sftp upload download file, part of the code taken from the network, you need to add DiffieHellman.dll, Org.Mentalis.Security.dll, Tamir.SharpSSH.dll three DLL references

Using system;using system.collections;using system.collections.generic;using system.io;using Tamir.SharpSsh.java.io ; using Tamir.sharpssh.jsch;namespace EB.        mall.core.utils{public class Sftphelper {private Session m_session;        Private Channel M_channel;        Private Channelsftp m_sftp;            HOST:SFTP Address User: Username pwd: Password public sftphelper (string host, String user, string pwd) { String[] arr = host.            Split (': ');            string ip = arr[0];            int port = 22; if (arr.            Length > 1) port = Int32.Parse (arr[1]);            Jsch Jsch = new Jsch ();            M_session = jsch.getsession (user, IP, port);            Myuserinfo UI = new Myuserinfo ();            Ui.setpassword (PWD);        M_session.setuserinfo (UI);        }//SFTP connection state public bool Connected {get {return m_session.isconnected ()}} Connect SFTP public bool Connect () {try {               if (!                    Connected) {m_session.connect ();                    M_channel = M_session.openchannel ("sftp");                    M_channel.connect ();                M_sftp = (channelsftp) M_channel;            } return true;            } catch (Exception ex) {return false;                }}//disconnect sftp public void Disconnect () {if (Connected) {                M_channel.disconnect ();            M_session.disconnect ();             }}//sftp holds file public bool Put (string LocalPath, String remotepath) {try                {Tamir.SharpSsh.java.String src = new Tamir.SharpSsh.java.String (LocalPath);                Tamir.SharpSsh.java.String DST = new Tamir.SharpSsh.java.String (RemotePath);                M_sftp.put (SRC, DST);            return true; } CAtch {return false; }}//sftp Store file public bool Put (byte[] filecontent, string remotepath) {T                ry {Stream memstream = new MemoryStream (filecontent);                Tamir.SharpSsh.java.String DST = new Tamir.SharpSsh.java.String (RemotePath);                Putstream (Memstream, RemotePath);            return true;            } catch (Exception ex) {return false;            }} public bool Putstream (System.IO.Stream LocalFile, string remotepath) {try                {Tamir.SharpSsh.java.String DST = new Tamir.SharpSsh.java.String (RemotePath);                M_sftp.put (New Tamir.Streams.InputStreamWrapper (LocalFile), DST, 1);                Localfile.dispose ();            return true;            } catch (Exception ex) {throw ex;    }        }    public bool MkDir (string path) {try {m_sftp.mkdir (path);            return true;            } catch (Exception ex) {throw ex;             }}//sftp get file public bool Get (string RemotePath, String localPath) {try                {Tamir.SharpSsh.java.String src = new Tamir.SharpSsh.java.String (RemotePath);                Tamir.SharpSsh.java.String DST = new Tamir.SharpSsh.java.String (LocalPath);                M_sftp.get (SRC, DST);            return true;            } catch (Exception ex) {return false;                }}//delete sftp file public bool Delete (string remotefile) {try {                M_SFTP.RM (RemoteFile);            return true;            } catch {return false; }}//Get SFTP textItem List Public ArrayList getfilelist (string remotepath, String fileType) {try {                Tamir.SharpSsh.java.util.Vector VVV = M_sftp.ls (RemotePath);                ArrayList objlist = new ArrayList (); foreach (Tamir.SharpSsh.jsch.ChannelSftp.LsEntry qqq in VVV) {string sss = Qqq.getfilen                    Ame (); if (SSS. Length > (filetype.length + 1) && FileType = sss. Substring (SSS.                    Length-filetype.length)) {Objlist.add (SSS);}                else {continue;}            } return objlist;            } catch {return null;            }}//Login authentication Information public class Myuserinfo:userinfo {String passwd;            Public String GetPassword () {return passwd;}            public void SetPassword (String passwd) {this.passwd = passwd;} Public STring Getpassphrase () {return null;}            public bool Promptpassphrase (String message) {return true;}            public bool Promptpassword (String message) {return true;}            public bool Promptyesno (String message) {return true;} public void ShowMessage (String message) {}}}}

sftp upload download file, part of the code taken from the network, you need to add DiffieHellman.dll, Org.Mentalis.Security.dll, Tamir.SharpSSH.dll three DLL references