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因为项目的需要，整理了一段C#操作sftp的方法。

依赖的第三方类库名称为：SharpSSH 1.1.1.13.

代码如下：

   1:  using System;

   2:  using System.Collections.Generic;

   3:  using System.Linq;

   4:  using System.Text;

   5:  using System.Collections.Specialized;

   6:  using System.Configuration;

   7:  using Tamir.SharpSsh;

   8:  using System.IO;

   9:  using Tamir.SharpSsh.jsch;

  10:   

  11:  namespace CET.Finance.SftpWinService.Common

  12:  {

  13:      /// <summary>

  14:      /// 访问Sftp服务器方法(凭证请在config文件中配置)

  15:      /// </summary>

  16:      public class SftpClient : IDisposable

  17:      {

  18:          #region Properties

  19:   

  20:          /// <summary>

  21:          /// 主机名或IP

  22:          /// </summary>

  23:          public string HostName { get; private set; }

  24:          /// <summary>

  25:          /// 用户名

  26:          /// </summary>

  27:          public string UserName { get; private set; }

  28:          /// <summary>

  29:          /// 密码

  30:          /// </summary>

  31:          public string Password { get; private set; }

  32:   

  33:          /// <summary>

  34:          /// 端口号(默认端口为22)

  35:          /// </summary>

  36:          public int Port { get; private set; }        

  37:   

  38:          #endregion

  39:   

  40:          private static readonly string defRemotePath = "/";//默认操作是都是从根目录开始。

  41:          private ChannelSftp m_sftp;

  42:          private Session m_session;

  43:          Channel m_channel;

  44:   

  45:          /// <summary>

  46:          /// 从配置文件中加载凭证信息

  47:          /// </summary>       

  48:          public SftpClient()

  49:          {

  50:              var config = ConfigurationManager.GetSection("SftpServer") as NameValueCollection;

  51:              this.HostName = config["host_name"];

  52:              this.UserName = config["user_name"];

  53:              this.Password = config["password"];

  54:              this.Port = Convert.ToInt32(config["port"] ?? "22");//默认端口为22    

  55:              this.ConnectSftp();

  56:          }

  57:   

  58:          #region Events

  59:   

  60:          /// <summary>

  61:          /// SFTP获取文件   

  62:          /// </summary>

  63:          /// <param name="remotePath"></param>

  64:          /// <param name="localPath"></param>

  65:          /// <returns></returns>

  66:   

  67:          public bool Get(string remotePath, string localPath)

  68:          {

  69:              try

  70:              {

  71:                  string fullRemotePath = defRemotePath + remotePath.TrimStart('/');

  72:                  Tamir.SharpSsh.java.String src = new Tamir.SharpSsh.java.String(fullRemotePath);

  73:                  Tamir.SharpSsh.java.String dst = new Tamir.SharpSsh.java.String(localPath);

  74:                  m_sftp.get(src, dst);

  75:                  return true;

  76:              }

  77:              catch

  78:              {

  79:                  return false;

  80:              }

  81:          }

  82:   

  83:          /// <summary>

  84:          ///SFTP存放文件   

  85:          /// </summary>

  86:          /// <param name="localPath"></param>

  87:          /// <param name="remotePath"></param>

  88:          /// <returns></returns>

  89:          public void Put(string localPath, string remotePath)

  90:          {

  91:              Tamir.SharpSsh.java.String src = new Tamir.SharpSsh.java.String(localPath);

  92:              string fullRemotePath = defRemotePath + remotePath.TrimStart('/');

  93:              Tamir.SharpSsh.java.String dst = new Tamir.SharpSsh.java.String(fullRemotePath);

  94:              m_sftp.put(src, dst);

  95:          }

  96:   

  97:   

  98:          /// <summary>

  99:          /// 删除SFTP文件 

 100:          /// </summary>

 101:          /// <param name="remoteFile"></param>

 102:          /// <returns></returns>

 103:   

 104:          public void Delete(string remoteFile)

 105:          {

 106:              string fullRemotePath = defRemotePath + remoteFile.TrimStart('/');

 107:              m_sftp.rm(fullRemotePath);

 108:          }

 109:          /// <summary>

 110:          /// 获取SFTP文件列表   

 111:          /// </summary>

 112:          /// <param name="remotePath"></param>

 113:          /// <param name="fileType">文件后缀名称(.txt)</param>

 114:          /// <returns></returns>

 115:          public List<string> GetFileList(string remotePath, string fileType)

 116:          {

 117:              List<string> objList = new List<string>();

