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i need to create a csv file with UTF-8-BOM encoding, i am using .NET (C#)

public async Task<IActionResult> DownloadCSVResults([FromBody] ProfilesSearchOptions searchOptions)
{
var report = await profileManager.GetRep(searchOptions);
if (report == null)
{
return NotFound();
}
var result = Encoding.UTF8.GetPreamble().Concat(report.Body).ToArray();
return File(result, "text/csv", $"UserProfiles.{DateTime.Now:yyyy.MM.dd.HH.mm.ss}.csv");
}
public async Task<Report> GetRep(ProfilesSearchOptions searchOptions)
{
if (searchOptions == null)
{
return null;
}
var searchResult = await SearchProfiles(tenantDomain, false, searchOptions);
if (searchResult == null)
{
return null;
}
var report = GenerateReportRecord("Trainee");
var fileAsBytes = CsvService.GetCSVAsBytesWithHeaders(searchResult.UsersProfiles.Select(m => new UserProfileViewModel
{
Id = m.Id,
FirstNameAr = m.FirstNameAr,
FatherNameAr = m.FatherNameAr,
FamilyNameAr = m.FamilyNameAr,
FullNameAr = m.FullNameAr,
Email = m.Tenants?.Select(t => t.Email).Aggregate((t1, t2) => t1 + ", " + t2),
Deleted = m.Deleted.HasValue && m.Deleted.Value ? "Yes" : "No",
}));
report.Body = fileAsBytes;
report.Status = ReportStatus.Success;
return report;
}
public static byte[] GetCSVAsBytesWithHeaders<T>(IEnumerable<T> data)
{
using (var memory = new MemoryStream())
using (var writer = new StreamWriter(memory, new UTF8Encoding(true)))
using (var csvWriter = new CsvWriter(writer))
{
csvWriter.Configuration.RegisterClassMap<AutoClassMapWithApplyDisplayNameAttribute<T>>();
csvWriter.WriteRecords<T>(data);
writer.Flush();
var result = memory.ToArray();
return result;
}
}
private Report GenerateReportRecord(string reportTitle, string reportName)
{
return new Report
{
Id = Guid.NewGuid().ToString(),
ReportTitle = $"{reportTitle}.{DateTime.Now:yyyy.MM.dd.HH.mm.ss}",
Status = ReportStatus.InProgress
};
}
these are the three main functions that I am using the CSV file is created but with UTF-8 Encoding but as I mentioned, I needed it to be UTF-8-BOM...any help? and thanks in advance...
the problem is in my csv file some charater are displaying like that => " الاسم الاول "

Cannot access disposed object application connecting to WebAPI

I have content of video and object being created an pass into a http client web api. When ever I pass the image to the client it works find it gets to the post method, but when it comes to the video the client has trouble posting the video. I checked the video size length to make sure it meets the content length and it well under the specific ranges. The error that I receive is that the object has been disposed. If you look at the code the object is never disposed.
Here's the code on the app
public async Task<bool> AddToQueueAsync(Incident i, ContentPage page, MediaFile file)
{
HttpResponseMessage result = null;
Uri webserviceURL = i.IncidentType == IncidentType.Trooper ? trooperURL : gspURL;
var fileStream = File.Open(file.Path, FileMode.Open);
try
{
using (var client = new HttpClient())
{
using (fileStream)
{
using (var stream = new StreamContent(fileStream))
{
using (var content = new MultipartFormDataContent("----MyBoundary"))
{
if(i.MediaType == "Video")
{
content.Add(stream,"file", Guid.NewGuid().ToString() + ".mp4");
}
else
{
content.Add(stream, "file", Guid.NewGuid().ToString() + ".png");
}
content.Add(new StringContent(JsonConvert.SerializeObject(i)), "metadata");
result = await client.PostAsync(webserviceURL, content);
}
}
}
}
Here is the code on the web api:
[HttpPost]
public IHttpActionResult StarGSPDATA() {
try {
if(!Request.Content.IsMimeMultipartContent()) {
Request.CreateResponse(HttpStatusCode.UnsupportedMediaType);
}
starGSPDATAinfo suspicousInfo;
string homeDir = AppDomain.CurrentDomain.BaseDirectory;
string dir = $"{homeDir}/uploads/";
Directory.CreateDirectory(dir);
var file = HttpContext.Current.Request.Files.Count > 0 ?
HttpContext.Current.Request.Files[0] : null;
if(HttpContext.Current.Request.Form.Count > 0) {
suspicousInfo = MetaDataFromRequest(HttpContext.Current.Request.Form);
} else {
suspicousInfo = new starGSPDATAinfo();
}
if(file != null && file.ContentLength > 0) {
var fileName = Path.GetFileName(file.FileName);
var path = Path.Combine(dir, fileName);
suspicousInfo.MediaFilePath = fileName;
try {
file.SaveAs(path);
} catch(Exception e) {
Console.WriteLine($"not saving: {e.ToString()}");
}
} else {
throw new HttpResponseException(
new HttpResponseMessage(
HttpStatusCode.NoContent));
}
CleanData(suspicousInfo);
db.starGSPDATAinfoes.Add(suspicousInfo);
db.SaveChanges();
return Created("http://localhost:50641/api/StarGSPDATA/", JsonConvert.SerializeObject(suspicousInfo));
} catch(Exception e) {
return InternalServerError(e);
}
}
It works for an image but not for a video Please help thank you!
Here is a picture of the error

