建议收藏：.net core 使用EPPlus导入导出Excel详细案例，精心整理源码已更新至开源模板

还记得刚曾经因为导入导出不会做而发愁的自己吗？我见过自己前同事因为一个导出改了好几天，然后我们发现虽然有开源的库但是用起来却不得心应手，主要是因为百度使用方案的时候很多方案并不能解决问题。

尤其是尝试新技术那些旧的操作还会有所改变，为了节约开发时间，我们把解决方案收入到一个个demo中，方便以后即拿即用。而且这些demo有博客文档支持，帮助任何人非常容易上手开发跨平台的.net core。随着时间的推移，我们的demo库会日益强大请及时收藏github。

一、首先在common公用项目中引用epplus.core类库和json序列化的类库及读取配置文件的类库

install-package epplus.core -version 1.5.4
install-package newtonsoft.json -version 12.0.3-beta2
install-package microsoft.extensions.configuration.json -version 3.0.0

二、在common公用项目中添加相关操作类officehelper和commonhelper及confighelper

 1.officehelper中excel的操作方法

#region excel
#region epplus导出excel
/// <summary>
/// datatable导出excel
/// </summary>
/// <param name="dt">数据源</param>
/// <param name="swebrootfolder">webroot文件夹</param>
/// <param name="sfilename">文件名</param>
/// <param name="scolumnname">自定义列名（不传默认dt列名）</param>
/// <param name="msg">失败返回错误信息，有数据返回路径</param>
/// <returns></returns>
public static bool dtexportepplusexcel(datatable dt, string swebrootfolder, string sfilename, string[] scolumnname, ref string msg)
{
try
{
if (dt == null || dt.rows.count == 0)
{
msg = "数据为空";
return false;
}
//转utf-8
utf8encoding utf8 = new utf8encoding();
byte[] buffer = utf8.getbytes(sfilename);
sfilename = utf8.getstring(buffer);
//判断文件夹，不存在创建
if (!directory.exists(swebrootfolder))
directory.createdirectory(swebrootfolder);
//删除大于30天的文件，为了保证文件夹不会有过多文件
string[] files = directory.getfiles(swebrootfolder, "*.xlsx", searchoption.alldirectories);
foreach (string item in files)
{
fileinfo f = new fileinfo(item);
datetime now = datetime.now;
timespan t = now - f.creationtime;
int day = t.days;
if (day > 30)
{
file.delete(item);
}
}
//判断同名文件
fileinfo file = new fileinfo(path.combine(swebrootfolder, sfilename));
if (file.exists)
{
//判断同名文件创建时间
file.delete();
file = new fileinfo(path.combine(swebrootfolder, sfilename));
}
using (excelpackage package = new excelpackage(file))
{
//添加worksheet
excelworksheet worksheet = package.workbook.worksheets.add(sfilename.split('.')[0]);
//添加表头
int column = 1;
if (scolumnname.count() == dt.columns.count)
{
foreach (string cn in scolumnname)
{
worksheet.cells[1, column].value = cn.trim();//可以只保留这个，不加央视，导出速度也会加快
worksheet.cells[1, column].style.font.bold = true;//字体为粗体
worksheet.cells[1, column].style.horizontalalignment = officeopenxml.style.excelhorizontalalignment.center;//水平居中
worksheet.cells[1, column].style.fill.patterntype = officeopenxml.style.excelfillstyle.solid;//设置样式类型
worksheet.cells[1, column].style.fill.backgroundcolor.setcolor(system.drawing.color.fromargb(159, 197, 232));//设置单元格背景色
column++;
}
}
else
{
foreach (datacolumn dc in dt.columns)
{
worksheet.cells[1, column].value = dc.columnname;//可以只保留这个，不加央视，导出速度也会加快
worksheet.cells[1, column].style.font.bold = true;//字体为粗体
worksheet.cells[1, column].style.horizontalalignment = officeopenxml.style.excelhorizontalalignment.center;//水平居中
worksheet.cells[1, column].style.fill.patterntype = officeopenxml.style.excelfillstyle.solid;//设置样式类型
worksheet.cells[1, column].style.fill.backgroundcolor.setcolor(system.drawing.color.fromargb(159, 197, 232));//设置单元格背景色
column++;
}
}
//添加数据
int row = 2;
