.net core下对于附件上传下载的实现示例

[HttpPost("upload")]
//[DisableRequestSizeLimit] //禁用http限制大小
[RequestSizeLimit(10010241024)] //限制http大小
public async Task<IActionResult> Post(List<IFormFile> files)
{
  try
  {
    if (files == null || !files.Any())
      return AssertNotFound(new ResponseFileResult { Result = false, Code = ResponseCode.InvalidParameters, ErrorMessage = "附件不能为空" });


    string filePath = Path.Combine(Directory.GetCurrentDirectory(), BASEFILE, $@"Template");
    if (!Directory.Exists(filePath))
      Directory.CreateDirectory(filePath);

    var result = new ResponseFileResult();
    var fileList = new List<FileResultModel>();

    foreach (var file in files)
    {
      var fileModel = new FileResultModel();
      var fileName = ContentDispositionHeaderValue
              .Parse(file.ContentDisposition)
              .FileName
              .Trim('"');
      var newName = Guid.NewGuid().ToString() + Path.GetExtension(fileName);
      var filefullPath = Path.Combine(filePath, $@"{newName}");

      using (FileStream fs = new FileStream(filefullPath, FileMode.Create))//System.IO.File.Create(filefullPath)
      {
        file.CopyTo(fs);
        fs.Flush();
      }


      fileList.Add(new FileResultModel { Name = fileName, Size = file.Length, Url = $@"/file/download?fileName={newName}" });
    }
    result.FileResultList = fileList;
    return AssertNotFound(result);
  }
  catch(Exception ex)
  {
    return AssertNotFound(new ResponseFileResult { Result = false, Code = ResponseCode.UnknownException, ErrorMessage = ex.Message });
  }
}

[HttpGet("download")]
public async Task<IActionResult> Get(string fileName)
{
  try
  {
    var addrUrl = Path.Combine(Directory.GetCurrentDirectory(), BASEFILE, $@"{fileName}");
    FileStream fs = new FileStream(addrUrl, FileMode.Open);
    return File(fs, "application/vnd.android.package-archive", fileName);
  }
  catch(Exception ex)
  {
    return NotFound();
  }
}