Move files dropped on an FTP to a local folder without deleting the FTP folders.

// Download files
TransferOptions TransferOptions = new TransferOptions();
TransferOptions.TransferMode = TransferMode.Binary;
TransferOptions.FileMask = "*.zip";
TransferOperationResult transferResult = session.GetFiles(
   "/*", @Dts.Variables["$Project::PROP_FilePath"].Value.ToString(), true, TransferOptions);

using System;
using System.Data;
using Microsoft.SqlServer.Dts.Runtime;
using Microsoft.SqlServer.Dts.Tasks.ScriptTask;
using System.Windows.Forms;
using WinSCP;
 
namespace ST_0211b76178e849199217ecc2d4ccaa07
{
    [SSISScriptTaskEntryPoint]
    public partial class ScriptMain : VSTARTScriptObjectModelBase
    {
        public void Main()
        {
            SessionOptions sessionOptions = new SessionOptions
            {
                Protocol = Protocol.Ftp,
                FtpSecure = FtpSecure.Explicit,
                HostName = Dts.Variables["$Project::PROP_FTP_HostName"].Value.ToString(),
                UserName = Dts.Variables["$Project::PROP_FTP_UserName"].Value.ToString(),
                Password = Dts.Variables["$Project::PROP_FTP_Password"].Value.ToString(),
                TlsHostCertificateFingerprint = Dts.Variables["$Project::PROP_FTP_Fingerprint"].Value.ToString()
            };
 
            try
            {
                using (Session session = new Session())
                {
                    // As WinSCP .NET assembly has to be stored in GAC to be used with SSIS,
                    // you need to set path to WinSCP.exe explicitly, if using non-default location.
                    session.ExecutablePath = @Dts.Variables["$Project::PROP_CheminWinSCP"].Value.ToString();
 
                    //session.QueryReceived += (sender, e) =>
                    //{
                    //    Console.WriteLine("Error: {0}", e);
                    //    e.Continue();
                    //};
 
                    // Connect
                    session.Open(sessionOptions);
 
                    // Download files
                    TransferOptions transferOptions = new TransferOptions();
                    transferOptions.TransferMode = TransferMode.Binary;
                    //transferOptions.FileMask = "*.zip";
                    TransferOperationResult transferResult =
                    session.GetFiles(
                        "/*", @Dts.Variables["$Project::PROP_CheminFichiers"].Value.ToString(), true, transferOptions);
 
                    // Throw on any error
                    transferResult.Check();
 
                    // Print results
                    bool fireAgain = false;
                    foreach (TransferEventArgs transfer in transferResult.Transfers)
                    {
                        Dts.Events.FireInformation(0, null,
                            string.Format("Upload of {0} succeeded", transfer.FileName),
                            null, 0, ref fireAgain);
                    }
                }
 
                Dts.TaskResult = (int)DTSExecResult.Success;
            }
            catch (Exception e)
            {
                Dts.Events.FireError(0, null,
                    string.Format("Error when using WinSCP to upload files: {0}", e),
                    null, 0);
 
                Dts.TaskResult = (int)DTSExecResult.Failure;
            }
        }
    }
}

using (Session session = new Session())
{
    // Connect
    session.Open(sessionOptions);
 
    // Enumerate files and directories to DOWNload
    IEnumerable<FileSystemInfo> fileInfos =
        new DirectoryInfo(remotePath).EnumerateFileSystemInfos(
            "*", SearchOption.AllDirectories);
 
    foreach (FileSystemInfo fileInfo in fileInfos)
    {
        string localFilePath =
            RemotePath.TranslateRemotePathToLocal(
                fileInfo.FullName, remotePath, localPath);
 
        if (fileInfo.Attributes.HasFlag(FileAttributes.Directory))
        {
            // Create remote subdirectory, if it does not exist yet
            if (!session.FileExists(localFilePath))
            {
                session.CreateDirectory(localFilePath);
            }
        }
        else
        {
            Console.WriteLine("Moving file {0}...", fileInfo.FullName);
            // DOWNload file and remove original
            session.GetFiles(fileInfo.FullName, localFilePath, true).Check();
        }
    }
}

$subfolders =
    $session.EnumerateRemoteFiles(
        $remotePath, $Null, [WinSCP.EnumerationOptions]::EnumerateDirectories)
foreach ($subfolder in $subfolders)
{
    $dest = (Join-Path $localPath ("COPY_" + $subfolder.Name) "*")
    $session.GetFiles($subfolder.FullName + "/*", $dest).Check()
}

foreach (RemoteFileInfo fileInfo in fileInfos)
{
     string destFileName = fileInfo.FullName.Insert(1, "COPY_");
     string localFilePath =
            RemotePath.TranslateRemotePathToLocal(
                  destFileName, remotePath, localPath);
...
}