csharp: FTP Client Library using System.Net.FtpWebRequest

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using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Data; using System.Collections; using Microsoft.VisualBasic; using System.Net; using System.IO; using System.Text.RegularExpressions; using System.Windows.Forms; //https://www.codeproject.com/Articles/56321/A-Windows-FTP-Application //https://www.codeproject.com/Articles/4472/Enhanced-BrowseForFolder-styled-TreeView //https://github.com/ChrisRichner/TreeViewFolderBrowser //https://www.codeproject.com/Articles/11991/An-FTP-client-library-for-NET //https://github.com/aybe/Windows-API-Code-Pack-1.1 //https://github.com/dbarros/WindowsAPICodePack   namespace FTPLibrary {     #region "FTP client class"     /// <summary>     /// A wrapper class for .NET 2.0 FTP     /// </summary>     /// <remarks>     /// This class does not hold open an FTP connection but     /// instead is stateless: for each FTP request it     /// connects, performs the request and disconnects.     /// </remarks>     public class FTPclient     {         #region Delegated & Events         //Download Progress Changed Event         public delegate void DownloadProgressChangedHandler(object sender, DownloadProgressChangedArgs e);         public event DownloadProgressChangedHandler OnDownloadProgressChanged;           //Download Completed Event         public delegate void DownloadCompletedHandler(object sender, DownloadCompletedArgs e);         public event DownloadCompletedHandler OnDownloadCompleted;           //New Server Message Event         public delegate void NewMessageHandler(object sender, NewMessageEventArgs e);         public event NewMessageHandler OnNewMessageReceived;           //Upload Progress Changed Event         //Download Progress Changed Event         public delegate void UploadProgressChangedHandler(object sender, UploadProgressChangedArgs e);         public event UploadProgressChangedHandler OnUploadProgressChanged;           //Upload Completed Event         public delegate void UploadCompletedHandler(object sender, UploadCompletedArgs e);         public event UploadCompletedHandler OnUploadCompleted;         #endregion           #region "CONSTRUCTORS"         /// <summary>         /// Blank constructor         /// </summary>         /// <remarks>Hostname, username and password must be set manually</remarks>         public FTPclient()         {         }           /// <summary>         /// Constructor just taking the hostname         /// </summary>         /// <param name="Hostname">in either ftp://ftp.host.com or ftp.host.com form</param>         /// <remarks></remarks>         public FTPclient(string Hostname)         {             _hostname = Hostname;         }           /// <summary>         /// Constructor taking hostname, username and password         /// </summary>         /// <param name="Hostname">in either ftp://ftp.host.com or ftp.host.com form</param>         /// <param name="Username">Leave blank to use 'anonymous' but set password to your email</param>         /// <param name="Password"></param>         /// <remarks></remarks>         public FTPclient(string Hostname, string Username, string Password)         {             _hostname = Hostname;             _username = Username;             _password = Password;         }         #endregion           #region "Directory functions"         /// <summary>         /// Return a simple directory listing         /// </summary>         /// <param name="directory">Directory to list, e.g. /pub</param>         /// <returns>A list of filenames and directories as a List(of String)</returns>         /// <remarks>For a detailed directory listing, use ListDirectoryDetail</remarks>         public List<string> ListDirectory(string directory)         {             //return a simple list of filenames in directory             System.Net.FtpWebRequest ftp = GetRequest(GetDirectory(directory));             //Set request to do simple list             ftp.Method = System.Net.WebRequestMethods.Ftp.ListDirectory;             //Give Message of Command             NewMessageEventArgs e = new NewMessageEventArgs("COMMAND", "List Directory", "NLST");             OnNewMessageReceived(this, e);               string str = GetStringResponse(ftp);             //replace CRLF to CR, remove last instance             str = str.Replace("\r\n", "\r").TrimEnd('\r');             //split the string into a list             List<string> result = new List<string>();             result.AddRange(str.Split('\r'));             return result;         }           /// <summary>         /// Return a detailed directory listing         /// </summary>         /// <param name="directory">Directory to list, e.g. /pub/etc</param>         /// <returns>An FTPDirectory object</returns>         public FTPdirectory ListDirectoryDetail(string directory)         {             System.Net.FtpWebRequest ftp = GetRequest(GetDirectory(directory));             //Set request to do simple list             ftp.Method = System.Net.WebRequestMethods.Ftp.ListDirectoryDetails;             ftp.UseBinary = true;             //Give Message of Command             NewMessageEventArgs e = new NewMessageEventArgs("COMMAND", "List Directory Details", "LIST");             OnNewMessageReceived(this, e);             string str = GetStringResponse(ftp);             //replace CRLF to CR, remove last instance             str = str.Replace("\r\n", "\r").TrimEnd('\r');             //split the string into a list             return new FTPdirectory(str, _lastDirectory);         }           #endregion           #region "Upload: File transfer TO ftp server"         /// <summary>         /// Copy a local file to the FTP server         /// </summary>         /// <param name="localFilename">Full path of the local file</param>         /// <param name="targetFilename">Target filename, if required</param>         /// <returns></returns>         /// <remarks>If the target filename is blank, the source filename is used         /// (assumes current directory). Otherwise use a filename to specify a name         /// or a full path and filename if required.