C# 使用Epplus导出数据到Excel

简介：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

功效：支持对excel文档的汇入汇出，图表（excel自带的图表基本都可以实现）的列印
安装：NuGet
 
导出思路:

准备:

1.创建对象

namespace Models
{
    public class Student
    {
        public int ID { get; set; }
        public string Name { get; set; }
        public string Sex { get; set; }
        public int Age { get; set; }
        public string Email { get; set; }
    }
}

1.创建Excel帮助类

using OfficeOpenXml;
using OfficeOpenXml.Style;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Linq;

namespace Common
{
    /// <summary>
    /// Excel导出帮助类
    /// </summary>
    public class ExcelExportHelper
    {
        public static string ExcelContentType => "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
        /// <summary>
        /// List转DataTable
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="data"></param>
        /// <returns></returns>
        public static DataTable ListToDataTable<T>(List<T> data)
        {
            PropertyDescriptorCollection properties = TypeDescriptor.GetProperties(typeof(T));
            DataTable dataTable = new DataTable();
            for (int i = 0; i < properties.Count; i++)
            {
                PropertyDescriptor property = properties[i];
                dataTable.Columns.Add(property.Name, Nullable.GetUnderlyingType(property.PropertyType) ?? property.PropertyType);
            }
            object[] values = new object[properties.Count];
            foreach (T item in data)
            {
                for (int i = 0; i < values.Length; i++)
                {
                    values[i] = properties[i].GetValue(item);
                }
                dataTable.Rows.Add(values);
            }
            return dataTable;
        }

        /// <summary>
        /// 导出Excel
        /// </summary>
        /// <param name="dataTable">数据源</param>
        /// <param name="heading">工作簿Worksheet</param>
        /// <param name="showSrNo">//是否显示行编号</param>
        /// <param name="columnsToTake">要导出的列</param>
        /// <returns></returns>
        public static byte[] ExportExcel(DataTable dataTable, string heading = "", bool showSrNo = false, params string[] columnsToTake)
        {
            byte[] result;
            using (ExcelPackage package = new ExcelPackage())
            {
                ExcelWorksheet workSheet = package.Workbook.Worksheets.Add($"{heading}Data");
                int startRowFrom = string.IsNullOrEmpty(heading) ? 1 : 3;  //开始的行
                //是否显示行编号
                if (showSrNo)
                {
                    DataColumn dataColumn = dataTable.Columns.Add("#", typeof(int));
                    dataColumn.SetOrdinal(0);
                    int index = 1;
                    foreach (DataRow item in dataTable.Rows)
                    {
                        item[0] = index;
                        index++;
                    }
                }
                //Add Content Into the Excel File
                workSheet.Cells["A" + startRowFrom].LoadFromDataTable(dataTable, true);
                // autofit width of cells with small content 
                int columnIndex = 1;
                foreach (DataColumn item in dataTable.Columns)
                {
                    ExcelRange columnCells = workSheet.Cells[workSheet.Dimension.Start.Row, columnIndex, workSheet.Dimension.End.Row, columnIndex];
                    int maxLength = columnCells.Max(cell => cell.Value.ToString().Count());
                    if (maxLength < 150)
                    {
                        workSheet.Column(columnIndex).AutoFit();
                    }
                    columnIndex++;
                }
                // format header - bold, yellow on black 
                using (ExcelRange r = workSheet.Cells[startRowFrom, 1, startRowFrom, dataTable.Columns.Count])
                {
                    r.Style.Font.Color.SetColor(System.Drawing.Color.White);
                    r.Style.Font.Bold = true;
                    r.Style.Fill.PatternType = ExcelFillStyle.Solid;
                    r.Style.Fill.BackgroundColor.SetColor(System.Drawing.ColorTranslator.FromHtml("#1fb5ad"));
                }
                // format cells - add borders 
                using (ExcelRange r = workSheet.Cells[startRowFrom + 1, 1, startRowFrom + dataTable.Rows.Count, dataTable.Columns.Count])
                {
                    r.Style.Border.Top.Style = ExcelBorderStyle.Thin;
                    r.Style.Border.Bottom.Style = ExcelBorderStyle.Thin;
                    r.Style.Border.Left.Style = ExcelBorderStyle.Thin;
                    r.Style.Border.Right.Style = ExcelBorderStyle.Thin;
                    r.Style.Border.Top.Color.SetColor(System.Drawing.Color.Black);
                    r.Style.Border.Bottom.Color.SetColor(System.Drawing.Color.Black);
                    r.Style.Border.Left.Color.SetColor(System.Drawing.Color.Black);
                    r.Style.Border.Right.Color.SetColor(System.Drawing.Color.Black);
                }
                // removed ignored columns 
                for (int i = dataTable.Columns.Count - 1; i >= 0; i--)
                {
                    if (i == 0 && showSrNo)
                    {
                        continue;
                    }
                    if (!columnsToTake.Contains(dataTable.Columns[i].ColumnName))
                    {
                        workSheet.DeleteColumn(i + 1);
                    }
                }
                if (!string.IsNullOrEmpty(heading))
                {
                    workSheet.Cells["A1"].Value = heading;
                    workSheet.Cells["A1"].Style.Font.Size = 20;
                    workSheet.InsertColumn(1, 1);
                    workSheet.InsertRow(1, 1);
                    workSheet.Column(1).Width = 5;
                }
                result = package.GetAsByteArray();
            }
            return result;
        }
        /// <summary>
        /// 导出Excel
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="data"></param>
        /// <param name="heading"></param>
        /// <param name="isShowSlNo"></param>
        /// <param name="columnsToTake"></param>
        /// <returns></returns>
        public static byte[] ExportExcel<T>(List<T> data, string heading = "", bool isShowSlNo = false, params string[] columnsToTake)
        {
            return ExportExcel(ListToDataTable(data), heading, isShowSlNo, columnsToTake);
        }
    }
}

