Verify if file existes then moving file from sftp folder to another with C# (using Renci.SshNet.Sftp)

Question

I have this code in C# (script task SSIS)

    public void Main()
    {
        // TODO: Add your code here
        string Server = Dts.Variables["FTPServer"].Value.ToString();
        string User = Dts.Variables["FTPUser"].Value.ToString();
        string Password = Dts.Variables["FTPPassword"].Value.ToString();
        int port = (int) Dts.Variables["FTPPort"].Value;
        string remoteFolder = Dts.Variables["FTPRemoteFolder"].Value.ToString();
        string archiveFolder = remoteFolder + "/TEST_ARCHIVES/" ;
        moveFiles(Server, port, Password, User, remoteFolder, archiveFolder);

        Dts.TaskResult = (int)ScriptResults.Success;

    } 
    
    void moveFiles(string FTPServer,int port,string FTPPassword,string FTPUser,string oldPath,string newPath)
        {
            try
            {
                using (var client = new SftpClient(FTPServer, port, FTPUser, FTPPassword))
                {
                    client.Connect();
                    if (!client.IsConnected)
                    {
                        throw new Exception("Not Connected");
                    }
               List <SftpFile> files = (List<SftpFile>)client.ListDirectory(oldPath);
                foreach (var file in files)
                {
                    if(file.Name.StartsWith("EXP_"))
                    {
                        file.MoveTo(newPath + file.Name );
                    }
                 
                }
                    client.Disconnect();
                }
            }
            catch (Exception exception)
            {
                Console.WriteLine(exception);
                throw;
            }
        }

The above script is from a script task SSIS and it can move files having name starts with "EXP_" from oldPath (folder 1 in sftp server) to the newPath (folder 2 in sftp server). It works fine correctly when the file does not exists in folder 2. But when I try to move a file that exists already in the newPath (folder 2 in sftp server) it fails when running the SSIS package. What I need to implement:

• verify before if the file exists in folder 2
• move the file and if it exist already overwrite the old one with the new one

NB: I'm using in references: using Renci.SshNet.Sftp; so the function File.Exists() not appear, it's a specific situation with functions that uses Renci.SshNet.Sftp

Answer 1

MoveTo has an override that allows you to specify if it should overwrite the destination file, if it exists. Simply add a "true" to your file.MoveTo() call as a second parameter like this and give it a try:

foreach (var file in files)
{
    if(file.Name.StartsWith("EXP_"))
    {
        file.MoveTo(newPath + file.Name, true);
    }
}

See the Microsoft Documentation for this method for more information.