileName = Path.Combine(folder, "Excel", "Test.xlsx");
            string result = EPPlusHelper.ReadExcel(fileName);
            return Content(result);
        }
    }
}

using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Threading.Tasks;

namespace EPPlusWeb.Models
{
    public class ExcelData
    {
        public static DataSet GetExcelData()
        {
            DataSet ds = new DataSet();
            string[,] infos =
            {
                { "151100310001","刘备","男","计算机科学与工程学院","计算机科学与技术"},
                { "151100310002","关羽","男","计算机科学与工程学院","通信工程"},
                { "151100310003","张飞","男","数学与统计学院","信息与计算科学"},
                { "151100310004","小乔","女","文学院","汉语言文学"}
            };
            string[,] scores =
            {
                { "151100310001","刘备","88","90","80"},
                { "151100310002","关羽","86","70","75"},
                { "151100310003","张飞","67","75","81"},
                { "151100310004","小乔","99","89","92"}
            };
            DataTable stuInfoTable = new DataTable
            {
                TableName = "学生信息表"
            };
            stuInfoTable.Columns.Add("学号", typeof(string));
            stuInfoTable.Columns.Add("姓名", typeof(string));
            stuInfoTable.Columns.Add("性别", typeof(string));
            stuInfoTable.Columns.Add("学院", typeof(string));
            stuInfoTable.Columns.Add("专业", typeof(string));
            stuInfoTable.Rows.Add("学号", "姓名", "性别", "学院", "专业");
            for (int i = 0; i < infos.GetLength(0); i++)
            {
                DataRow row = stuInfoTable.NewRow();
                for (int j = 0; j < infos.GetLength(1); j++)
                {
                    row[j] = infos[i, j];
                }
                stuInfoTable.Rows.Add(row);
            }
            ds.Tables.Add(stuInfoTable);

            DataTable stuScoreTable = new DataTable
            {
                TableName = "学生成绩表"
            };
            stuScoreTable.Columns.Add("学号", typeof(string));
            stuScoreTable.Columns.Add("姓名", typeof(string));
            stuScoreTable.Columns.Add("语文", typeof(string));
            stuScoreTable.Columns.Add("数学", typeof(string));
            stuScoreTable.Columns.Add("英语", typeof(string));
            stuScoreTable.Rows.Add("学号", "姓名", "语文", "数学", "英语");
            for (int i = 0; i < scores.GetLength(0); i++)
            {
                DataRow row = stuScoreTable.NewRow();
                for (int j = 0; j < scores.GetLength(1); j++)
                {
                    row[j] = scores[i, j];
                }
                stuScoreTable.Rows.Add(row);
            }
            ds.Tables.Add(stuScoreTable);
            return ds;
        }
    }
}

5.相关结果如下

 本文章代码已经放在github:https://github.com/xs0910/.NET-Core-EPPlus