Issue with System.Threading.Tasks.Task.Factory.StartNew() in UWP?

I am working on Windows 10 UWP app and my requirement is to upload 5 images on the server with unique value. So, I have used System.Threading.Tasks.Task.Factory.StartNew().Now, when I checked while debugging, I found that randomly sometimes for 2 images, it sends same unique key. Can someone suggest is it better to use System.Threading.Tasks.Task.Factory.StartNew()?
All the images are sent using a web service. My sample code for this is following
WebServiceUtility serviceUtility = new WebServiceUtility();
List<System.Threading.Tasks.Task> tasks = new List<System.Threading.Tasks.Task>();
var cancelSource = new CancellationTokenSource();
cancellationToken = cancelSource.Token;
System.Threading.Tasks.Task currentTask = null;
List<System.Threading.Tasks.Task> uploadTasks = new List<System.Threading.Tasks.Task>();
List<string> uploadedImageIdList = new List<string>();
foreach (var image in _imageCollection)
{
if (!cancellationToken.IsCancellationRequested)
{
currentTask = await System.Threading.Tasks.Task.Factory.StartNew(async () =>
{
string imageName = string.Empty;
string imagePath = string.Empty;
if (image.IsEvidenceImage)
{
imageName = image.EvidencePath.Split('\\')[1];
imagePath = image.EvidencePath;
}
else
{
imageName = image.EvidencePath.Split('#')[1].Split('\\')[1];
imagePath = image.EvidencePath.Split('#')[1];
}
byte[] _imageAsByteArray = await GetEvidenceFromIsoStore(imagePath);
if (null != _imageAsByteArray && _imageAsByteArray.Length > 0)
{
IRestResponse response = await serviceUtility.UploadImage
(_imageAsByteArray, imageName,
new RequestDataGenerator().generateRequestDataForMediaUpload(
(null != _imageItem.I_IS_PRIMARY && "1".Equals(_imageItem.I_IS_PRIMARY) ? "1" : "0"),
evidenceName
));
if (response != null && response.RawBytes.Length > 0)
{
var successMessage = MCSExtensions.CheckWebserviceResponseCode(response.StatusCode);
if (successMessage.Equals(Constants.STATUS_CODE_SUCCESS))
{
byte[] decryptedevidenceresponse = WebserviceED.finaldecryptedresponse(response.RawBytes);
string responseString = Encoding.UTF8.GetString(decryptedevidenceresponse, 0, decryptedevidenceresponse.Length);
JObject reponseObject = JObject.Parse(responseString);
//Debug.WriteLine("Evidence Upload Response : " + Environment.NewLine);
uploadedimageIdList.Add(reponseObject["P_RET_ID"].ToString());
try
{
if (image.IsEvidenceImage)
{
if (await FileExists(image.EvidencePath))
{
StorageFile file = await localFolder.GetFileAsync(image.EvidencePath);
await file.DeleteAsync();
}
}
else
{
string[] evidenceMedia = image.EvidencePath.Split('#');
foreach (string evidenceItem in evidenceMedia)
{
if (await FileExists(evidenceItem))
{
StorageFile file = await localFolder.GetFileAsync(evidenceItem);
await file.DeleteAsync();
}
}
}
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message);
}
}
else
{
UserMessageUtil.ShowMessage(successMessage);
}
}
}
}, cancellationToken);
uploadTasks.Add(currentTask);
}
}
await System.Threading.Tasks.Task.WhenAll(uploadTasks.ToArray());

Just make it a separate method:
...
foreach (var image in _imageCollection)
{
if (!cancellationToken.IsCancellationRequested)
{
currentTask = UploadAsync(...);
uploadTasks.Add(currentTask);
}
}
await Task.WhenAll(uploadTasks);
async Task UploadAsync(...)
{
string imageName = string.Empty;
string imagePath = string.Empty;
...
}
Or, a bit more simply at the call site:
...
var uploadTasks = _imageCollection.Select(x => UploadAsync(...));
await Task.WhenAll(uploadTasks);