</remarks>         public bool Upload(string localFilename, string targetFilename)         {             //1. check source             if (!File.Exists(localFilename))             {                 throw (new ApplicationException("File " + localFilename + " not found"));             }             //copy to FI             FileInfo fi = new FileInfo(localFilename);             return Upload(fi, targetFilename);         }           #region Upload Variables         System.Net.FtpWebRequest UploadFTPRequest = null;         FileStream UploadFileStream = null;         Stream UploadStream = null;         bool UploadCanceled = false;         FileInfo UploadFileInfo = null;         #endregion           /// <summary>         /// Upload a local file to the FTP server         /// </summary>         /// <param name="fi">Source file</param>         /// <param name="targetFilename">Target filename (optional)</param>         /// <returns></returns>         public bool Upload(FileInfo fi, string targetFilename)         {             //copy the file specified to target file: target file can be full path or just filename (uses current dir)               //1. check target             string target;             if (targetFilename.Trim() == "")             {                 //Blank target: use source filename & current dir                 target = this.CurrentDirectory + fi.Name;             }             else if (targetFilename.Contains("/"))             {                 //If contains / treat as a full path                 target = AdjustDir(targetFilename);             }             else             {                 //otherwise treat as filename only, use current directory                 target = CurrentDirectory + targetFilename;             }               string URI = Hostname + target;             //perform copy             UploadFTPRequest = GetRequest(URI);               //Set request to upload a file in binary             UploadFTPRequest.Method = System.Net.WebRequestMethods.Ftp.UploadFile;             UploadFTPRequest.UseBinary = true;             //Notify FTP of the expected size             UploadFTPRequest.ContentLength = fi.Length;             UploadFileInfo = fi;               //create byte array to store: ensure at least 1 byte!             const int BufferSize = 2048;             byte[] content = new byte[BufferSize - 1 + 1];             int dataRead;               //open file for reading             using (UploadFileStream = fi.OpenRead())             {                 try                 {                     //open request to send                     using (UploadStream = UploadFTPRequest.GetRequestStream())                     {                         //Give Message of Command                         NewMessageEventArgs e = new NewMessageEventArgs("COMMAND", "Upload File", "STOR");                         OnNewMessageReceived(this, e);                           //Get File Size                         Int64 TotalBytesUploaded = 0;                         Int64 FileSize = fi.Length;                         do                         {                             if (UploadCanceled)                             {                                 NewMessageEventArgs CancelMessage = new NewMessageEventArgs("RESPONSE", "Upload Canceled.", "CANCEL");                                 OnNewMessageReceived(this, CancelMessage);                                 UploadCanceled = false;                                 return false;                             }                               dataRead = UploadFileStream.Read(content, 0, BufferSize);                             UploadStream.Write(content, 0, dataRead);                             TotalBytesUploaded += dataRead;                             //Declare Event                             UploadProgressChangedArgs DownloadProgress = new UploadProgressChangedArgs(TotalBytesUploaded, FileSize);                               //Progress changed, Raise the event.                             OnUploadProgressChanged(this, DownloadProgress);                               System.Windows.Forms.Application.DoEvents();                         } while (!(dataRead < BufferSize));                           //Get Message and Raise Event                         NewMessageEventArgs UPloadResponse = new NewMessageEventArgs("RESPONSE", "File Uploaded!", "STOR");                         OnNewMessageReceived(this, UPloadResponse);                           //Declare Event                         UploadCompletedArgs Args = new UploadCompletedArgs("Successful", true);                         //Raise Event                         OnUploadCompleted(this, Args);                           UploadStream.Close();                     }                   }                 catch (Exception ex)                 {                     //Declare Event                     UploadCompletedArgs Args = new UploadCompletedArgs("Error: " + ex.Message, false);                     //Raise Event                     OnUploadCompleted(this, Args);                 }                 finally                 {                     //ensure file closed                     UploadFileStream.Close();                 }               }                 UploadFTPRequest = null;             return true;           }           public void CancelUpload(string UploadFileName)         {             if (UploadFileStream != null)             {                 UploadFileStream.Close();                 UploadFTPRequest.Abort();                 //UploadFileInfo.Delete();                 UploadCanceled = true;                 UploadFTPRequest = null;                 this.FtpDelete(UploadFileName);                 MessageBox.Show("Upload Canceled");             }         }         #endregion           #region "Download: File transfer FROM ftp server"         /// <summary>         /// Copy a file from FTP server to local         /// </summary>         /// <param name="sourceFilename">Target filename, if required</param>         /// <param name="localFilename">Full path of the local file</param>         /// <returns></returns>         /// <remarks>Target can be blank (use same filename), or just a filename         /// (assumes current directory) or a full path and filename</remarks>         public bool Download(string sourceFilename, string localFilename, bool PermitOverwrite)         {             //2. determine target file             FileInfo fi = new FileInfo(localFilename);             return this.Download(sourceFilename, fi, PermitOverwrite);         }           //Version taking an FtpFileInfo         public bool Download(FTPfileInfo file, string localFilename, bool PermitOverwrite)         {             return this.Download(file.FullName, localFilename, PermitOverwrite);         }           //Another version taking FtpFileInfo and FileInfo         public bool Download(FTPfileInfo file, FileInfo localFI, bool PermitOverwrite)         {             return this.Download(file.FullName, localFI, PermitOverwrite);         }           #region Download Variables         System.Net.FtpWebRequest DownloadFTPRequest = null;         FtpWebResponse DownloadResponse = null;         Stream DownloadResponseStream = null;   //中文亂碼         FileStream DownloadFileStream = null;         FileInfo TargetFileInfo = null;         bool DownloadCanceled = false;         #endregion         //Version taking string/FileInfo         public bool Download(string sourceFilename, FileInfo targetFI, bool PermitOverwrite)         {             //1. check target             if (targetFI.Exists && !