 118:              string fullRemotePath = defRemotePath + remotePath.TrimStart('/');

 119:              if (DirExist(fullRemotePath))

 120:              {

 121:                  Tamir.SharpSsh.java.util.Vector vvv = m_sftp.ls(fullRemotePath);

 122:                  foreach (Tamir.SharpSsh.jsch.ChannelSftp.LsEntry qqq in vvv)

 123:                  {

 124:                      string sss = qqq.getFilename();

 125:                      if (fileType.Contains(Path.GetExtension(sss)))

 126:                      { 

 127:                          objList.Add(sss);

 128:                      }                  

 129:                  }

 130:              }

 131:              return objList;

 132:          }

 133:   

 134:          /// <summary>

 135:          /// 目录是否存在

 136:          /// </summary>

 137:          /// <param name="dirName">目录名称必须从根开始</param>

 138:          /// <returns></returns>

 139:          public bool DirExist(string dirName)

 140:          {

 141:              try

 142:              {

 143:                  m_sftp.ls(defRemotePath + dirName.TrimStart('/'));

 144:                  return true;

 145:              }

 146:              catch (Tamir.SharpSsh.jsch.SftpException)

 147:              {

 148:                  return false;//执行ls命令时出错，则目录不存在。

 149:              }

 150:          }

 151:   

 152:          /// <summary>

 153:          /// 创建目录

 154:          /// </summary>

 155:          /// <param name="dirName">目录名称必须从根开始</param>

 156:          /// <returns></returns>

 157:          public void Mkdir(string dirName)

 158:          {

 159:              Tamir.SharpSsh.java.util.Vector vvv = m_sftp.ls(defRemotePath);

 160:              foreach (Tamir.SharpSsh.jsch.ChannelSftp.LsEntry fileName in vvv)

 161:              {

 162:                  string name = fileName.getFilename();

 163:                  if (name == dirName)

 164:                  {

 165:                      throw new Exception("dir is exist");

 166:                  }

 167:              }

 168:              m_sftp.mkdir(defRemotePath + dirName.TrimStart('/'));

 169:          }

 170:   

 171:          /// <summary>

 172:          /// 连接SFTP   

 173:          /// </summary>

 174:          public void ConnectSftp()

 175:          {

 176:              JSch jsch = new JSch();   //利用java实现的通讯包  

 177:              m_session = jsch.getSession(this.UserName, this.HostName, this.Port);

 178:              m_session.setHost(this.HostName);

 179:              MyUserInfo ui = new MyUserInfo();

 180:              ui.setPassword(this.Password);

 181:              m_session.setUserInfo(ui);

 182:   

 183:              if (!m_session.isConnected())

 184:              {

 185:                  m_session.connect();

 186:                  m_channel = m_session.openChannel("sftp");

 187:                  m_channel.connect();

 188:                  m_sftp = (ChannelSftp)m_channel;

 189:              }

 190:          }

 191:   

 192:          /// <summary>

 193:          /// 断开SFTP    

 194:          /// </summary>

 195:          public void DisconnectSftp()

 196:          {

 197:              if (m_session.isConnected())

 198:              {

 199:                  m_channel.disconnect();

 200:                  m_session.disconnect();

 201:              }

 202:          }

 203:   

 204:          #endregion

 205:   

 206:          //登录验证信息            

 207:          private class MyUserInfo : UserInfo

 208:          {

 209:              String passwd;

 210:              public String getPassword() { return passwd; }

 211:              public void setPassword(String passwd) { this.passwd = passwd; }

 212:   

 213:              public String getPassphrase() { return null; }

 214:              public bool promptPassphrase(String message) { return true; }

 215:   

 216:              public bool promptPassword(String message) { return true; }

 217:              public bool promptYesNo(String message) { return true; }

 218:              public void showMessage(String message) { }

 219:          }

 220:   

 221:          public void Dispose()

 222:          {

 223:              this.DisconnectSftp();

 224:              this.m_channel = null;

 225:              this.m_session = null;

 226:              this.m_sftp = null;

 227:          }

 228:      }

 229:   

 230:  }

配置文件内容：

<?xml version="1.0" encoding="utf-8" ?>

<configuration>

  <configSections>

    <section name="SftpServer" type="System.Configuration.NameValueSectionHandler"/>

  </configSections>

  <SftpServer>

    <add key="host_name" value="127.0.0.1"/>

    <add key="user_name" value="test"/>

    <add key="password" value="123"/>

  </SftpServer>   

</configuration>