Sftp upload from memory stream asp.net - asp.net

Question

I am trying to upload a csv file that is created from a query and upload via sftp.
I am trying to avoid creating a file and then reading the file to upload it by keeping the data in memory.
Thanks in advance
var customerAddresses = addresses.Select(p => new { p.Customer.Name, p.Customer.AlternateName, p.City, p.StateProvince });
using (var memoryStream = new MemoryStream())
{
//if you pass a file path to streamWriter it creates a csv with the correct format and data
using (var streamWriter = new StreamWriter())
{
using (var csv = new CsvWriter(streamWriter))
{
csv.WriteRecords(customerAddresses);
var fileName = DateTime.UtcNow.ToString(dateFromat) + destinationFileName;
var privateKey = new PrivateKeyFile(sshKeyLocation);
var connectionInfo = new PrivateKeyConnectionInfo(address,
username,
new PrivateKeyFile(sshKeyLocation)
);
memoryStream.Flush();
using (var client = new SftpClient(connectionInfo))
{
client.Connect();
client.ChangeDirectory(serverDirectory);
client.UploadFile(memoryStream, fileName); //is always an empty file
}
}
}

Answer 1

Try adding setting memoryStream Position to beginning with Seek before calling UploadFile and calling streamWriter.Flush();, not memoryStream.Flush():
streamWriter.Flush();
memoryStream.Seek(0, SeekOrigin.Begin);
using (var client = new SftpClient(connectionInfo))
{
client.Connect();
client.ChangeDirectory(serverDirectory);
client.UploadFile(memoryStream, fileName);
}

Answer 2

I never figured out how to get it to work with MemoryStream and changed to to write a file and then read and upload that file.
public HttpResponseMessage Post([FromBody] CustomerIds[] CustomerIds)
{
try
{
if(CustomerIds.Length == 0)
{
throw new Exception("No customer ids passed in post body.");
}
else if (!File.Exists(sshKeyLocation))
{
throw new Exception("Missing ssh file.");
}
if(!Directory.Exists(localDirectory))
{
Directory.CreateDirectory(localDirectory);
}
var customerAddresses = _repository.GetPrimaryAddress(CustomerIds.Select(c => c.Id))
.Select(p => new
{
p.Customer.Name,
p.Customer.AlternateName,
p.City,
p.StateProvince
}
);
if (customerAddresses == null || !customerAddresses.Any())
{
throw new Exception("No customer addresses found for selected customers.");
}
var fileName = DateTime.UtcNow.ToString(dateFromat) + destinationFileName;
var localFilePath = Path.Combine(localDirectory, fileName);
CreateFile(customerAddresses, localFilePath);
UploadFile(localFilePath, fileName);
return new HttpResponseMessage(System.Net.HttpStatusCode.OK);
}
catch(Exception error)
{
logger.Error(error, error.Message);
throw error;
}
}
private void CreateFile(IEnumerable<object> customerAddresses, string filePath)
{
using (TextWriter streamWriter = new StreamWriter(filePath))
using (var csv = new CsvWriter(streamWriter))
{
csv.WriteRecords(customerAddresses);
}
}
private void UploadFile(string localFilePath, string destinationFileName)
{
var connectionInfo = new PrivateKeyConnectionInfo(address,
username,
new PrivateKeyFile(sshKeyLocation)
);
using (var fileStream = new FileStream(localFilePath, FileMode.Open))
using (var client = new SftpClient(connectionInfo))
{
client.Connect();
client.ChangeDirectory(serverDirectory);
client.UploadFile(fileStream, destinationFileName);
}
}
I've run out of time to continue trying to upload using the MemoryStream and will just have to use this solution. Disappointed I couldn't get it to work.