How to transfer multiple files from FTP server to local directory using C#?

Very Great and simple library FluentFTP

Check it out;

My config file:

<?xml version="1.0" encoding="utf-8" ?> <configuration> <startup> <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6.1" /> </startup> <appSettings> <add key="FtpHost" value="127.0.0.1"/> <add key="FtpUser" value="username"/> <add key="FtpPassword" value="password123"/> <add key="FtpDirectory" value="/INTERESTING FILES/DATA"/> <add key="FileExtension" value=".txt"/> <add key="DownloadTo" value="C:\Downloads"/> <add key="DeleteFilesAfterDownload" value="false"/> </appSettings> </configuration>

And a little FTP Library:

namespace FTPDownloadAdapter {
    class Program
    {
        private static readonly string FtpHost = ConfigurationManager.AppSettings["FtpHost"];
        private static readonly string FtpUser = ConfigurationManager.AppSettings["FtpUser"];
        private static readonly string FtpPassword = ConfigurationManager.AppSettings["FtpPassword"];
        private static readonly string FtpDirectory = ConfigurationManager.AppSettings["FtpDirectory"];
        private static readonly string FileExtension = ConfigurationManager.AppSettings["FileExtension"];
        private static readonly string DownloadTo = ConfigurationManager.AppSettings["DownloadTo"];
        private static readonly string DeleteFilesAfterDownload = ConfigurationManager.AppSettings["DeleteFilesAfterDownload"];

        static void Main(string[] args)
        {


            try{


                DownloadFiles();


            }
            catch (Exception er){
                Console.WriteLine(er.ToString());
            }

        }

        private static void DownloadFiles(){

            // create an FTP client
            var client = new FtpClient(FtpHost) { Credentials = new NetworkCredential(FtpUser, FtpPassword) };

            // if you don't specify login credentials, we use the "anonymous" user account


            // begin connecting to the server
            client.Connect();


            Console.WriteLine($"Retrieving files with extension [{FileExtension}] from directory [{FtpDirectory}]");



            foreach (FtpListItem item in client.GetListing(FtpDirectory)){

                // if this is a file
                if (item.Type == FtpFileSystemObjectType.File && (Path.GetExtension(item.FullName) == FileExtension)){

                    // get the file size
                    long size = client.GetFileSize(item.FullName);

                    // get modified date/time of the file or folder
                    DateTime time = client.GetModifiedTime(item.FullName);

                    // calculate a hash for the file on the server side (default algorithm)
                    FtpHash hash = client.GetHash(item.FullName);

                    // download the file 
                    var fileName = Path.GetFileName(item.FullName);
                    var saveFilePath = Path.Combine(DownloadTo, fileName ?? throw new InvalidOperationException("File Appears to not have a name"));

                    Console.WriteLine($"Downloading file: {fileName}");

                    client.DownloadFile(localPath: saveFilePath, remotePath: item.FullName);

                    if (DeleteFilesAfterDownload == "true")
                    {
                        Console.WriteLine($"DeleteFilesAfterDownload is true, Deleting file from FTP : {item.FullName}");

                        client.DeleteFile(item.FullName);

                        Console.WriteLine("File deletion success");
                    }
                    else
                    {

                        Console.WriteLine($"DeleteFilesAfterDownload not true, skip deleting : {item.FullName}");

                    }

                }
            }
        }
    }
}