ASP.NET Core使用EPPlus操作Excel

1.前言

  本篇文章通過ASP.NET Core的EPPlus包去操作Excel(導入導出),其使用原理與NPOI類似,導出Excel的時候不需要電腦上安裝office,非常好用

2.使用

  新建一個ASP.NET Core Web應用程序(模型視圖控制器),還有一個類庫,SDK2.1版本,解決方案如下

 

3.在EPPlusCommon類庫中創建一個EPPlusHelper類,包括兩個方法,導入和讀取數據

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>
        /// 導入數據到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語句里面我們可以創建多個worksheet，ExcelPackage后面可以傳入路徑參數
            //命名空間是using OfficeOpenXml
            using (ExcelPackage package = new ExcelPackage(file))
            {
                foreach (DataTable dt in ds.Tables)
                {
                    //創建工作表worksheet
                    ExcelWorksheet worksheet = package.Workbook.Worksheets.Add(dt.TableName);
                    //給單元格賦值有兩種方式
                    //worksheet.Cells[1, 1].Value = "單元格的值";直接指定行列數進行賦值
                    //worksheet.Cells["A1"].Value = "單元格的值";直接指定單元格進行賦值
                    worksheet.Cells.Style.Font.Name = "微軟雅黑";
                    worksheet.Cells.Style.Font.Size = 12;
                    worksheet.Cells.Style.ShrinkToFit = true;//單元格自動適應大小
                    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])
                    {
                        //設置樣式: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;  //背景顏色
                        cell.Style.Fill.BackgroundColor.SetColor(Color.FromArgb(128, 128, 128));//設置單元格背景色
                    }
                }
                //保存
                package.Save();
            }
            return true;
        }

        /// <summary>
        /// 讀取Excel數據
        /// </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是從1開始的
                    {
                        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();
        }
    }
}

代碼片段已經給出了一些注釋,對於Excel的更多樣式設置可以參考博客

4.新建一個ExcelController(用於讀取和導入Excel),代碼如下

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 ? "導入Excel成功:" + fileName : "導入失敗";
            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","劉備","男","計算機科學與工程學院","計算機科學與技術"},
                { "151100310002","關羽","男","計算機科學與工程學院","通信工程"},
                { "151100310003","張飛","男","數學與統計學院","信息與計算科學"},
                { "151100310004","小喬","女","文學院","漢語言文學"}
            };
            string[,] scores =
            {
                { "151100310001","劉備","88","90","80"},
                { "151100310002","關羽","86","70","75"},
                { "151100310003","張飛","67","75","81"},
                { "151100310004","小喬","99","89","92"}
            };
            DataTable stuInfoTable = new DataTable
            {
                TableName = "學生信息表"
            };
            stuInfoTable.Columns.Add("學號", typeof(string));
            stuInfoTable.Columns.Add("姓名", typeof(string));
            stuInfoTable.Columns.Add("性別", typeof(string));
            stuInfoTable.Columns.Add("學院", typeof(string));
            stuInfoTable.Columns.Add("專業", typeof(string));
            stuInfoTable.Rows.Add("學號", "姓名", "性別", "學院", "專業");
            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 = "學生成績表"
            };
            stuScoreTable.Columns.Add("學號", typeof(string));
            stuScoreTable.Columns.Add("姓名", typeof(string));
            stuScoreTable.Columns.Add("語文", typeof(string));
            stuScoreTable.Columns.Add("數學", typeof(string));
            stuScoreTable.Columns.Add("英語", typeof(string));
            stuScoreTable.Rows.Add("學號", "姓名", "語文", "數學", "英語");
            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.相關結果如下

 

 

 本文章代碼已經放在github:https://github.com/xs0910/.NET-Core-EPPlus