(PermitOverwrite))             {                 throw (new ApplicationException("Target file already exists"));             }               //2. check source             string target;             if (sourceFilename.Trim() == "")             {                 throw (new ApplicationException("File not specified"));             }             else if (sourceFilename.Contains("/"))             {                 //treat as a full path                 target = AdjustDir(sourceFilename);             }             else             {                 //treat as filename only, use current directory                 target = CurrentDirectory + sourceFilename;             }               string URI = Hostname + target;               //3. perform copy             DownloadFTPRequest = GetRequest(URI);               //Set request to download a file in binary mode             DownloadFTPRequest.Method = System.Net.WebRequestMethods.Ftp.DownloadFile;             DownloadFTPRequest.UseBinary = true;             TargetFileInfo = targetFI;             //open request and get response stream             using (DownloadResponse = (FtpWebResponse)DownloadFTPRequest.GetResponse())             {                 using (DownloadResponseStream = DownloadResponse.GetResponseStream())                 {                     //System.Security.AccessControl.FileSecurity fileSecurity = new System.Security.AccessControl.FileSecurity(targetFI.FullName, System.Security.AccessControl.AccessControlSections.All);                     //targetFI.SetAccessControl(fileSecurity);                     //loop to read & write to file                     using (DownloadFileStream = new FileStream(targetFI.FullName, FileMode.OpenOrCreate, FileAccess.ReadWrite))                     {                         try                         {                             //Give Message of Command                             NewMessageEventArgs e = new NewMessageEventArgs("COMMAND", "Download File", "RETR");                             OnNewMessageReceived(this, e);                             byte[] buffer = new byte[2048];                             int read = 0;                             Int64 TotalBytesRead = 0;                             Int64 FileSize = this.GetFileSize(sourceFilename);                             DownloadCanceled = false;                             do                             {                                 if (DownloadCanceled)                                 {                                     NewMessageEventArgs CancelMessage = new NewMessageEventArgs("RESPONSE", "Download Canceled.", "CANCEL");                                       DownloadCanceled = false;                                     OnNewMessageReceived(this, CancelMessage);                                     return false;                                 }                                   read = DownloadResponseStream.Read(buffer, 0, buffer.Length);                                 DownloadFileStream.Write(buffer, 0, read);                                 TotalBytesRead += read;                                 //Declare Event                                 DownloadProgressChangedArgs DownloadProgress = new DownloadProgressChangedArgs(TotalBytesRead, FileSize);                                   //Progress changed, Raise the event.                                 OnDownloadProgressChanged(this, DownloadProgress);                                   System.Windows.Forms.Application.DoEvents();                               } while (!(read == 0));                                 //Get Message and Raise Event                             NewMessageEventArgs NewMessageArgs = new NewMessageEventArgs("RESPONSE", DownloadResponse.StatusDescription, DownloadResponse.StatusCode.ToString());                             OnNewMessageReceived(this, NewMessageArgs);                               //Declare Event                             DownloadCompletedArgs Args = new DownloadCompletedArgs("Successful", true);                             //Raise Event                             OnDownloadCompleted(this, Args);                               DownloadResponseStream.Close();                             DownloadFileStream.Flush();                             DownloadFileStream.Close();                             DownloadFileStream = null;                             DownloadResponseStream = null;                         }                         catch (Exception ex)                         {                             //catch error and delete file only partially downloaded                             DownloadFileStream.Close();                             //delete target file as it's incomplete                             targetFI.Delete();                               //Decalre Event for Error                             DownloadCompletedArgs DownloadCompleted = new DownloadCompletedArgs("Error: " + ex.Message, false);                             //Raise Event                             OnDownloadCompleted(this, DownloadCompleted);                         }                     }                     if (DownloadFileStream != null)                         DownloadResponseStream.Close();                 }                 if (DownloadFileStream != null)                     DownloadResponse.Close();             }             return true;         }           public void CancelDownload()         {             if (DownloadFileStream != null)             {                 DownloadFileStream.Close();                   DownloadFTPRequest.Abort();                   DownloadResponse.Close();                 DownloadResponseStream.Close();                 //DownloadFileStream = null;                 //DownloadResponseStream = null;                 TargetFileInfo.Delete();                 DownloadCanceled = true;                 MessageBox.Show("Download Canceled");             }         }         #endregion           #region "Other functions: Delete rename etc."         /// <summary>         /// Delete remote file         /// </summary>         /// <param name="filename">filename or full path</param>         /// <returns></returns>         /// <remarks></remarks>         public bool FtpDelete(string filename)         {             //Determine if file or full path             string URI = this.Hostname + GetFullPath(filename);               System.Net.FtpWebRequest ftp = GetRequest(URI);             //Set request to delete             ftp.Method = System.Net.WebRequestMethods.Ftp.DeleteFile;             try             {                 //get response but ignore it                 string str = GetStringResponse(ftp);                 //Give Message of Command                 NewMessageEventArgs e = new NewMessageEventArgs("COMMAND", "Delete File", "DELE");                 OnNewMessageReceived(this, e);             }             catch (Exception)             {                 return false;             }             return true;         }           /// <summary>         /// Determine if file exists on remote FTP site         /// </summary>         /// <param name="filename">Filename (for current dir) or full path</param>         /// <returns></returns>         /// <remarks>Note this only works for files</remarks>         public bool FtpFileExists(string filename)         {             //Try to obtain filesize: if we get error msg containing "550"             //the file does not exist             try             {                 long size = GetFileSize(filename);                 return true;               }             catch (Exception ex)             {                 //only handle expected not-found exception                 if (ex is System.Net.WebException)                 {                     //file does not exist/no rights error = 550                     if (ex.Message.Contains("550"))                     {                         //clear                         return false;                     }                     else                     {                         System.Windows.Forms.MessageBox.Show(ex.Message);                         return false;                     }                 }                 else                 {                     System.Windows.Forms.MessageBox.Show(ex.Message);                     return false;                 }             }         }           /// <summary>         /// Determine size of remote file         /// </summary>         /// <param name="filename"></param>         /// <returns></returns>         /// <remarks>Throws an exception if file does not exist</remarks>         public long GetFileSize(string filename)         {             string path;             if (filename.Contains("/"))             {                 path = AdjustDir(filename);             }             else             {                 path = this.CurrentDirectory + filename;             }             string URI = this.Hostname + path;             System.Net.FtpWebRequest ftp = GetRequest(URI);             //Try to get info on file/dir?             ftp.Method = System.Net.WebRequestMethods.Ftp.GetFileSize;             string tmp = this.GetStringResponse(ftp);             //Give Message of Command             NewMessageEventArgs e = new NewMessageEventArgs("COMMAND", "Get File Size", "SIZE");             OnNewMessageReceived(this, e);             return GetSize(ftp);         }           public bool FtpRename(string sourceFilename, string newName)         {             //Does file exist?             string source = GetFullPath(sourceFilename);             if (!FtpFileExists(source))             {                 throw (new FileNotFoundException("File " + source + " not found"));             }               //build target name, ensure it does not exist             string target = GetFullPath(newName);             if (target == source)             {                 throw (new ApplicationException("Source and target are the same"));             }             else if (FtpFileExists(target))             {                 throw (new ApplicationException("Target file " + target + " already exists"));             }               //perform rename             string URI = this.Hostname + source;               System.Net.FtpWebRequest ftp = GetRequest(URI);             //Set request to delete             ftp.Method = System.Net.WebRequestMethods.Ftp.Rename;             ftp.RenameTo = target;             ftp.UseBinary = true;               try             {                 //get response but ignore it                 string str = GetStringResponse(ftp);                 //Give Message of Command                 NewMessageEventArgs e = new NewMessageEventArgs("COMMAND", "File Rename", "RENAME");                 OnNewMessageReceived(this, e);             }             catch (Exception)             {                 return false;             }             return true;         }           public bool FtpCreateDirectory(string dirpath)         {             //perform create             string URI = this.Hostname + AdjustDir(dirpath);             System.Net.FtpWebRequest ftp = GetRequest(URI);             //Set request to MkDir             ftp.Method = System.Net.WebRequestMethods.Ftp.MakeDirectory;             try             {                 //get response but ignore it                 string str = GetStringResponse(ftp);                 //Give Message of Command                 NewMessageEventArgs e = new NewMessageEventArgs("COMMAND", "Make Directory", "MKD");                 OnNewMessageReceived(this, e);             }             catch (Exception)             {                 return false;             }             return true;         }           public bool FtpDeleteDirectory(string dirpath)         {             //perform remove             string URI = this.Hostname + AdjustDir(dirpath);             System.Net.FtpWebRequest ftp = GetRequest(URI);             ftp.UseBinary = true;             //Set request to RmDir             ftp.Method = System.Net.WebRequestMethods.Ftp.RemoveDirectory;             try             {                 //get response but ignore it                 string str = GetStringResponse(ftp);                 //Give Message of Command                 NewMessageEventArgs e = new NewMessageEventArgs("COMMAND", "Remove Directory", "RMD");                 OnNewMessageReceived(this, e);             }             catch (Exception)             {                 return false;             }             return true;         }         #endregion           #region "private supporting fns"         //Get the basic FtpWebRequest object with the         //common settings and security         private FtpWebRequest GetRequest(string URI)         {             //create request             FtpWebRequest result = (FtpWebRequest)FtpWebRequest.Create(URI);             //Set the login details             result.Credentials = GetCredentials();             //Do not keep alive (stateless mode)             result.KeepAlive = false;             result.UseBinary = true;             return result;         }             /// <summary>         /// Get the credentials from username/password         /// </summary>         private System.Net.ICredentials GetCredentials()         {             return new System.Net.NetworkCredential(Username, Password);         }           /// <summary>         /// returns a full path using CurrentDirectory for a relative file reference         /// </summary>         private string GetFullPath(string file)         {             if (file.Contains("/"))             {                 return AdjustDir(file);             }             else             {                 return this.CurrentDirectory + file;             }         }           /// <summary>         /// Amend an FTP path so that it always starts with /         /// </summary>         /// <param name="path">Path to adjust</param>         /// <returns></returns>         /// <remarks></remarks>         private string AdjustDir(string path)         {             return ((path.StartsWith("/")) ? "" : "/").ToString() + path;         }           private string GetDirectory(string directory)         {             string URI;             if (directory == "")             {                 //build from current                 URI = Hostname + this.CurrentDirectory;                 _lastDirectory = this.CurrentDirectory;             }             else             {                 if (!directory.StartsWith("/"))                 {                     throw (new ApplicationException("Directory should start with /"));                 }                 URI = this.Hostname + directory;                 _lastDirectory = directory;             }             return URI;         }           //stores last retrieved/set directory         private string _lastDirectory = "";           /// <summary>         /// Obtains a response stream as a string         /// </summary>         /// <param name="ftp">current FTP request</param>         /// <returns>String containing response</returns>         /// <remarks>FTP servers typically return strings with CR and         /// not CRLF. Use respons.Replace(vbCR, vbCRLF) to convert         /// to an MSDOS string</remarks>         private string GetStringResponse(FtpWebRequest ftp)         {             //Get the result, streaming to a string             string result = "";             using (FtpWebResponse response = (FtpWebResponse)ftp.GetResponse())             {                 long size = response.ContentLength;                 using (Stream datastream = response.GetResponseStream())                 {                     // 一中文亂碼問題 涂聚文 20180801                     using (StreamReader sr = new StreamReader(datastream, System.Text.Encoding.GetEncoding("GB2312")))                     {                         _WelcomeMessage = response.WelcomeMessage;                         _ExitMessage = response.ExitMessage;                         result = sr.ReadToEnd();                         sr.Close();                     }                     try                     {                         //Declare Event                         NewMessageEventArgs e = new NewMessageEventArgs("RESPONSE", response.StatusDescription, response.StatusCode.ToString());                         //Raise Event                         OnNewMessageReceived(this, e);                     }                     catch                     {                       }                       datastream.Close();                 }                 response.Close();             }             return result;         }           /// <summary>         /// Gets the size of an FTP request         /// </summary>         /// <param name="ftp"></param>         /// <returns></returns>         /// <remarks></remarks>         private long GetSize(FtpWebRequest ftp)         {             long size;             using (FtpWebResponse response = (FtpWebResponse)ftp.GetResponse())             {                 size = response.ContentLength;                 response.Close();             }               return size;         }         #endregion           #region "Properties"         private string _hostname;         /// <summary>         /// Hostname         /// </summary>         /// <value></value>         /// <remarks>Hostname can be in either the full URL format         /// ftp://ftp.myhost.com or just ftp.myhost.com         /// </remarks>         public string Hostname         {             get             {                 if (_hostname.StartsWith("ftp://"))                 {                     return _hostname;                 }                 else                 {                     return "ftp://" + _hostname;                 }             }             set             {                 _hostname = value;             }         }         private string _username;         /// <summary>         /// Username property         /// </summary>         /// <value></value>         /// <remarks>Can be left blank, in which case 'anonymous' is returned</remarks>         public string Username         {             get             {                 return (_username == "" ? "anonymous" : _username);             }             set             {                 _username = value;             }         }         private string _password;         public string Password         {             get             {                 return _password;             }             set             {                 _password = value;             }         }           /// <summary>         /// The CurrentDirectory value         /// </summary>         /// <remarks>Defaults to the root '/'</remarks>         private string _currentDirectory = "/";         public string CurrentDirectory         {             get             {                 //return directory, ensure it ends with /                 return _currentDirectory + ((_currentDirectory.EndsWith("/")) ? "" : "/").ToString();             }             set             {                 if (!value.StartsWith("/"))                 {                     throw (new ApplicationException("Directory should start with /"));                 }                 _currentDirectory = value;             }         }             #endregion           #region Server Messages         string _WelcomeMessage, _ExitMessage;         public string WelcomeMessage         {             get             {                 return _WelcomeMessage;             }             set             {                 _WelcomeMessage = value;             }         }         public string ExitMessage         {             get             {                 return _ExitMessage;             }             set             {                 _ExitMessage = value;             }         }         #endregion       }     #endregion       #region "FTP file info class"     /// <summary>     /// Represents a file or directory entry from an FTP listing     /// </summary>     /// <remarks>     /// This class is used to parse the results from a detailed     /// directory list from FTP. It supports most formats of     /// </remarks>     public class FTPfileInfo     {           //Stores extended info about FTP file           #region "Properties"         public string FullName         {             get             {                 return Path + Filename;             }         }         public string Filename         {             get             {                 return _filename;             }         }         public string Path         {             get             {                 return _path;             }         }         public DirectoryEntryTypes FileType         {             get             {                 return _fileType;             }         }         public long Size         {             get             {                 return _size;             }         }         public DateTime FileDateTime         {             get             {                 return _fileDateTime;             }         }         public string Permission         {             get             {                 return _permission;             }         }         public string Extension         {             get             {                 int i = this.Filename.LastIndexOf(".");                 if (i >= 0 && i < (this.Filename.Length - 1))                 {                     return this.Filename.Substring(i + 1);                 }                 else                 {                     return "";                 }             }         }         public string NameOnly         {             get             {                 int i = this.Filename.LastIndexOf(".");                 if (i > 0)                 {                     return this.Filename.Substring(0, i);                 }                 else                 {                     return this.Filename;                 }             }         }         private string _filename;         private string _path;         private DirectoryEntryTypes _fileType;         private long _size;         private DateTime _fileDateTime;         private string _permission;           #endregion           /// <summary>         /// Identifies entry as either File or Directory         /// </summary>         public enum DirectoryEntryTypes         {             File,             Directory         }           /// <summary>         /// Constructor taking a directory listing line and path         /// </summary>         /// <param name="line">The line returned from the detailed directory list</param>         /// <param name="path">Path of the directory</param>         /// <remarks></remarks>         public FTPfileInfo(string line, string path)         {             //parse line             Match m = GetMatchingRegex(line);             if (m == null)             {                 //failed                 throw (new ApplicationException("Unable to parse line: " + line));             }             else             {                 _filename = m.Groups["name"].Value;                 _path = path;                   Int64.TryParse(m.Groups["size"].Value, out _size);                 //_size = System.Convert.ToInt32(m.Groups["size"].Value);                   _permission = m.Groups["permission"].Value;                 string _dir = m.Groups["dir"].Value;                 if (_dir != "" && _dir != "-")                 {                     _fileType = DirectoryEntryTypes.Directory;                 }                 else                 {                     _fileType = DirectoryEntryTypes.File;                 }                   try                 {                     _fileDateTime = DateTime.Parse(m.Groups["timestamp"].Value);                 }                 catch (Exception)                 {                     _fileDateTime = Convert.ToDateTime(null);                 }               }         }           private Match GetMatchingRegex(string line)         {             Regex rx;             Match m;             for (int i = 0; i <= _ParseFormats.Length - 1; i++)             {                 rx = new Regex(_ParseFormats[i]);                 m = rx.Match(line);                 if (m.Success)                 {                     return m;                 }             }             return null;         }           #region "Regular expressions for parsing LIST results"         /// <summary>         /// List of REGEX formats for different FTP server listing formats         /// </summary>         /// <remarks>         /// The first three are various UNIX/LINUX formats, fourth is for MS FTP         /// in detailed mode and the last for MS FTP in 'DOS' mode.         /// I wish VB.NET had support for Const arrays like C# but there you go         /// </remarks>         private static string[] _ParseFormats = new string[] {             "(?<dir>[\\-d])(?<permission>([\\-r][\\-w][\\-xs]){3})\\s+\\d+\\s+\\w+\\s+\\w+\\s+(?<size>\\d+)\\s+(?<timestamp>\\w+\\s+\\d+\\s+\\d{4})\\s+(?<name>.+)",             "(?<dir>[\\-d])(?<permission>([\\-r][\\-w][\\-xs]){3})\\s+\\d+\\s+\\d+\\s+(?<size>\\d+)\\s+(?<timestamp>\\w+\\s+\\d+\\s+\\d{4})\\s+(?<name>.+)",             "(?<dir>[\\-d])(?<permission>([\\-r][\\-w][\\-xs]){3})\\s+\\d+\\s+\\d+\\s+(?<size>\\d+)\\s+(?<timestamp>\\w+\\s+\\d+\\s+\\d{1,2}:\\d{2})\\s+(?<name>.+)",             "(?<dir>[\\-d])(?<permission>([\\-r][\\-w][\\-xs]){3})\\s+\\d+\\s+\\w+\\s+\\w+\\s+(?<size>\\d+)\\s+(?<timestamp>\\w+\\s+\\d+\\s+\\d{1,2}:\\d{2})\\s+(?<name>.+)",             "(?<dir>[\\-d])(?<permission>([\\-r][\\-w][\\-xs]){3})(\\s+)(?<size>(\\d+))(\\s+)(?<ctbit>(\\w+\\s\\w+))(\\s+)(?<size2>(\\d+))\\s+(?<timestamp>\\w+\\s+\\d+\\s+\\d{2}:\\d{2})\\s+(?<name>.+)",             "(?<timestamp>\\d{2}\\-\\d{2}\\-\\d{2}\\s+\\d{2}:\\d{2}[Aa|Pp][mM])\\s+(?<dir>\\<\\w+\\>){0,1}(?<size>\\d+){0,1}\\s+(?<name>.+)" };         #endregion     }     #endregion       #region "FTP Directory class"     /// <summary>     /// Stores a list of files and directories from an FTP result     /// </summary>     /// <remarks></remarks>     public class FTPdirectory : List<FTPfileInfo>     {             public FTPdirectory()         {             //creates a blank directory listing         }           /// <summary>         /// Constructor: create list from a (detailed) directory string         /// </summary>         /// <param name="dir">directory listing string</param>         /// <param name="path"></param>         /// <remarks></remarks>         public FTPdirectory(string dir, string path)         {             foreach (string line in dir.Replace("\n", "").Split(System.Convert.ToChar('\r')))             {                 //parse                 if (line != "")                 {                     this.Add(new FTPfileInfo(line, path));                 }             }         }           /// <summary>         /// Filter out only files from directory listing         /// </summary>         /// <param name="ext">optional file extension filter</param>         /// <returns>FTPdirectory listing</returns>         public FTPdirectory GetFiles(string ext)         {             return this.GetFileOrDir(FTPfileInfo.DirectoryEntryTypes.File, ext);         }           /// <summary>         /// Returns a list of only subdirectories         /// </summary>         /// <returns>FTPDirectory list</returns>         /// <remarks></remarks>         public FTPdirectory GetDirectories()         {             return