Upload to Dropbox not working .NET SDK

I have the following function that uploads files to Drobox and returns shared links to these files.
private async Task<string> Upload(DropboxClient dbx, string localPath, string remotePath)
{
const int ChunkSize = 4096 * 1024;
using (var fileStream = File.Open(localPath, FileMode.Open))
{
if (fileStream.Length <= ChunkSize)
{
WriteMode mode = new WriteMode();
FileMetadata fileMetadata = await dbx.Files.UploadAsync(remotePath, body: fileStream, mode: mode.AsAdd, autorename: true);
//set the expiry date
var existingDoc = await dbx.Files.GetMetadataAsync(remotePath);
if (existingDoc.IsFile)
{
var sharedLink = dbx.Sharing.ListSharedLinksAsync(remotePath);
var settings = new ListSharedLinksArg(remotePath);
ListSharedLinksResult listSharedLinksResult = await dbx.Sharing.ListSharedLinksAsync(remotePath);
if (listSharedLinksResult.Links.Count > 0)
{
return listSharedLinksResult.Links[0].Url;
}
else
{
var settings2 = new SharedLinkSettings(expires: DateTime.Today.AddDays(7));
SharedLinkMetadata sharedLinkMetadata = await dbx.Sharing.CreateSharedLinkWithSettingsAsync(remotePath, settings2);
return sharedLinkMetadata.Url;
}
}
else
{
var settings = new SharedLinkSettings(expires: DateTime.Today.AddDays(7));
SharedLinkMetadata sharedLinkMetadata = await dbx.Sharing.CreateSharedLinkWithSettingsAsync(fileMetadata.PathLower, settings);
return sharedLinkMetadata.Url;
}
}
else
{
await this.ChunkUpload(dbx, remotePath, fileStream, ChunkSize);
}
return "error";
}
}
But it's not working properly, when it gets to the ListSharedLinksAsync function, it stops working witout throwing any error.
I notices that the files that I try to upload are not accessible after it crashes, I get a "used by another proccess error"...
What am I doing wrong?

It looks like you are missing an await on this row, thus causing a deadlock?
var sharedLink = dbx.Sharing.ListSharedLinksAsync(remotePath);
Should be
var sharedLink = await dbx.Sharing.ListSharedLinksAsync(remotePath);

Get a black/no image with asp.net web api

I'am posting an image from a console application to a asp.net web api. I'am getting a file in the folder but the image is black (no image). Do I have something wrong in my code?
public class UploadController : ApiController
{
[System.Web.Mvc.HttpPost]
public string Upload()
{
var request = HttpContext.Current.Request;
var filePath = Path.Combine(HttpContext.Current.Server.MapPath("~/Uploads/"), request.Headers["filename"]);
try
{
using (var fs = new System.IO.FileStream(filePath, System.IO.FileMode.Create))
{
request.InputStream.CopyTo(fs);
}
}
catch (Exception e)
{
return e.Message;
}
return "uploaded";
}
}
Edit
My console app
http://pastebin.com/VsnDMYpb

try this. This works for me. I used this for multiple file upload
var httpRequest = HttpContext.Current.Request;
foreach (string file in httpRequest.Files)
{
var postedFile = httpRequest.Files[file];
var filePath = HttpContext.Current.Server.MapPath("~/Uploads/" + postedFile.FileName);
postedFile.SaveAs(filePath);
}

Use Request.Content.ReadAsMultipartAsync
public Task<IQueryable<HDFile>> Post()
{
try
{
var uploadFolderPath = HostingEnvironment.MapPath("~/App_Data/" + UploadFolder);
log.Debug(uploadFolderPath);
if (Request.Content.IsMimeMultipartContent())
{
var streamProvider = new WithExtensionMultipartFormDataStreamProvider(uploadFolderPath);
var task = Request.Content.ReadAsMultipartAsync(streamProvider).ContinueWith<IQueryable<HDFile>>(t =>
{
if (t.IsFaulted || t.IsCanceled)
{
throw new HttpResponseException(HttpStatusCode.InternalServerError);
}
var fileInfo = streamProvider.FileData.Select(i =>
{
var info = new FileInfo(i.LocalFileName);
return new HDFile(info.Name, Request.RequestUri.AbsoluteUri + "?filename=" + info.Name, (info.Length / 1024).ToString());
});
return fileInfo.AsQueryable();
});
return task;
}
else
{
throw new HttpResponseException(Request.CreateResponse(HttpStatusCode.NotAcceptable, "This request is not properly formatted"));
}
}
catch (Exception ex)
{
log.Error(ex);
throw new HttpResponseException(Request.CreateResponse(HttpStatusCode.BadRequest, ex.Message));
}
}
The code I get from this post