C# FTP下载 采用Ssh.Net方式

不要再用FTPClient了

nuget下载Ssh.Net

然后代码如下：

/// <summary>/// SFTP操作类/// </summary>public class SFTPHelper{#region 字段或属性private SftpClient sftp;/// <summary>/// SFTP连接状态/// </summary>public bool Connected { get { return sftp.IsConnected; } }#endregion#region 构造/// <summary>/// 构造/// </summary>/// <param name="ip">IP</param>/// <param name="port">端口</param>/// <param name="user">用户名</param>/// <param name="pwd">密码</param>public SFTPHelper(string ip, string port, string user, string pwd){sftp = new SftpClient(ip, Int32.Parse(port), user, pwd);}#endregion#region 连接SFTP/// <summary>/// 连接SFTP/// </summary>/// <returns>true成功</returns>public bool Connect(){try{if (!Connected){sftp.Connect();}return true;}catch (Exception ex){// TxtLog.WriteTxt(CommonMethod.GetProgramName(), string.Format("连接SFTP失败，原因：{0}", ex.Message));throw new Exception(string.Format("连接SFTP失败，原因：{0}", ex.Message));}}#endregion#region 断开SFTP/// <summary>/// 断开SFTP/// </summary> public void Disconnect(){try{if (sftp != null && Connected){sftp.Disconnect();}}catch (Exception ex){// TxtLog.WriteTxt(CommonMethod.GetProgramName(), string.Format("断开SFTP失败，原因：{0}", ex.Message));throw new Exception(string.Format("断开SFTP失败，原因：{0}", ex.Message));}}#endregion#region SFTP上传文件/// <summary>/// SFTP上传文件/// </summary>/// <param name="localPath">本地路径</param>/// <param name="remotePath">远程路径</param>public void Put(string localPath, string remotePath){try{using (var file = File.OpenRead(localPath)){Connect();sftp.UploadFile(file, remotePath);Disconnect();}}catch (Exception ex){// TxtLog.WriteTxt(CommonMethod.GetProgramName(), string.Format("SFTP文件上传失败，原因：{0}", ex.Message));throw new Exception(string.Format("SFTP文件上传失败，原因：{0}", ex.Message));}}#endregion#region SFTP获取文件/// <summary>/// SFTP获取文件/// </summary>/// <param name="remotePath">远程路径</param>/// <param name="localPath">本地路径</param>public void Get(string remotePath, string localPath){try{Connect();var byt = sftp.ReadAllBytes(remotePath);Disconnect();File.WriteAllBytes(localPath, byt);}catch (Exception ex){// TxtLog.WriteTxt(CommonMethod.GetProgramName(), string.Format("SFTP文件获取失败，原因：{0}", ex.Message));throw new Exception(string.Format("SFTP文件获取失败，原因：{0}", ex.Message));}}#endregion#region 删除SFTP文件/// <summary>/// 删除SFTP文件 /// </summary>/// <param name="remoteFile">远程路径</param>public void Delete(string remoteFile){try{Connect();sftp.Delete(remoteFile);Disconnect();}catch (Exception ex){// TxtLog.WriteTxt(CommonMethod.GetProgramName(), string.Format("SFTP文件删除失败，原因：{0}", ex.Message));throw new Exception(string.Format("SFTP文件删除失败，原因：{0}", ex.Message));}}#endregion#region 获取SFTP文件列表/// <summary>/// 获取SFTP文件列表/// </summary>/// <param name="remotePath">远程目录</param>/// <param name="fileSuffix">文件后缀</param>/// <returns></returns>public ArrayList GetFileList(string remotePath, string fileSuffix){try{Connect();var files = sftp.ListDirectory(remotePath);Disconnect();var objList = new ArrayList();foreach (var file in files){string name = file.Name;if (name.Length > (fileSuffix.Length + 1) && fileSuffix == name.Substring(name.Length - fileSuffix.Length)){objList.Add(name);}}return objList;}catch (Exception ex){// TxtLog.WriteTxt(CommonMethod.GetProgramName(), string.Format("SFTP文件列表获取失败，原因：{0}", ex.Message));throw new Exception(string.Format("SFTP文件列表获取失败，原因：{0}", ex.Message));}}#endregion#region 移动SFTP文件/// <summary>/// 移动SFTP文件/// </summary>/// <param name="oldRemotePath">旧远程路径</param>/// <param name="newRemotePath">新远程路径</param>public void Move(string oldRemotePath, string newRemotePath){try{Connect();sftp.RenameFile(oldRemotePath, newRemotePath);Disconnect();}catch (Exception ex){// TxtLog.WriteTxt(CommonMethod.GetProgramName(), string.Format("SFTP文件移动失败，原因：{0}", ex.Message));throw new Exception(string.Format("SFTP文件移动失败，原因：{0}", ex.Message));}}#endregion}

调用：

   SFTPHelper sFTPHelper = new SFTPHelper("172.0.0.1", "21", "sftp", "bacd123");sFTPHelper.Get("/bak/10001.pdf", "D:\\10001.pdf");