Net Core 3.0 EPPlus对Excel导入导出

1：EPPlus.core 弃用的情况下（EPPlus.core 不支持net Core3.0）可使用 EPPlus 包   【因文件超10M，在最下面提供百度网盘地址】

                   

2：EPPlus 引用方式

      A）工具---->NuGet 包管理器--->管理解决方案的NuGet程序包--->搜索安装

      B） 工具---->NuGet 包管理器--->程序包管理器控制台--->Install-Package EPPlus

            

 3：导出 

  a:工具方法

        /// <summary>
        /// 导出
        /// </summary>
        /// <param name="ePPlus"></param>
        /// <returns></returns>
        public static MemoryStream Export(ICollection<EPPlus> ePPlus)
        {
            MemoryStream stream = new MemoryStream();
            ExcelPackage package = new ExcelPackage(stream);

            package.Workbook.Worksheets.Add("EPPlus");
            ExcelWorksheet sheet = package.Workbook.Worksheets[0];

            #region write header
            sheet.Cells[1, 1].Value = "用户名";
            sheet.Cells[1, 2].Value = "年龄";
            sheet.Cells[1, 3].Value = "性别";
            sheet.Cells[1, 4].Value = "成绩";

            using (ExcelRange range = sheet.Cells[1, 1, 1, 4])
            {
                range.Style.Fill.PatternType = OfficeOpenXml.Style.ExcelFillStyle.Solid;
                range.Style.Fill.BackgroundColor.SetColor(Color.Gray);
                range.Style.Border.Bottom.Style = OfficeOpenXml.Style.ExcelBorderStyle.Thick;
                range.Style.Border.Bottom.Color.SetColor(Color.Black);
                range.AutoFitColumns(4);
            }
            #endregion

            #region write content
            int pos = 2;
            foreach (EPPlus s in ePPlus)
            {
                sheet.Cells[pos, 1].Value = s.Name;
                sheet.Cells[pos, 2].Value = s.Age;
                sheet.Cells[pos, 3].Value = s.Gender;
                sheet.Cells[pos, 4].Value = s.Achievement;

                using (ExcelRange range = sheet.Cells[pos, 1, pos, 4])
                {
                    range.Style.Border.Bottom.Style = OfficeOpenXml.Style.ExcelBorderStyle.Thin;
                    range.Style.Border.Bottom.Color.SetColor(Color.Black);
                    range.Style.HorizontalAlignment = OfficeOpenXml.Style.ExcelHorizontalAlignment.Left;
                }

                pos++;
            }
            #endregion

            package.Save();

            return stream;
        }

  b:Controller

private const string contentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
private const string fileDownloadName = "EPPlusDemo.xlsx";
 
/// <summary>
/// 导出
/// </summary>
/// <returns></returns>
public FileResult Export()
{
   MemoryStream stream = EPPlusTool.Export(EPPlusTool.EPPlus);
   return File(stream.ToArray(), contentType, fileDownloadName);
}

4：导入以及下载Excel

   a:工具方法

        /// <summary>
        /// 导入
        /// </summary>
        /// <param name="package"></param>
        /// <param name="worksheet"></param>
        /// <returns></returns>
        public static ICollection<EPPlus> Import(ExcelPackage package, ExcelWorksheet worksheet)
        {
            ICollection<EPPlus> ePPlus = new List<EPPlus>();

            var rowCount = worksheet.Dimension?.Rows;
            var colCount = worksheet.Dimension?.Columns;
            #region check excel format
            if (!rowCount.HasValue || !colCount.HasValue)
            {
                return ePPlus;
                //return "文档表头或内容为空，请下载对应文档！";
            }
            if(!worksheet.Cells[1,1].Value.Equals("Name") ||
                !worksheet.Cells[1, 2].Value.Equals("Age") ||
                !worksheet.Cells[1, 3].Value.Equals("Gender") ||
                !worksheet.Cells[1, 4].Value.Equals("Achievement") ||
                !worksheet.Cells[2, 1].Value.Equals("用户名") ||
                !worksheet.Cells[2, 2].Value.Equals("年龄") ||
                !worksheet.Cells[2, 3].Value.Equals("性别") ||
                !worksheet.Cells[2, 4].Value.Equals("成绩"))
            {
                return ePPlus;
                //return "文档表头或内容不对应，请下载对应文档！";
            }
            #endregion
            #region  read datas  若读取数据库，可写事务拼接sql执行，前端重新加载页面即可
            for(int i=3; i<= rowCount; i++)
            {
                ePPlus.Add(new EPPlus
                {
                    Name = worksheet.Cells[i, 1].Value.ToString(),
                    Age = Convert.ToInt32(worksheet.Cells[i, 2].Value.ToString()),
                    Gender = (Gender)Enum.Parse(typeof(Gender), worksheet.Cells[i, 3].Value.ToString()),
                    Achievement = Convert.ToDouble(worksheet.Cells[i,4].Value.ToString())
                }) ;
            }
            #endregion
            return ePPlus;
        }