3.获取数据并显示

//数据类
using Models;
using System.Collections.Generic;


namespace BLL
{
    //数据类
    public class StaticDataOfStudent
    {
        public static List<Student> ListStudent => new List<Student>
        {
            new Student {ID = 1, Name = "曹操", Sex = "男", Email = "caocao@163.com", Age = 24},
            new Student {ID = 2, Name = "李易峰", Sex = "女", Email = "lilingjie@sina.com.cn", Age = 24},
            new Student {ID = 3, Name = "张三丰", Sex = "男", Email = "zhangsanfeng@qq.com", Age = 224},
            new Student {ID = 4, Name = "孙权", Sex = "男", Email = "sunquan@163.com", Age = 1224},
        };
    }
}








//用于显示的数据类


using BLL;
using Models;
using System.Collections.Generic;




namespace EPPlusMvcDemo2.Models
{
    public class StudentViewModel
    {
        public List<Student> ListStudent => StaticDataOfStudent.ListStudent;
    }
}






实现部分：


1.控制器




using BLL;
using Common;
using EPPlusMvcDemo2.Models;
using Models;
using System.Collections.Generic;
using System.Web.Mvc;


namespace EPPlusMvcDemo2.Controllers
{
    public class HomeController : Controller
    {
        // GET: Home
        public ActionResult Index()
        {
            StudentViewModel model = new StudentViewModel();
            return View(model);
        }
        //导出
        public FileContentResult ExportToExcel()
        {
            List<Student> lstStudent = StaticDataOfStudent.ListStudent;
            string[] columns = { "ID", "Name", "Age" };
            byte[] filecontent = ExcelExportHelper.ExportExcel(lstStudent, "", false, columns);
            return File(filecontent, ExcelExportHelper.ExcelContentType, "MyStudent.xlsx");
        }
    }
}




2.视图




@model EPPlusMvcDemo2.Models.StudentViewModel
@{
    ViewBag.Title = "Excel文件导出";
}
<div class="panel">
    <div class="panel-heading">
        <a href="@Url.Action("ExportToExcel")" class="btn btn-primary">Export</a>
    </div>
    <div class="panel-body">
        <table class="table table-striped table-bordered">
            <thead>
            <tr>
                <th>ID</th>
                <th>Name</th>
                <th>Sex</th>
                <th>Age</th>
                <th>Email</th>
            </tr>
            </thead>
            <tbody>
            @foreach (var item in Model.ListStudent)
            {
                <tr>
                    <td>@item.ID</td>
                    <td>@item.Name</td>
                    <td>@item.Sex</td>
                    <td>@item.Age</td>
                    <td>@item.Email</td>
                </tr>
            }
            </tbody>
        </table>
    </div>
</div>




 原文:https://www.cnblogs.com/caofangsheng/p/6149843.html





        

	      

	    

	  

	  

	    
      
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          原文地址：https://www.cnblogs.com/zhang1f/p/11093679.html