this.GetFileOrDir(FTPfileInfo.DirectoryEntryTypes.Directory, "");         }           //internal: share use function for GetDirectories/Files         private FTPdirectory GetFileOrDir(FTPfileInfo.DirectoryEntryTypes type, string ext)         {             FTPdirectory result = new FTPdirectory();             foreach (FTPfileInfo fi in this)             {                 if (fi.FileType == type)                 {                     if (ext == "")                     {                         result.Add(fi);                     }                     else if (ext == fi.Extension)                     {                         result.Add(fi);                     }                 }             }             return result;           }           public bool FileExists(string filename)         {             foreach (FTPfileInfo ftpfile in this)             {                 if (ftpfile.Filename == filename)                 {                     return true;                 }             }             return false;         }           private const char slash = '/';           public static string GetParentDirectory(string dir)         {             string tmp = dir.TrimEnd(slash);             int i = tmp.LastIndexOf(slash);             if (i > 0)             {                 return tmp.Substring(0, i - 1);             }             else             {                 throw (new ApplicationException("No parent for root"));             }         }     }     #endregion       #region Events     public class DownloadProgressChangedArgs : EventArgs     {         //Private Members         private Int64 _BytesDownload;         private Int64 _TotalBytes;           //Constructor         public DownloadProgressChangedArgs(Int64 BytesDownload, Int64 TotleBytes)         {             this._BytesDownload = BytesDownload;             this._TotalBytes = TotleBytes;         }           //Public Members         public Int64 BytesDownloaded { get { return _BytesDownload; } }         public Int64 TotleBytes { get { return _TotalBytes; } }     }       public class DownloadCompletedArgs : EventArgs     {         //Private Members         private bool _DownloadedCompleted;         private string _DownloadStatus;           //Constructor         public DownloadCompletedArgs(string Status, bool Completed)         {             this._DownloadedCompleted = Completed;             this._DownloadStatus = Status;         }           //Public Members         public String DownloadStatus { get { return _DownloadStatus; } }         public bool DownloadCompleted { get { return _DownloadedCompleted; } }     }       public class NewMessageEventArgs : EventArgs     {         //Private Members         private string _Message;         private string _StatusCode;         private string _Type;           //Constructor         public NewMessageEventArgs(string Type, string Status, string Code)         {             this._Message = Status;             this._StatusCode = Code;             this._Type = Type;         }           //Public Members         public string StatusMessage { get { return _Message; } }         public string StatusCode { get { return _StatusCode; } }         public string StatusType { get { return _Type; } }     }       public class UploadProgressChangedArgs : EventArgs     {         //Private Members         private Int64 _BytesUpload;         private Int64 _TotalBytes;           //Constructor         public UploadProgressChangedArgs(Int64 BytesUpload, Int64 TotleBytes)         {             this._BytesUpload = BytesUpload;             this._TotalBytes = TotleBytes;         }           //Public Members         public Int64 BytesUploaded { get { return _BytesUpload; } }         public Int64 TotleBytes { get { return _TotalBytes; } }     }       public class UploadCompletedArgs : EventArgs     {         //Private Members         private bool _UploadCompleted;         private string _UploadStatus;           //Constructor         public UploadCompletedArgs(string Status, bool Completed)         {             this._UploadCompleted = Completed;             this._UploadStatus = Status;         }           //Public Members         public String UploadStatus { get { return _UploadStatus; } }         public bool UploadCompleted { get { return _UploadCompleted; } }     }     #endregion }

　　测试代码：

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using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using System.Net; using FTPLibrary; using System.Diagnostics; using System.Reflection; using System.IO;     namespace ftpdemo {       /// <summary>     /// 涂聚文 2017-08-01     /// </summary>     public partial class Form6 : Form     {         public FTPclient FtpClient;         ListViewItem Message;         string remotingFolder = System.Configuration.ConfigurationManager.AppSettings["remotingFolder"];  //远程ftp文件目录         string localFolder = System.Configuration.ConfigurationManager.AppSettings["localFolder"];  //要下载到的本地目录         string ftpServer = System.Configuration.ConfigurationManager.AppSettings["ftpServer"];  //ftp服务器         string user = System.Configuration.ConfigurationManager.AppSettings["user"];  //用户名         string pwd = System.Configuration.ConfigurationManager.AppSettings["pwd"];  //密码         string port = System.Configuration.ConfigurationManager.AppSettings["port"];  //端口           /// <summary>         ///         /// </summary>         /// <param name="byteCount"></param>         /// <returns></returns>         private string GetFileSize(double byteCount)         {             string size = "0 Bytes";             if (byteCount >= 1073741824.0)                 size = String.Format("{0:##.##}", byteCount / 1073741824.0) + " GB";             else if (byteCount >= 1048576.0)                 size = String.Format("{0:##.##}", byteCount / 1048576.0) + " MB";             else if (byteCount >= 1024.0)                 size = String.Format("{0:##.##}", byteCount / 1024.0) + " KB";             else if (byteCount > 0 && byteCount < 1024.0)                 size = byteCount.ToString() + " Bytes";               return size;         }         /// <summary>         /// Sets up the FTPClient for this Form.  Called from frmLogin.         /// </summary>         /// <param name="client">FTPclient on frmLogin is used to refrence the FtpClient here.