.NET: file uploading to server using http

.Net Web Api File; Upload,Download, Image Review and SendCloud services

Web.config

<appSettings> <!--FileService-->    <add key="ftpUserName" value="fooUserName" />    <add key="ftpPassword" value="fooPass" /><!--FileController-->    <add key="fileServiceLocalPath" value="~/App_Data/Upload" />    <add key="fileServiceStoragePath" value="fooFtpAddress" />    <add key="useCloud" value="false" /></appSettings>

File Controller with Authentication

[Authorize][RoutePrefix("api/File")] public class FileController : ApiController    {        IFileService fileService = null;        public FileController(IFileService _fileService)        {            fileService = _fileService;        }        [Route("Upload"), HttpPost]        public async Task<IHttpActionResult> Upload()        {            #region Condition            if (!Request.Content.IsMimeMultipartContent())                return Content(HttpStatusCode.UnsupportedMediaType, Messages.FUW0001);            #endregion            /// `localPath` and `useCloud` is get from Web.Config.            string localPath = HostingEnvironment.MapPath(ConfigurationManager.AppSettings["fileServiceLocalPath"]);            bool useCloud = Convert.ToBoolean(ConfigurationManager.AppSettings["useCloud"]);            var provider = new MultipartFormDataStreamProvider(localPath);            try            {                /// Loads the files into the local storage.                await Request.Content.ReadAsMultipartAsync(provider);                /// Check is exist valid file.                if (provider.FileData.Count == 0)                    return BadRequest(Messages.FUE0001 /*Message Type FUE001 = File Not Found */);                IList<FileDto> modelList = new List<FileDto>();                foreach (MultipartFileData file in provider.FileData)                {                    string originalName = file.Headers.ContentDisposition.FileName;                    if (originalName.StartsWith("\"") && originalName.EndsWith("\""))                    {                        originalName = originalName.Trim('"');                    }                    if (originalName.Contains(@"/") || originalName.Contains(@"\"))                    {                        originalName = Path.GetFileName(originalName);                    }                    /// File information storage my database.                    FileDto fileDto = new FileDto                    {                        OriginalName = Path.GetFileNameWithoutExtension(originalName),                        StorageName = Path.GetFileName(file.LocalFileName),                        Extension = Path.GetExtension(originalName).ToLower().Replace(".", ""),                        Size = new FileInfo(file.LocalFileName).Length                    };                    modelList.Add(fileDto);                }                if (useCloud)                    await fileService.SendCloud(modelList,localPath);                await fileService.Add(modelList, IdentityClaimsValues.UserID<Guid>());                return Ok(Messages.Ok);            }            catch (Exception exMessage)            {                return Content(HttpStatusCode.InternalServerError, exMessage);            }        }    [   Route("Download"), HttpGet]        public async Task<IHttpActionResult> Download(Guid id)        {            /// Get file information my database            var model = await fileService.GetByID(id);            if (model == null)                return BadRequest();            /// `localPath` is get from Web.Config.            string localPath = HostingEnvironment.MapPath(ConfigurationManager.AppSettings["fileServiceLocalPath"]);            string root = localPath + "\\" + model.StorageName;            byte[] fileData = File.ReadAllBytes(root);            var stream = new MemoryStream(fileData, 0, fileData.Length);            var response = new HttpResponseMessage(HttpStatusCode.OK)            {                Content = new ByteArrayContent(stream.ToArray())            };            response.Content.Headers.ContentDisposition =                new ContentDispositionHeaderValue("attachment")                {                    FileName = model.OriginalName + "." + model.Extension,                    Size=model.Size                };            response.Content.Headers.ContentType =                new MediaTypeHeaderValue("application/octet-stream");            IHttpActionResult result = ResponseMessage(response);            return result;        }        [Route("ImageReview"), HttpGet]        public async Task<IHttpActionResult> ImageReview(Guid id)        {            /// Get file information my database            var model = await fileService.GetByID(id);            if (model == null)                return BadRequest();            /// `localPath` is get from Web.Config.            string localPath = HostingEnvironment.MapPath(ConfigurationManager.AppSettings["fileServiceLocalPath"]);            string root = localPath + "\\" + model.StorageName;            byte[] fileData = File.ReadAllBytes(root);            var stream = new MemoryStream(fileData, 0, fileData.Length);            var response = new HttpResponseMessage(HttpStatusCode.OK)            {                Content = new StreamContent(stream)            };            response.Content.Headers.ContentType =                new MediaTypeHeaderValue("image/"+ model.Extension);            IHttpActionResult result = ResponseMessage(response);            return result;        }    }

File Service

public interface IFileService    {        Task SendCloud(IList<FileDto> modelList, string localPath);    }       public class FileService : IFileService    {        public Task SendCloud(IList<FileDto> modelList,string localPath)        {            /// `ftpUserName`, `ftpPassword` and `storagePath` is get from Web.Config.            string ftpUserName = ConfigurationManager.AppSettings["ftpUserName"];            string ftpPassword = ConfigurationManager.AppSettings["ftpPassword"];            string storagePath = ConfigurationManager.AppSettings["fileServiceStoragePath"];            /// Uploaded files are sent to the cloud server.            foreach (var model in modelList)            {                FtpWebRequest req = (FtpWebRequest)WebRequest.Create(storagePath + model.StorageName);                req.UseBinary = true;                req.Method = WebRequestMethods.Ftp.UploadFile;                req.Credentials = new NetworkCredential(ftpUserName, ftpPassword);                byte[] fileData = File.ReadAllBytes(localPath + "\\" + model.StorageName);                req.ContentLength = fileData.Length;                Stream reqStream = req.GetRequestStream();                reqStream.Write(fileData, 0, fileData.Length);                reqStream.Close();            }            return Task.CompletedTask;        }    }

It's image for build.

I think your HttpClient with MultipartFormDataContent approach should work

just need to look out for input names, please try the following

HttpClient httpClient = new HttpClient();MultipartFormDataContent form = new MultipartFormDataContent();string filename = @"E:\Uploads\demo.csv"    , filename2 = @"E:\Uploads\demo2.csv"    , url = "http://demo.schooling.net/school/attendance"    , token = "fe60313b0edfdfaf757f9744815454545"    ;byte[] bytes = System.IO.File.ReadAllBytes(filename);// Keep `token` here, no quote escapingform.Add(new StringContent(token), "token");// Keep `Files[]` hereform.Add(new ByteArrayContent(bytes), "Files[]", Path.GetFileName(filename));// To add 2nd file, keep the input name as `Files[]`bytes = System.IO.File.ReadAllBytes(filename2);form.Add(new ByteArrayContent(bytes), "Files[]", Path.GetFileName(filename2));        var result = httpClient.PostAsync(url, form).Result;