foreach (datarow dr in dt.rows)
{
int col = 1;
foreach (datacolumn dc in dt.columns)
{
worksheet.cells[row, col].value = dr[col - 1].tostring();//这里已知可以减少一层循环，速度会上升
col++;
}
row++;
}
//自动列宽，由于自动列宽大数据导出严重影响速度，我这里就不开启了，大家可以根据自己情况开启
//worksheet.cells.autofitcolumns();
//保存workbook.
package.save();
}
return true;
}
catch (exception ex)
{
msg = "生成excel失败：" + ex.message;
commonhelper.writeerrorlog("生成excel失败：" + ex.message);
return false;
}
}
/// <summary>
/// model导出excel
/// </summary>
/// <param name="list">数据源</param>
/// <param name="swebrootfolder">webroot文件夹</param>
/// <param name="sfilename">文件名</param>
/// <param name="scolumnname">自定义列名</param>
/// <param name="msg">失败返回错误信息，有数据返回路径</param>
/// <returns></returns>
public static bool modelexportepplusexcel<t>(list<t> mylist, string swebrootfolder, string sfilename, string[] scolumnname, ref string msg)
{
try
{
if (mylist == null || mylist.count == 0)
{
msg = "数据为空";
return false;
}
//转utf-8
utf8encoding utf8 = new utf8encoding();
byte[] buffer = utf8.getbytes(sfilename);
sfilename = utf8.getstring(buffer);
//判断文件夹，不存在创建
if (!directory.exists(swebrootfolder))
directory.createdirectory(swebrootfolder);
//删除大于30天的文件，为了保证文件夹不会有过多文件
string[] files = directory.getfiles(swebrootfolder, "*.xlsx", searchoption.alldirectories);
foreach (string item in files)
{
fileinfo f = new fileinfo(item);
datetime now = datetime.now;
timespan t = now - f.creationtime;
int day = t.days;
if (day > 30)
{
file.delete(item);
}
}
//判断同名文件
fileinfo file = new fileinfo(path.combine(swebrootfolder, sfilename));
if (file.exists)
{
//判断同名文件创建时间
file.delete();
file = new fileinfo(path.combine(swebrootfolder, sfilename));
}
using (excelpackage package = new excelpackage(file))
{
//添加worksheet
excelworksheet worksheet = package.workbook.worksheets.add(sfilename.split('.')[0]);
//添加表头
int column = 1;
if (scolumnname.count() > 0)
{
foreach (string cn in scolumnname)
{
worksheet.cells[1, column].value = cn.trim();//可以只保留这个，不加央视，导出速度也会加快
worksheet.cells[1, column].style.font.bold = true;//字体为粗体
worksheet.cells[1, column].style.horizontalalignment = officeopenxml.style.excelhorizontalalignment.center;//水平居中
worksheet.cells[1, column].style.fill.patterntype = officeopenxml.style.excelfillstyle.solid;//设置样式类型
worksheet.cells[1, column].style.fill.backgroundcolor.setcolor(system.drawing.color.fromargb(159, 197, 232));//设置单元格背景色
column++;
}
}
//添加数据
int row = 2;
foreach (t ob in mylist)
{
int col = 1;
foreach (system.reflection.propertyinfo property in ob.gettype().getruntimeproperties())
{
worksheet.cells[row, col].value = property.getvalue(ob);//这里已知可以减少一层循环，速度会上升
col++;
}
row++;
}
//自动列宽，由于自动列宽大数据导出严重影响速度，我这里就不开启了，大家可以根据自己情况开启
//worksheet.cells.autofitcolumns();
//保存workbook.
package.save();
}
return true;
}
catch (exception ex)
{
msg = "生成excel失败：" + ex.message;
commonhelper.writeerrorlog("生成excel失败：" + ex.message);
return false;
}
}
#endregion
#region eppluse导入
#region 转换为datatable
public static datatable inputepplusbyexceltodt(fileinfo file)
{
datatable dt = new datatable();
if (file != null)
{
using (excelpackage package = new excelpackage(file))
{
try
{