</param>         public void SetFtpClient(FTPclient client)         {             //Set FtpClient             FtpClient = client;               //Display the Welcome Message             Message = new ListViewItem();             Message.Text = DateTime.Now.ToLongTimeString() + " " + DateTime.Now.ToLongDateString();             Message.SubItems.Add("Welcome Message");             Message.SubItems.Add(FtpClient.WelcomeMessage);             Message.SubItems.Add("No Code");             Message.SubItems.Add("/");             lstMessages.Items.Add(Message);               //Setup OnMessageReceived Event             FtpClient.OnNewMessageReceived += new FTPclient.NewMessageHandler(FtpClient_OnNewMessageReceived);               //Open and Display Root Directory and Files/Folders in it             foreach (FTPfileInfo folder in FtpClient.ListDirectoryDetail("/"))             {                 ListViewItem item = new ListViewItem();                 item.Text = folder.Filename;                 if (folder.FileType == FTPfileInfo.DirectoryEntryTypes.Directory)                     item.SubItems.Add("Folder");                 else                     item.SubItems.Add("File");                   item.SubItems.Add(folder.FullName);                 item.SubItems.Add(folder.Permission);                 item.SubItems.Add(folder.FileDateTime.ToShortTimeString() + folder.FileDateTime.ToShortDateString());                 item.SubItems.Add(GetFileSize(folder.Size));                 lstRemoteSiteFiles.Items.Add(item);             }         }         /// <summary>         ///         /// </summary>         /// <param name="myObject"></param>         /// <param name="e"></param>         private void FtpClient_OnNewMessageReceived(object myObject, NewMessageEventArgs e)         {             //Display Meesage in lstMessages             Message = new ListViewItem();             Message.Text = DateTime.Now.ToLongTimeString() + " " + DateTime.Now.ToLongDateString();             Message.SubItems.Add(e.StatusType);             Message.SubItems.Add(e.StatusMessage);             Message.SubItems.Add(e.StatusCode);             Message.SubItems.Add(txtRemoteDirectory.Text);             lstMessages.Items.Add(Message);               this.lstMessages.EnsureVisible(this.lstMessages.Items.Count - 1);         }         /// <summary>         /// Reload all Directories and Files in Current Directory         /// </summary>         private void RefreshDirectory()         {             //Clear all items             lstRemoteSiteFiles.Items.Clear();               //Open and Display Root Directory             foreach (FTPfileInfo folder in FtpClient.ListDirectoryDetail(txtRemoteDirectory.Text))             {                 ListViewItem item = new ListViewItem();                 item.Text = folder.Filename;                 if (folder.FileType == FTPfileInfo.DirectoryEntryTypes.Directory)                     item.SubItems.Add("Folder");                 else                     item.SubItems.Add("File");                   item.SubItems.Add(folder.FullName);                 item.SubItems.Add(folder.Permission);                 item.SubItems.Add(folder.FileDateTime.ToShortTimeString() + folder.FileDateTime.ToShortDateString());                 item.SubItems.Add(folder.Size.ToString());                 lstRemoteSiteFiles.Items.Add(item);             }         }         /// <summary>         ///         /// </summary>         public Form6()         {             InitializeComponent();               //Set Selected Directory             txtRemoteDirectory.Text = "/";             lstRemoteSiteFiles.FullRowSelect = true;          }         /// <summary>         ///         /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         private void Form6_Load(object sender, EventArgs e)         {             //Set FTP             FTPclient objFtp = new FTPclient(ftpServer, user,pwd);             objFtp.CurrentDirectory = "/";             SetFtpClient(objFtp);           }         /// <summary>         ///         /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         private void lstRemoteSiteFiles_SelectedIndexChanged(object sender, EventArgs e)         {           }         /// <summary>         ///         /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         private void lstRemoteSiteFiles_MouseDoubleClick(object sender, MouseEventArgs e)         {             if (lstRemoteSiteFiles.Items.Count != 0)             {                 try                 {                     if (lstRemoteSiteFiles.SelectedItems[0].SubItems[1].Text == "File")                     {                         //Enable the buttons that are related to the FILE                        // btnRename.Enabled = true;                        // btnDownload.Enabled = true;                         //Set Current Directory for Download                         FtpClient.CurrentDirectory = txtRemoteDirectory.Text;                         //Its a File, so Ask them if they want to Save it...                         if (MessageBox.Show("Do you want to save this file: " + txtRemoteDirectory.Text + lstRemoteSiteFiles.SelectedItems[0].Text + "/" + "?", "Download File?", MessageBoxButtons.YesNo, MessageBoxIcon.Question, MessageBoxDefaultButton.Button1) == DialogResult.Yes)                         {                             //Save the File to location                             //downloadToolStripMenuItem_Click(this, e);                         }                     }                     else if (lstRemoteSiteFiles.SelectedItems[0].SubItems[1].Text == "Folder") // Its a Directory                     {                         //Set Directory to txtRemoteDirectory.Text + selectedItem + "/"                         //Result - /SelectedDirecotory/  -- good for navigation, keeping user informed and code :)                         txtRemoteDirectory.Text += lstRemoteSiteFiles.SelectedItems[0].Text + "/";                         lstRemoteSiteFiles.Items.Clear();                           //Set Current Dir                         FtpClient.CurrentDirectory = txtRemoteDirectory.Text;                           //Get Files and Folders from Selected Direcotry                         foreach (FTPfileInfo folder in FtpClient.ListDirectoryDetail(txtRemoteDirectory.Text))                         {                             ListViewItem item = new ListViewItem();                             item.Text = folder.Filename;                             if (folder.FileType == FTPfileInfo.DirectoryEntryTypes.Directory)                                 item.SubItems.Add("Folder");                             else                                 item.SubItems.Add("File");                               item.SubItems.Add(folder.FullName);                             item.SubItems.Add(folder.Permission);                             item.SubItems.Add(folder.FileDateTime.ToShortDateString()+" "+folder.FileDateTime.ToShortTimeString());                             item.SubItems.Add(GetFileSize(folder.Size));                             lstRemoteSiteFiles.Items.Add(item);                         }                     }                 }                 catch { }             }         }         /// <summary>         ///         /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         private void lstRemoteSiteFiles_ItemDrag(object sender, ItemDragEventArgs e)         {           }     } }