对于将数据以 Excel 表格文件输出,还是比较常用的,也存在诸多情况,比如列固定或不固定、数据类型为 List
本文通过包 OfficeOpenXml.Extension.AspNetCore 实现两个方法导出列数固定和不固定的数据。
注意:OfficeOpenXml.Extension.AspNetCore 是一个基于 OfficeOpenXml 拓展,它依赖于 EPPlus,用于根据模板输出 Excel。
包控制台安装:
NuGet> Install-Package OfficeOpenXml.Extension.AspNetCore -Version 1.0.0
本章节方法适用背景:
数据列数固定,且可罗列。
对于对象 List
如下为一个基于 WebAPI 项目的固定列数,动态行数的下载实例:
// 安装包:OfficeOpenXml.Extension.AspNetCore // 支持 Core 3.1 及以上,Standard 2.0 及以上
using OfficeOpenXml;
using OfficeOpenXml.Style;
using Microsoft.AspNetCore.Mvc; // File 支持
[HttpGet]
public FileContentResult DownloadInfo()
{
try
{
string sql_datalist = "";
var resultlist = dapperFactory.Query<ShujuMXModel>(sql_datalist).ToList();
string sFileName = $"{Guid.NewGuid()}.xlsx";
FileInfo fileinfo = new FileInfo(System.IO.Path.Combine("C:/Files", sFileName));
ExcelPackage.LicenseContext = LicenseContext.NonCommercial;
using (ExcelPackage package = new ExcelPackage(fileinfo))
{
// 添加 worksheet
ExcelWorksheet worksheet = package.Workbook.Worksheets.Add("明细表");
// 添加头
worksheet.Cells[1, 1].Value = "序号";
worksheet.Cells[1, 2].Value = "公司";
worksheet.Cells[1, 3].Value = "日期";
// 添加值
for (int i = 0; i < resultlist.Count; i++)
{
worksheet.Cells["A" + (i + 2)].Value = resultlist[i].xuhao;
worksheet.Cells["B" + (i + 2)].Value = resultlist[i].gongsimc;
worksheet.Cells["C" + (i + 2)].Value = resultlist[i].riqi.Substring(0,10);
}
worksheet.Column(1).Width = 10; // 设置列宽,从第 1 列开始
worksheet.Column(2).Width = 30;
worksheet.Column(3).Width = 15;
worksheet.Row(1).Style.Font.Bold = true; // 给第一行内容设置加粗
worksheet.Cells.Style.WrapText = true; // 自动换行
worksheet.Cells.Style.VerticalAlignment = ExcelVerticalAlignment.Top;
// 给有数据的区域添加边框
using (ExcelRange excelRange = worksheet.Cells[1, 1, resultlist.Count + 1, 3]) // [从第一行开始,从第一列开始,到第几行,到第几列]
{
r.Style.Border.Top.Style = ExcelBorderStyle.Thin; // 实线
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); // 黑色
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);
}
worksheet.Row(1).Style.Font.Bold = true;
worksheet.Row(1).Style.HorizontalAlignment = ExcelHorizontalAlignment.Center; // 第一行内容水平居中
package.Save();
}
using (FileStream fs= fileinfo.OpenRead())
{
BinaryReader br = new BinaryReader(fs);
br.BaseStream.Seek(0, SeekOrigin.Begin); // 将文件指针设置到文件开
byte[] fileBytes = br.ReadBytes((int)br.BaseStream.Length);
return File(fileBytes, System.Net.Mime.MediaTypeNames.Application.Octet, sFileName); // 返回文件对象,前端可直接进行下载动作
}
}
catch (Exception ex)
{
return null;
}
}
本章节方法适用背景:
数据列数不固定,且可循环取出,表头和对应的数据顺序相同。
动态列就是,列总数不固定,程序根据传入的列数确定第一行表头。
下面是一个根据 json 字符串,以 Excel 文件形式保存数据的实例。其中包含 “tableheader”节点,来指定动态表头;“tablebody”代表全部数据列表。
// 安装包:OfficeOpenXml.Extension.AspNetCore // 支持 Core 3.1 及以上,Standard 2.0 及以上
// 由于 Excel 2003 版本 和 2007 之后版本文件结构的差异性,当前扩展无法同时兼容两种模式,仅支持 *.xlsx 文件
using OfficeOpenXml;
using OfficeOpenXml.Style;
public void DownloadByJsonstr(string xiazaisj)
{
// string jsonstr = "{\"tableheader\":[{\"mingcheng\":\"列名一\",\"daima\":\"bumenx1\",\"shifoutz\":true},{\"mingcheng\":\"列名二\",\"daima\":\"bumenx2\",\"shifoutz\":true}],\"tablebody\":[{\"kemumc\":\"科目一\",\"bumenx1\":0.12,\"bumenx2\":6.0,\"heji\":6.12,\"erjimx\":[{\"kemumc\":\"科目一明细科目1\",\"bumenx1\":0.0,\"bumenx2\":9.82,\"heji\":9.82},{\"kemumc\":\"科目一明细科目2\",\"bumenx1\":0.12,\"bumenx2\":6.18,\"heji\":6.3}]}]}";
var baobiaosj_json = Json_Object.StrToJson(xiazaisj);
var tableheader = xiazaisj_json["tableheader"];
// 前两列表头固定
List<string> headersname = new List<string>(){ "科目", "合计" }; // 用于显示
List<string> headerscode = new List<string>(){ "kemumc", "heji" }; // 用于取值
// 从第三列开始,按默认顺序加入后续表头
foreach (var thj in tableheader)
{
headersname.Add(thj["mingcheng"].ToString());
