web api 基于Epplus包 导入excel数据(自定义映射表格列名到实体)
导出excel的请看上一篇
api接口代码如下，有两种，一种是直接以文件流的形式，一种是文件url地址路径，其实本质上一样，拿到url还需要通过httpclient再转换成Stream
[HttpPost]
public IActionResult Import([FromForm] IFormFile file)
{
var maxsize = file.Length;
var suffix = Path.GetExtension(file.FileName);
if (".xlsx".IndexOf(suffix) >= 0)
{
Stream fs = file.OpenReadStream();
//此处泛型为需要隐射的实体类
Import2Excel<Gogo> it = new Import2Excel<Gogo>();
//这里自定义将excel的表头或列名字映射到对应实体
it.ForMember("姓名", e => e.Name);
it.ForMember("身份号", e => e.Card);
it.ForMember("年龄", e => e.Age);
it.ForMember("添加时间", e => e.CreateTime);
//通过此方法直接将流文件加载到内存
IList<Gogo> list = it.LoadFromExcel(fs);
//这一段是接口如果传入的参数是url文件路径而不是文件流的话，需要转换
//using (var web = new WebClient())
//{
// string urlDecode = System.Web.HttpUtility.UrlDecode(url);
// var stream = web.OpenRead(urlDecode);
//}
//剩下的请自行操作SQL或数据库上下文处理数据
return StatusCode(200, list);
}
else
return StatusCode(415, new { msg = "仅支持.xlsx的文件" });
}
//继承XlsRow这个类是为了方便打印导入的错误数据信息，不需要可忽略(需要改动Import2Excel.cs类约束)
public class Gogo: XlsRow
{
public string Name { get; set; }
public string Card { get; set; }
public int Age { get; set; }
public DateTime CreateTime { get; set; }
}
下面附上导入帮助类，这个类是我借鉴某位大神的博客，因为实践发现原来的是静态内存无法回收，所以小小调整了一下， 本来想附上源博客链接的，结果由于时间过去太久找不到原来那片文章，所以，还望看到的小伙伴们告知我一声哈
Import2Excel.cs
using OfficeOpenXml;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Linq.Expressions;
using System.Reflection;
namespace WinkSign.Domain.Common.Utils
{
public class Import2Excel<T> where T : XlsRow, new()
{
private List<XlsEntity> xlsHeader = new List<XlsEntity>();
#region 初始化转换形式
public void ForMember(Expression<Func<T, object>> entityExpression, Func<string, object> func)
{
XlsEntity xlsEntity = new XlsEntity();
xlsEntity.EntityName = GetPropertyName(entityExpression);
xlsEntity.ColumnName = xlsEntity.EntityName;
xlsEntity.ConvertFunc = func;
xlsHeader.Add(xlsEntity);
}
public void ForMember(string columnName, Expression<Func<T, object>> entityExpression)
{
XlsEntity xlsEntity = new XlsEntity();
xlsEntity.ColumnName = columnName;
xlsEntity.EntityName = GetPropertyName(entityExpression);
xlsHeader.Add(xlsEntity);
}
public void ForMember(string columnName, string entityName)
{
XlsEntity xlsEntity = new XlsEntity();
xlsEntity.ColumnName = columnName;
xlsEntity.EntityName = entityName;
xlsHeader.Add(xlsEntity);
}
public void ForMember(string columnName, string entityName, Func<string, object> func)
{
XlsEntity xlsEntity = new XlsEntity();
xlsEntity.ColumnName = columnName;
xlsEntity.EntityName = entityName;
xlsEntity.ConvertFunc = func;
xlsHeader.Add(xlsEntity);
}
public void ForMember(string columnName, Expression<Func<T, object>> entityExpression, Func<string, object> func)
{
XlsEntity xlsEntity = new XlsEntity();
xlsEntity.ColumnName = columnName;
xlsEntity.EntityName = GetPropertyName(entityExpression);
xlsEntity.ConvertFunc = func;
xlsHeader.Add(xlsEntity);
}
#endregion
///