excelworksheet worksheet = package.workbook.worksheets[1];
dt = worksheettotable(worksheet);
}
catch (exception ex)
{
console.writeline(ex.message);
}
}
}
return dt;
}
/// <summary>
/// 将worksheet转成datatable
/// </summary>
/// <param name="worksheet">待处理的worksheet</param>
/// <returns>返回处理后的datatable</returns>
public static datatable worksheettotable(excelworksheet worksheet)
{
//获取worksheet的行数
int rows = worksheet.dimension.end.row;
//获取worksheet的列数
int cols = worksheet.dimension.end.column;
datatable dt = new datatable(worksheet.name);
datarow dr = null;
for (int i = 1; i <= rows; i++)
{
if (i > 1)
dr = dt.rows.add();
for (int j = 1; j <= cols; j++)
{
//默认将第一行设置为datatable的标题
if (i == 1)
dt.columns.add(getstring(worksheet.cells[i, j].value));
//剩下的写入datatable
else
dr[j - 1] = getstring(worksheet.cells[i, j].value);
}
}
return dt;
}
private static string getstring(object obj)
{
try
{
return obj.tostring();
}
catch (exception)
{
return "";
}
}
#endregion
#region 转换为ienumerable<t>
/// <summary>
/// 从excel中加载数据（泛型）
/// </summary>
/// <typeparam name="t">每行数据的类型</typeparam>
/// <param name="filename">excel文件名</param>
/// <returns>泛型列表</returns>
public static ienumerable<t> loadfromexcel<t>(fileinfo existingfile) where t : new()
{
//fileinfo existingfile = new fileinfo(filename);//如果本地地址可以直接使用本方法，这里是直接拿到了文件
list<t> resultlist = new list<t>();
dictionary<string, int> dictheader = new dictionary<string, int>();
using (excelpackage package = new excelpackage(existingfile))
{
excelworksheet worksheet = package.workbook.worksheets[1];
int colstart = worksheet.dimension.start.column;  //工作区开始列
int colend = worksheet.dimension.end.column;       //工作区结束列
int rowstart = worksheet.dimension.start.row;       //工作区开始行号
int rowend = worksheet.dimension.end.row;       //工作区结束行号
//将每列标题添加到字典中
for (int i = colstart; i <= colend; i++)
{
dictheader[worksheet.cells[rowstart, i].value.tostring()] = i;
}
list<propertyinfo> propertyinfolist = new list<propertyinfo>(typeof(t).getproperties());
for (int row = rowstart + 1; row <=rowend; row++)
{
t result = new t();
//为对象t的各属性赋值
foreach (propertyinfo p in propertyinfolist)
{
try
{
excelrange cell = worksheet.cells[row, dictheader[p.name]]; //与属性名对应的单元格
if (cell.value == null)
continue;
switch (p.propertytype.name.tolower())
{
case "string":
p.setvalue(result, cell.getvalue<string>());
break;
case "int16":
p.setvalue(result, cell.getvalue<int16>());
break;
case "int32":
p.setvalue(result, cell.getvalue<int32>());
break;
case "int64":
p.setvalue(result, cell.getvalue<int64>());
break;
case "decimal":
p.setvalue(result, cell.getvalue<decimal>());
break;
case "double":
p.setvalue(result, cell.getvalue<double>());
break;
case "datetime":
p.setvalue(result, cell.getvalue<datetime>());
break;
case "boolean":
p.setvalue(result, cell.getvalue<boolean>());
break;
case "byte":
p.setvalue(result, cell.getvalue<byte>());
break;
case "char":
p.setvalue(result, cell.getvalue<char>());
break;
case "single":
p.setvalue(result, cell.getvalue<single>());
break;
default:
break;
}
}
catch (keynotfoundexception ex)
{ }
}
resultlist.add(result);
}
}
return resultlist;
} 
#endregion
#endregion
#endregion