  b:Controller

        public async Task<IActionResult>  Import(IFormFile file)
        {
            if (file == null || file.Length==0)
            {
                ViewBag.Message = "The document is empty, please select a file!";
            }
            else
            {
                using(var memoryStream=new MemoryStream())
                {
                    await file.CopyToAsync(memoryStream).ConfigureAwait(false);
                    using(var package=new ExcelPackage(memoryStream))
                    {
                        var worksheet = package.Workbook.Worksheets[0]; // Tip: To access the first worksheet, try index 1, not 0
                        ICollection<EPPlus> ePPlus = EPPlusTool.Import(package, worksheet);
                        EPPlusTool.EPPlus = ePPlus;
                    }
                }
            }

            ViewBag.EPPlus = EPPlusTool.EPPlus;
            return View("Index");
        }

5：cshtml页面代码

@{
    Layout = null;
}

<!DOCTYPE html>

<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>Index</title>
    <script src="~/lib/bootstrap/dist/js/bootstrap.js"></script>
    <link href="~/lib/bootstrap/dist/css/bootstrap.css" rel="stylesheet" />
    <script src="~/lib/jquery/dist/jquery.min.js"></script>
    <script src="~/lib/bootstrap/dist/js/bootstrap.min.js"></script>
    <link href="~/lib/bootstrap/dist/css/bootstrap-reboot.min.css" />
</head>
<body>
    <div style="80%;margin:0 auto;margin-top:50px;">
        @Html.ActionLink("导出", "Export", "EPPlus", null, new { @class = "btn btn-primary", @style = "margin-left:86%" })
        <button type="button" class="btn btn-success" data-toggle="modal" data-target="#myModal">导入</button>
    </div>
    <table class="table table-bordered" style="80%;margin:0 auto;margin-top:20px">
        <thead>
            <tr>
                <td>用户名</td>
                <td>年龄</td>
                <td>性别</td>
                <td>成绩</td>
            </tr>
        </thead>
        <tbody>
            @foreach (EPPlus ePPlus in ViewBag.EPPlus)
            {
                <tr>
                    <td>@ePPlus.Name</td>
                    <td>@ePPlus.Age</td>
                    <td>@ePPlus.Gender</td>
                    <td>@ePPlus.Achievement</td>
                </tr>
            }
        </tbody>
    </table>

    @*模态框*@
    <form method="post" asp-action="Import" asp-controller="EPPlus" enctype="multipart/form-data">
        <div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
            <div class="modal-dialog">
                <div class="modal-content" style="height: 100%; 450px;margin-top: 20px;">
                    <div class="modal-header">
                        <button type="button" class="close" data-dismiss="modal"
                                aria-hidden="true">
                            ×
                        </button>
                    </div>
                    <table class="table table-borderless" style="100%">
                        <tr>
                            <td><a href="~/EPPlus/EPPlusDemo.xlsx">下载模板</a></td>
                        </tr>
                        <tr>
                            <td>上传</td>
                        </tr>
                        <tr>
                            <td><input type="file" name="file" /> <span style="color:red;">@ViewBag.Message</span></td>
                        </tr>

                    </table>

                    <div style="margin-top:30px;margin-bottom:10px;margin-left:150px">
                        <button type="submit" class="btn btn-success" style="margin-right:5px" data-dismiss="none" id="btu-Ses">导入</button>
                        <button type="button" class="btn btn-light" data-dismiss="modal">返回</button>

                    </div>
                </div>
            </div>
        </div>
    </form>
    <script>
        //function Chuan() {
        //    $.ajax({
        //        url: "/EPPlus/Import",
        //        type: "post",
        //        data: {
        //            c: $(".file")
        //        },
        //        success: function (data) {
        //            $("#btu-Ses").attr("data-dismiss", "modal")
        //        },
        //        error: function () {
        //            alert("不执行");
        //        }
        //    })
        //}
    </script>
</body>
</html>

总结：

链接：https://pan.baidu.com/s/1VuGl26ugdPrYmEnB4bdtuQ 
提取码：77dm

由于本人为菜鸟一枚，有更有效的完指导，望提醒，谢谢。