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   源码介绍

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Renci.SshNet;
using System.IO;
using System.Threading;

namespace SFTP_VS
{
    public class SFtpClient : IFtpClient
    {
        SftpClient sftp = null;

        /// <summary>
        /// 构造函数
        /// </summary>
        /// <param name="host">sftp服务器名或IP</param>
        /// <param name="port">端口，默认22</param>
        /// <param name="user"></param>
        /// <param name="privateKey"></param>
        /// <param name="passPhrase"></param>
        public SFtpClient(string host, int? port, string user, string privateKey, string passPhrase)
        {
            PrivateKeyFile keyFile = null;

            if (string.IsNullOrEmpty(passPhrase))
            {
                keyFile = new PrivateKeyFile(privateKey);
            }
            else
            {
                keyFile = new PrivateKeyFile(privateKey, passPhrase);
            }

            if (port.HasValue)
            {
                sftp = new SftpClient(host, port.Value, user, keyFile);
            }
            else
            {
                sftp = new SftpClient(host, user, keyFile);
            }


            if (sftp != null)
            {
                sftp.ConnectionInfo.RetryAttempts = 5;
                sftp.ConnectionInfo.Timeout = new TimeSpan(0, 3, 0);
            }
        }

        public bool Connect()
        {
            if (sftp == null)
            {
                return false;
            }

            if (sftp.IsConnected)
            {
                return true;
            }

            try
            {
                sftp.Connect();
                return true;
            }
            catch (Exception ex)
            {
                string server = string.Format("{0}:{1}", sftp.ConnectionInfo.Username, sftp.ConnectionInfo.Host);
                // 我用的是nLog来记录错误日志。
                // logger.Error("[{0}] SFTP连接发生错误。", server, ex);
                return false;
            }
        }

        public void DisConnect()
        {
            if (sftp == null)
            {
                return;
            }
            if (!sftp.IsConnected)
            {
                return;
            }

            try
            {
                sftp.Disconnect();
                sftp.Dispose();
                sftp = null;
            }
            catch (Exception ex)
            {
                //logger.Error("SFTP断开连接发生错误。", ex);
            }
        }

        /// <summary>
        /// 取得文件列表
        /// </summary>
        /// <param name="path">路径</param>
        /// <returns></returns>
        public List<string> ListFiles(string path)
        {

            if (!Connect())
            {
                return null;
            }

            List<string> files = new List<string>();
            try
            {
                sftp.ChangeDirectory("/");
                sftp.ListDirectory(path).ToList().ForEach(f =>
                {

                    files.Add(f.FullName);
                });

                return files;
            }
            catch (Exception ex)
            {
                // logger.Error("[{0}]　取得文件列表发生错误。", Path, ex);
                return null;
            }
        }

        /// <summary>
        /// 下载文件 
        /// </summary>
        /// <param name="remoteFileName">包含全路径的服务器端文件名</param>
        /// <param name="localFileName">本地保存的文件名</param>
        /// <returns></returns>
        public bool Download(string remoteFileName, string localFileName)
        {
            if (!Connect())
            {
                return false;
            }

            try
            {
                sftp.ChangeDirectory("/");
                FileStream fs = File.OpenWrite(localFileName);
                sftp.DownloadFile(remoteFileName, fs);
                fs.Close();
                return true;
            }
            catch (Exception ex)
            {
                //logger.Error("[{0}]　文件下载发生错误。", remoteFileName, ex);
                return false;
            }
        }

        /// <summary>
        /// 上传文件
        /// </summary>
        /// <param name="localFileName">待上传的文件</param>
        /// <param name="remoteFileName">服务器端文件名</param>
        /// <returns></returns>
        public bool Upload(string localFileName, string remoteFileName)
        {
            if (!Connect())
            {
                return false;
            }

            try
            {
                sftp.ChangeDirectory("/");

                FileStream fs = File.OpenRead(localFileName);
                sftp.UploadFile(fs, remoteFileName, true);
                fs.Close();
                Thread.Sleep(1000);
                return true;
            }
            catch (Exception ex)
            {
                //logger.Error("[{0}]　文件上传发生错误。", localFileName, ex);
                return false;
            }
        }

        /// <summary>
        /// 文件改名
        /// </summary>
        /// <param name="localFileName">包含全路径的源文件名</param>
        /// <param name="remoteFileName">包含全路径的新文件名</param>
        /// <returns></returns>
        public bool Rename(string orgFileName, string newFileName)
        {
            if (!Connect())
            {
                return false;
            }

            try
            {
                sftp.ChangeDirectory("/");

                sftp.RenameFile(orgFileName, newFileName);
                return true;
            }
            catch (Exception ex)
            {
                //logger.Error("[{0}]　文件改名发生错误。", localFileName, ex);
                return false;
            }
        }


        /// <summary>
        /// 删除文件
        /// </summary>
        /// <param name="orgFileName"></param>
        /// <param name="newFileName"></param>
        /// <returns></returns>
        public bool Delete(string fileName)
        {
            if (!Connect())
            {
                return false;
            }

            try
            {
                sftp.ChangeDirectory("/");

                sftp.DeleteFile(fileName);
                return true;
            }
            catch (Exception ex)
            {
                //logger.Error("[{0}]　文件删除发生错误。", localFileName, ex);
                return false;
            }
        }
    }
}