2.confighelper添加读取配置文件方法（）

private static iconfiguration _configuration;
static confighelper()
{
//在当前目录或者根目录中寻找appsettings.json文件
var filename = "config/managerconfig.json";
var directory = appcontext.basedirectory;
directory = directory.replace("\\", "/");
var filepath = $"{directory}/{filename}";
if (!file.exists(filepath))
{
var length = directory.indexof("/bin");
filepath = $"{directory.substring(0, length)}/{filename}";
}
var builder = new configurationbuilder()
.addjsonfile(filepath, false, true);
_configuration = builder.build();
}
public static string getsectionvalue(string key)
{
return _configuration.getsection(key).value;
}

3.commonhelper中加入json相关操作

/// <summary>
/// 得到一个包含json信息的jsonresult
/// </summary>
/// <param name="isok">服务器处理是否成功 1.成功 -1.失败 0.没有数据</param>
/// <param name="msg">报错消息</param>
/// <param name="data">携带的额外信息</param>
/// <returns></returns>
public static string getjsonresult(int code, string msg, object data = null)
{
var jsonobj = new { code = code, msg = msg, data = data };
return newtonsoft.json.jsonconvert.serializeobject(jsonobj);
}

三、添加officecontroller控制器和managerconfig配置文件

 

 1.managerconfig配置（）

{
"filemap": {
"imgpath": "d:\\myfile\\templatecore\\templatecore\\wwwroot\\upimg\\",
"imgweb": "http://127.0.0.1:1994/upimg/",
"filepath": "d:\\myfile\\templatecore\\templatecore\\wwwroot\\upfile\\",
"fileweb": "http://127.0.0.1:1994/upfile/",
"videopath": "d:\\myfile\\templatecore\\templatecore\\wwwroot\\upvideo\\",
"videoweb": "http://127.0.0.1:1994/upvideo/",
"web": "http://127.0.0.1:1994/"
}
}

