[HttpPost]
    public async Task<IActionResult> Post()
        var request = HttpContext.Request;
        // validation of Content-Type
        // 1. first, it must be a form-data request
        // 2. a boundary should be found in the Content-Type
        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();
        // This sample try to get the first file from request and save it
        // Make changes according to your needs in actual use
        while (section != null)
            var hasContentDispositionHeader = ContentDispositionHeaderValue.TryParse(section.ContentDisposition,
                out var contentDisposition);
            if (hasContentDispositionHeader && contentDisposition.DispositionType.Equals("form-data") &&
                !string.IsNullOrEmpty(contentDisposition.FileName.Value))
                await _uploader.UploadAsync(section.Body);
                return Ok();
            section = await reader.ReadNextSectionAsync();
        // If the code runs to this location, it means that no files have been saved
        return BadRequest("No files data in the request.");
    }

        var tenMB = 10485760;
        services.Configure<FormOptions>(options =>
            options.MultipartBodyLengthLimit = tenMB;
        });