.net core下对于附件上传下载的实现

[HttpPost("upload")]
//[DisableRequestSizeLimit] //禁用http限制大小
[RequestSizeLimit(100*1024*1024)] //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();
    }
}