2.officecontroller控制器添加excel处理相应方法

#region epplus导出excel
public string dtexportepplusexcel()
{
string code = "fail";
datatable tbldatas = new datatable("datas");
datacolumn dc = null;
dc = tbldatas.columns.add("id", type.gettype("system.int32"));
dc.autoincrement = true;//自动增加
dc.autoincrementseed = 1;//起始为1
dc.autoincrementstep = 1;//步长为1
dc.allowdbnull = false;//
dc = tbldatas.columns.add("product", type.gettype("system.string"));
dc = tbldatas.columns.add("version", type.gettype("system.string"));
dc = tbldatas.columns.add("description", type.gettype("system.string"));
datarow newrow;
newrow = tbldatas.newrow();
newrow["product"] = "大话西游";
newrow["version"] = "2.0";
newrow["description"] = "我很喜欢";
tbldatas.rows.add(newrow);
newrow = tbldatas.newrow();
newrow["product"] = "梦幻西游";
newrow["version"] = "3.0";
newrow["description"] = "比大话更幼稚";
tbldatas.rows.add(newrow);
newrow = tbldatas.newrow();
newrow["product"] = "西游记";
newrow["version"] = null;
newrow["description"] = "";
tbldatas.rows.add(newrow);
for (int x = 0; x < 100000; x++)
{
newrow = tbldatas.newrow();
newrow["product"] = "西游记"+x;
newrow["version"] = ""+x;
newrow["description"] = x;
tbldatas.rows.add(newrow);
}
string filename = "myexcel.xlsx";
string[] namestrs = new string[tbldatas.rows.count];//每列名，这里不赋值则表示取默认
string savepath = "wwwroot/excel";//相对路径
string msg = "excel/"+ filename;//文件返回地址，出错就返回错误信息。
system.diagnostics.stopwatch watch = new system.diagnostics.stopwatch();
watch.start();  //开始监视代码运行时间
bool b = officehelper.dtexportepplusexcel(tbldatas, savepath, filename, namestrs, ref msg) ;
timespan timespan = watch.elapsed;  //获取当前实例测量得出的总时间
watch.stop();  //停止监视
if (b)
{
code = "success";
}
return "{\"code\":\"" + code + "\",\"msg\":\"" + msg + "\",\"timeseconds\":\"" + timespan.totalseconds + "\"}";
}
public string modelexportepplusexcel()
{
string code = "fail";
list<article> articlelist = new list<article>();
for (int x = 0; x < 100000; x++)
{
article article = new article();
article.context = "内容："+x;
article.id = x + 1;
article.createtime = datetime.now;
article.title = "标题：" + x;
articlelist.add(article);
}
string filename = "mymodelexcel.xlsx";
string[] namestrs = new string[4] {"id", "title", "context", "createtime" };//按照模型先后顺序，赋值需要的名称
string savepath = "wwwroot/excel";//相对路径
string msg = "excel/" + filename;//文件返回地址，出错就返回错误信息。
system.diagnostics.stopwatch watch = new system.diagnostics.stopwatch();
watch.start();  //开始监视代码运行时间
bool b = officehelper.modelexportepplusexcel(articlelist, savepath, filename, namestrs, ref msg);
timespan timespan = watch.elapsed;  //获取当前实例测量得出的总时间
watch.stop();  //停止监视
if (b)
{
code = "success";
}
return "{\"code\":\"" + code + "\",\"msg\":\"" + msg + "\",\"timeseconds\":\"" + timespan.totalseconds + "\"}";
}
#endregion
#region epplus导出数据
public async task<string> excelimportepplusdtjsonasync() {
iformfilecollection files = request.form.files;
datatable articles = new datatable();
int code = 0;
string msg = "失败！";
var file = files[0];
string path = confighelper.getsectionvalue("filemap:filepath") + files[0].filename;
using (filestream fs = system.io.file.create(path))
{
await file.copytoasync(fs);
fs.flush();
}
system.diagnostics.stopwatch watch = new system.diagnostics.stopwatch();
watch.start();  //开始监视代码运行时间
fileinfo fileexcel = new fileinfo(path);
articles = officehelper.inputepplusbyexceltodt(fileexcel);
timespan timespan = watch.elapsed;  //获取当前实例测量得出的总时间
watch.stop();  //停止监视
code = 1; msg = "成功！";
string json = commonhelper.getjsonresult(code, msg, new { articles, timespan });
return json;
}
public async task<string> excelimportepplusmodeljsonasync()
{
iformfilecollection files = request.form.files;
list<article> articles = new list<article>();
int code = 0;
string msg = "失败！";
var file = files[0];
string path = confighelper.getsectionvalue("filemap:filepath")+files[0].filename;
using (filestream fs = system.io.file.create(path))
{
await file.copytoasync(fs);
fs.flush();
}
system.diagnostics.stopwatch watch = new system.diagnostics.stopwatch();
watch.start();  //开始监视代码运行时间
fileinfo fileexcel = new fileinfo(path);
articles=officehelper.loadfromexcel<article>(fileexcel).tolist();
timespan timespan = watch.elapsed;  //获取当前实例测量得出的总时间
watch.stop();  //停止监视
code = 1;msg = "成功！";
string json = commonhelper.getjsonresult(code, msg, new { articles, timespan });
return json;
}
#endregion

