ASP.NET Core 导入导出Excel xlsx 文件

ASP.NET Core 使用EPPlus.Core导入导出Excel xlsx 文件，EPPlus.Core支持Excel 2007/2010 xlsx文件导入导出，可以运行在Windows, Linux和Mac。

EPPlus.Core 是基于EPPlus 更改而来，在Linux 下需要安装libgdiplus 。

EPPlus：http://epplus.codeplex.com/

EPPlus.Core：https://github.com/VahidN/EPPlus.Core

下面在ASP.NET Core 中导入导出Excel xlsx 文件。

新建项目

新建一个ASP.NET Core Web Application 项目ASPNETCoreExcel，选择Web 应用程序不进行身份验证。

然后添加EPPlus.Core 引用。

使用NuGet 命令行：

Install-Package EPPlus.Core

也可以使用NuGet包管理器安装。

导出xlsx文件

新建一个XlsxController ，添加Export 操作。

    public class XlsxController : Controller
    {
        private IHostingEnvironment _hostingEnvironment;

        public XlsxController(IHostingEnvironment hostingEnvironment)
        {
            _hostingEnvironment = hostingEnvironment;
        }
        public IActionResult Index()
        {
            return View();
        }

        public IActionResult Export()
        {
            string sWebRootFolder = _hostingEnvironment.WebRootPath;
            string sFileName = $"{Guid.NewGuid()}.xlsx";
            FileInfo file = new FileInfo(Path.Combine(sWebRootFolder, sFileName));
            using (ExcelPackage package = new ExcelPackage(file))
            {
                // 添加worksheet
                ExcelWorksheet worksheet = package.Workbook.Worksheets.Add("aspnetcore");
                //添加头
                worksheet.Cells[1, 1].Value = "ID";
                worksheet.Cells[1, 2].Value = "Name";
                worksheet.Cells[1, 3].Value = "Url";
                //添加值
                worksheet.Cells["A2"].Value = 1000;
                worksheet.Cells["B2"].Value = "LineZero";
                worksheet.Cells["C2"].Value = "http://www.cnblogs.com/linezero/";

                worksheet.Cells["A3"].Value = 1001;
                worksheet.Cells["B3"].Value = "LineZero GitHub";
                worksheet.Cells["C3"].Value = "https://github.com/linezero";
                worksheet.Cells["C3"].Style.Font.Bold = true;

                package.Save(); 
            }
            return File(sFileName, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
        }
    }

通过依赖注入获取HostingEnvironment，对应可以获取程序的相关目录及属性。

然后添加Index 视图增加一个链接导出Excel

@{ 
}
<h2>ASP.NET Core 导入导出Excel xlsx 文件</h2>
<a asp-action="Export">导出Excel</a>

点击导出文件，打开结果如下。

导入xlsx文件

在index视图中添加一个上传文件，添加Import操作。

Index.cshtml

@{ 
}
<h2>ASP.NET Core 导入导出Excel xlsx 文件</h2>
<a asp-action="Export">导出Excel</a>
<hr />
<form enctype="multipart/form-data" method="post" asp-action="Import">
    <input type="file" name="excelfile" />
    <input type="submit" value="上传" />
</form>

        [HttpPost]
        public IActionResult Import(IFormFile excelfile)
        {
            string sWebRootFolder = _hostingEnvironment.WebRootPath;
            string sFileName = $"{Guid.NewGuid()}.xlsx";
            FileInfo file = new FileInfo(Path.Combine(sWebRootFolder, sFileName));
            try
            {
                using (FileStream fs = new FileStream(file.ToString(), FileMode.Create))
                {
                    excelfile.CopyTo(fs);
                    fs.Flush();
                }
                using (ExcelPackage package = new ExcelPackage(file))
                {
                    StringBuilder sb = new StringBuilder();
                    ExcelWorksheet worksheet = package.Workbook.Worksheets[1];
                    int rowCount = worksheet.Dimension.Rows;
                    int ColCount = worksheet.Dimension.Columns;
                    bool bHeaderRow = true;
                    for (int row = 1; row <= rowCount; row++)
                    {
                        for (int col = 1; col <= ColCount; col++)
                        {
                            if (bHeaderRow)
                            {
                                sb.Append(worksheet.Cells[row, col].Value.ToString() + "\t");
                            }
                            else
                            {
                                sb.Append(worksheet.Cells[row, col].Value.ToString() + "\t");
                            }
                        }
                        sb.Append(Environment.NewLine);
                    }
                    return Content(sb.ToString());
                }
            }
            catch (Exception ex)
            {
                return Content(ex.Message);
            }
        }