问将Excel上载到Web .net 6、前缀和后缀WebKitFormBoundary

EN

[HttpPost, Route("UploadExcel")]
public async Task<IActionResult> UploadExcel()
    {
        var request = HttpContext.Request;

        if (!request.HasFormContentType ||
          !MediaTypeHeaderValue.TryParse(request.ContentType, out var mediaTypeHeader) ||
          string.IsNullOrEmpty(mediaTypeHeader.Boundary.Value))
        {
            return new UnsupportedMediaTypeResult();
        }

        var reader = new MultipartReader(mediaTypeHeader.Boundary.Value, request.Body);
        var section = await reader.ReadNextSectionAsync();

        while (section != null)
        {
            var hasContentDispositionHeader = ContentDispositionHeaderValue.TryParse(section.ContentDisposition,
                out var contentDisposition);

            if (hasContentDispositionHeader && contentDisposition.DispositionType.Equals("form-data") &&
                !string.IsNullOrEmpty(contentDisposition.FileName.Value))
            {
                var fileuploadPath = "D:\\test\\test.xlsx";

                using (var targetStream = System.IO.File.Create(fileuploadPath))
                {
                    await section.Body.CopyToAsync(targetStream);
                }

                return Ok();
            }

            section = await reader.ReadNextSectionAsync();
        }

        return Ok();
    }