headerscode.Add(thj["daima"].ToString());
}
string sFileName = $"{Guid.NewGuid()}.xlsx";
FileInfo fileinfo = new FileInfo(System.IO.Path.Combine("C:/Log", sFileName));
ExcelPackage.LicenseContext = LicenseContext.NonCommercial;
List<TableRowModel> tableRowModels = new List<TableRowModel>();
using (ExcelPackage package = new ExcelPackage(fileinfo))
{
ExcelWorksheet worksheet = package.Workbook.Worksheets.Add("数据表");
EpplusHelper.AddHeader(worksheet, headersname.ToArray()); // 添加表头
var tablebody = xiazaisj_json["tablebody"];
TableRowModel tableRowModel = new TableRowModel();
Dictionary<string, string> keyValuePairs = new Dictionary<string, string>();
foreach (var tablebody_first in tablebody)
{
tableRowModel = new TableRowModel();
keyValuePairs = new Dictionary<string, string>();
tableRowModel.kemumc = tablebody_first["kemumc"].ToString(); // "kemumc": "成本"
tableRowModel.heji = tablebody_first["heji"].ToString();
for (int ii = 2; ii < headerscode.Count; ii++)
{
keyValuePairs.Add(headerscode[ii], tablebody_first[headerscode[ii]].ToString()); // "bumenx1": 0.0
}
tableRowModel.dict_lie = keyValuePairs;
tableRowModels.Add(tableRowModel);
if (tablebody_first["erjimx"] != null)
{
foreach(var tablebody_second in tablebody_first["erjimx"])
{
tableRowModel = new TableRowModel();
keyValuePairs = new Dictionary<string, string>();
tableRowModel.kemumc = tablebody_second["kemumc"].ToString(); // "kemumc": "成本"
tableRowModel.heji = tablebody_second["heji"].ToString();
for (int ii = 2; ii < headerscode.Count; ii++)
{
keyValuePairs.Add(headerscode[ii], tablebody_second[headerscode[ii]].ToString()); // "bumenx1": 0.0
}
tableRowModel.dict_lie = keyValuePairs;
tableRowModels.Add(tableRowModel);
}
}
}
if (tableRowModels.Count > 0)
{
//添加动态数据
EpplusHelper.AddObjects(worksheet, 2, tableRowModels, headerscode);
}
worksheet.Column(1).Width = 20; // 设置列宽
worksheet.Column(2).Width = 20;
for (int ii = 3; ii <= headerscode.Count; ii++) // 为动态列设置统一列宽
{
worksheet.Column(ii).Width = 16;
}
//worksheet.Cells.Style.WrapText = true; // 自动换行
worksheet.Cells.Style.VerticalAlignment = ExcelVerticalAlignment.Top;
using (ExcelRange r = worksheet.Cells[1, 1, tableRowModels.Count + 1, headersname.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);
}
worksheet.View.FreezePanes(2, 3); // 冻结第一行,以及前两列
worksheet.Row(1).Style.Font.Bold = true; // 第一行加粗
worksheet.Row(1).Style.HorizontalAlignment = ExcelHorizontalAlignment.Center;// 第一行水平居中
package.Save();
}
}
EpplusHelper.cs 类,用作循环添加表头和数据。
using System;
using System.Collections.Generic;
using OfficeOpenXml;
public static class EpplusHelper
{
/// <summary>
/// 通过 名称数组 添加表头
/// </summary>
/// <param name="sheet"></param>
/// <param name="headertexts"></param>
public static void AddHeader(ExcelWorksheet sheet, params string[] headertexts)
{
for (var i = 0; i < headertexts.Length; i++)
{
AddHeader(sheet, i + 1, headertexts[i]);
}
}
/// <summary>
/// 添加动态数据
/// </summary>
/// <param name="worksheet"></param>
/// <param name="startrowindex">从第几行开始</param>
/// <param name="items">行数据列表</param>
/// <param name="headerscode">列名代码列表,用于取数据</param>
public static void AddObjects(ExcelWorksheet worksheet, int startrowindex, IList<TableRowModel> items, List<string> headerscode)
{
for (var i = 0; i < items.Count; i++)
{
worksheet.Cells[i + startrowindex, 1].Value = items[i].kemumc; // 注意此处为兼容前两列固定列
worksheet.Cells[i + startrowindex, 2].Value = items[i].heji;
for (var j = 2; j < headerscode.Count; j++) // headercode:kemumc,heji,bumenx1,bumenx2...
{
worksheet.Cells
[i + startrowindex,
j + 1]
.Value
= items[i].dict_lie[headerscode[j]];
}
}
}
}
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