四、前端请求设计

<script type="text/javascript">
function dtepplusexport() {
$.ajax({
type: "post",
contenttype: 'application/json',
url: '/office/dtexportepplusexcel',
datatype: 'json',
async: false,
success: function (data) {
if (data.code == "success") {
window.open("../" + data.msg);
$("#dtepplusexcel").text("导出10w条耗时"+data.timeseconds+"秒");
}
console.log(data.code);
},
error: function (xhr) {
console.log(xhr.responsetext);
}
});
}
function modelepplusexport() {
$.ajax({
type: "post",
contenttype: 'application/json',
url: '/office/modelexportepplusexcel',
datatype: 'json',
async: false,
success: function (data) {
if (data.code == "success") {
window.open("../" + data.msg);
$("#modelepplusexcel").text("导出10w条耗时"+data.timeseconds+"秒");
}
console.log(data.code);
},
error: function (xhr) {
console.log(xhr.responsetext);
}
});
}
function exceltomodel() {
$("#filename").text(document.getelementbyid("exceltomodel").files[0].name);
var formdata = new formdata();  
formdata.append('file',document.getelementbyid("exceltomodel").files[0]);  
$.ajax({
url: "../office/excelimportepplusmodeljson",
type: "post",
data: formdata,
contenttype: false,
processdata: false,
datatype: "json",
success: function(result){
if (result.code == 1) {
console.log(result.data.articles);
$("#tomodel").text("导入10w条耗时"+result.data.timespan+"秒");
}
}
});
}
function exceltodt() {
$("#filename1").text(document.getelementbyid("exceltodt").files[0].name);
var formdata = new formdata();  
formdata.append('file',document.getelementbyid("exceltodt").files[0]);  
$.ajax({
url: "../office/excelimportepplusdtjson",
type: "post",
data: formdata,
contenttype: false,
processdata: false,
datatype: "json",
success: function(result){
if (result.code == 1) {
console.log(result.data.articles);
$("#todt").text("导入10w条耗时"+result.data.timespan+"秒");
}
}
});
}
</script> 
<style>
body {
margin:auto;
text-align:center;
}
</style>
<div style="margin-top:30px;">
<h3>epplus导出案例</h3>
<button type="button" class="btn btn-default" id="dtepplusexcel" onclick="dtepplusexport();">excel导出测试（datatable）</button>
<button type="button" class="btn btn-default" id="modelepplusexcel" onclick="modelepplusexport();">excel导出测试（model）</button>
<h3>epplus导入案例</h3>
<div class="col-xs-12 col-sm-4 col-md-4" style="width:100%;">
<div class="file-container" style="display:inline-block;position:relative;overflow: hidden;vertical-align:middle">
<label>model:</label>
<button class="btn btn-success fileinput-button" type="button">上传</button>
<input type="file" accept=".xls,.xlsx" id="exceltomodel" onchange="exceltomodel(this.files[0])" style="position:absolute;top:0;left:0;font-size:34px; opacity:0">
</div>
<span id="filename" style="vertical-align: middle">未上传文件</span>
<span id="tomodel"></span>
</div><br /><br />
<div class="col-xs-12 col-sm-4 col-md-4" style="width:100%;">
<div class="file-container" style="display:inline-block;position:relative;overflow: hidden;vertical-align:middle">
<label>datatable:</label>
<button class="btn btn-success fileinput-button" type="button">上传</button>
<input type="file" accept=".xls,.xlsx" id="exceltodt" onchange="exceltodt(this.files[0])" style="position:absolute;top:0;left:0;font-size:34px; opacity:0">
</div>
<span id="filename1" style="vertical-align: middle">未上传文件</span>
<span id="todt"></span>
</div>
</div>

上面的上传为了美观用了bootstrap的样式，如果你喜欢原生可以把两个导入案例通过如下代码替换，其它条件无需改变。

<label>model:</label><input accept=".xls,.xlsx" type="file" id="exceltomodel" style="display:initial;" /><button id="tomodel" onclick="exceltomodel();" >上传</button><br />
<label>datatable:</label><input accept=".xls,.xlsx" type="file" id="exceltodt" style="display:initial;" /><button id="todt" onclick="exceltodt();">上传</button>

五、那么看下效果吧，我们这里模拟了10w条数据进行了简单实验，一般要求满足应该没什么问题。

开源地址 动动小手，点个推荐吧！

 

注意：我们机遇屋该项目将长期为大家提供asp.net core各种好用demo，旨在帮助.net开发者提升竞争力和开发速度，建议尽早收藏该模板集合项目。