<form method="post" enctype="multipart/form-data" asp-controller="UploadFiles" asp-action="Index"><div class="form-group"><div class="col-md-10"><p>Upload one or more files using this form:</p><input type="file" name="files" multiple /></div></div><div class="form-group"><div class="col-md-10"><input type="submit" value="上传" /></div></div>
</form>

public interface IFormFile
{string ContentType { get; }string ContentDisposition { get; }IHeaderDictionary Headers { get; }long Length { get; }string Name { get; }string FileName { get; }Stream OpenReadStream();void CopyTo(Stream target);Task CopyToAsync(Stream target, CancellationToken cancellationToken = null);
}

        [HttpPost("UploadFiles")]public async Task<IActionResult> Post(List<IFormFile> files){long size = files.Sum(f => f.Length);// full path to file in temp locationvar filePath = Path.GetTempFileName();foreach (var formFile in files){if (formFile.Length > 0){using (var stream = new FileStream(filePath, FileMode.Create)){await formFile.CopyToAsync(stream);}}}return Ok(new { count = files.Count, size, filePath });}

        public IActionResult UploadFiles(List<IFormFile> files){long size = 0;foreach (var file in files){//var fileName = file.FileName;var fileName = ContentDispositionHeaderValue.Parse(file.ContentDisposition).FileName.Trim('"');fileName = hostingEnv.WebRootPath + $@"\{fileName}";size += file.Length;using (FileStream fs = System.IO.File.Create(fileName)){file.CopyTo(fs);fs.Flush();}}ViewBag.Message = $"{files.Count}个文件 /{size}字节上传成功!";return View();}

<form method="post" enctype="multipart/form-data" asp-controller="Upload" asp-action="UploadFiles">
</form>

@addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers

         <div class="row"><div class="form-group"><div class="col-md-10"><p>使用表单上传多个文件</p><input type="file" id="files" name="files" multiple />@ViewBag.Message</div></div></div><div class="row"><div class="form-group"><div class="col-md-10"><input type="button"  id="upload" class="btn btn-success" style="cursor:pointer;width:100px;" value="上传" /></div></div></div>

         $(function () {$("#upload").click(function (evt) {var fileUpload = $("#files").get(0);var files = fileUpload.files;var data = new FormData();for (var i = 0; i < files.length ; i++) {data.append(files[i].name, files[i]);}$.ajax({type: "POST",url: "/Upload/UploadFiles",contentType: false,processData: false,data: data,success: function (message) {alert(message);},error: function () {alert("上传文件出现错误！");}});});});

        public IActionResult UploadFiles(){long size = 0;var files = Request.Form.Files;foreach (var file in files){//var fileName = file.FileName;var fileName = ContentDispositionHeaderValue.Parse(file.ContentDisposition).FileName.Trim('"');fileName = hostingEnv.WebRootPath + $@"\{fileName}";size += file.Length;using (FileStream fs = System.IO.File.Create(fileName)){file.CopyTo(fs);fs.Flush();}}ViewBag.Message = $"{files.Count}个文件 /{size}字节上传成功!";return View();}

        [HttpGet][Route("Export")]public string Export(){string sWebRootFolder = _hostingEnvironment.WebRootPath;string sFileName = @"Jeffcky.xlsx";string URL = string.Format("{0}://{1}/{2}", Request.Scheme, Request.Host, sFileName);FileInfo file = new FileInfo(Path.Combine(sWebRootFolder, sFileName));if (file.Exists){file.Delete();file = new FileInfo(Path.Combine(sWebRootFolder, sFileName));}using (ExcelPackage package = new ExcelPackage(file)){// add a new worksheetExcelWorksheet worksheet = package.Workbook.Worksheets.Add("Jeffcky");//sheet headerworksheet.Cells[1, 1].Value = "ID";worksheet.Cells[1, 2].Value = "Name";worksheet.Cells[1, 3].Value = "Age";//Add valuesworksheet.Cells["A2"].Value = 1000;worksheet.Cells["B2"].Value = "Jeffcky1";worksheet.Cells["C2"].Value = 18;worksheet.Cells["A3"].Value = 1001;worksheet.Cells["B3"].Value = "Jeffcky2";worksheet.Cells["C3"].Value = 19;package.Save(); //Save the workbook.
            }return URL;}

        public IActionResult Export(){var properties = new PropertyByName<Person>[]{new PropertyByName<Person>("Id",d=>d.Id),new PropertyByName<Person>("Name",d=>d.Name),new PropertyByName<Person>("Age",d=>d.Age)};var list = new List<Person>(){new Person() {Id=1,Name="Jeffcky1",Age=18 },new Person() {Id=2,Name="Jeffcky2",Age=19 },new Person() {Id=3,Name="Jeffcky3",Age=20 },new Person() {Id=4,Name="Jeffcky4",Age=21 },new Person() {Id=5,Name="Jeffcky5",Age=22 }};var bytes = _ExportManager.ExportToXlsx<Person>(properties, list);return new FileContentResult(bytes, MimeTypes.TextXlsx);}

        public string Import(){string sWebRootFolder = _hostingEnvironment.WebRootPath;string sFileName = @"Jeffcky.xlsx";FileInfo file = new FileInfo(Path.Combine(sWebRootFolder, sFileName));try{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 sb.ToString();}}catch (Exception ex){return "Some error occured while importing." + ex.Message;}}

        [HttpGet][Route("Import")]public void Import(){string sWebRootFolder = _hostingEnvironment.WebRootPath;string sFileName = @"Jeffcky.xlsx";FileStream fs = new FileStream(Path.Combine(sWebRootFolder, sFileName), FileMode.Open, FileAccess.Read, FileShare.Read);var list = _ImportManager.ImportPersonFromXlsx(fs);}