FTP is an 8-bit client server protocol that can operate any type of file without further processing, just like MIME or Unicode. FTPHelper can be a related auxiliary class of FTP operation through FtpWebRequest class, NetworkCredential class and WebRequestMethods class in C ා.
Let's first look at MSDN's definition and explanation of the above categories:
FTP webrequest class: implements the file transfer protocol (FTP) client. To get the instance FtpWebRequest of, use the Create method. In addition, you can use the WebClient class to upload and download information from the FTP server. Using either method, the FTP webrequest class provides the ability to programmatically interact with the FTP server when you specify a network resource that uses the FTP scheme (for example, "FTP: / / Contoso. Com").
NetworkCredential class: provides credentials for password based authentication schemes such as basic, digest, NTLM, and Kerberos authentication.
WebRequestMethods class: WebRequestMethods.Ftp,WebRequestMethods.File Sum WebRequestMethods.Http Class. Cannot inherit this class.
The encapsulated help classes of FTPHelper are as follows, including several common methods, such as connecting to FTP server, uploading files to FTP server, downloading FTP server files, deleting FTP server files, and obtaining details under the current directory. The specific implementation is as follows:
public class FTPHelper { #region field string ftpURI; string ftpUserID; string ftpServerIP; string ftpPassword; string ftpRemotePath; #endregion /// <summary> /// Connect FTP The server /// </summary> /// <param name="FtpServerIP">FTP Connection address</param> /// <param name="FtpRemotePath">Appoint FTP Current directory after successful connection, Default to root if not specified</param> /// <param name="FtpUserID">User name</param> /// <param name="FtpPassword">Password</param> public FTPHelper(string FtpServerIP, string FtpRemotePath, string FtpUserID, string FtpPassword) { ftpServerIP = FtpServerIP; ftpRemotePath = FtpRemotePath; ftpUserID = FtpUserID; ftpPassword = FtpPassword; ftpURI = "ftp://" + ftpServerIP + "/" + ftpRemotePath + "/"; } /// <summary> /// upload /// </summary> public void Upload(string filename) { FileInfo fileInf = new FileInfo(filename); FtpWebRequest reqFTP; reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + fileInf.Name)); reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword); reqFTP.Method = WebRequestMethods.Ftp.UploadFile; reqFTP.KeepAlive = false; reqFTP.UseBinary = true; reqFTP.ContentLength = fileInf.Length; int buffLength = 2048; byte[] buff = new byte[buffLength]; int contentLen; FileStream fs = fileInf.OpenRead(); try { Stream strm = reqFTP.GetRequestStream(); contentLen = fs.Read(buff, 0, buffLength); while (contentLen != 0) { strm.Write(buff, 0, contentLen); contentLen = fs.Read(buff, 0, buffLength); } strm.Close(); fs.Close(); } catch (Exception ex) { throw new Exception(ex.Message); } } /// <summary> /// download /// </summary> public void Download(string filePath, string fileName) { try { FileStream outputStream = new FileStream(filePath + "\\" + fileName, FileMode.Create); FtpWebRequest reqFTP; reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + fileName)); reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword); reqFTP.Method = WebRequestMethods.Ftp.DownloadFile; reqFTP.UseBinary = true; FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse(); Stream ftpStream = response.GetResponseStream(); long cl = response.ContentLength; int bufferSize = 2048; int readCount; byte[] buffer = new byte[bufferSize]; readCount = ftpStream.Read(buffer, 0, bufferSize); while (readCount > 0) { outputStream.Write(buffer, 0, readCount); readCount = ftpStream.Read(buffer, 0, bufferSize); } ftpStream.Close(); outputStream.Close(); response.Close(); } catch (Exception ex) { throw new Exception(ex.Message); } } /// <summary> /// Delete files /// </summary> public void Delete(string fileName) { try { FtpWebRequest reqFTP; reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + fileName)); reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword); reqFTP.Method = WebRequestMethods.Ftp.DeleteFile; reqFTP.KeepAlive = false; string result = String.Empty; FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse(); long size = response.ContentLength; Stream datastream = response.GetResponseStream(); StreamReader sr = new StreamReader(datastream); result = sr.ReadToEnd(); sr.Close(); datastream.Close(); response.Close(); } catch (Exception ex) { throw new Exception(ex.Message); } } /// <summary> /// Get details under current directory(Include files and folders) /// </summary> public string[] GetFilesDetailList() { try { StringBuilder result = new StringBuilder(); FtpWebRequest ftp; ftp = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI)); ftp.Credentials = new NetworkCredential(ftpUserID, ftpPassword); ftp.Method = WebRequestMethods.Ftp.ListDirectoryDetails; WebResponse response = ftp.GetResponse(); StreamReader reader = new StreamReader(response.GetResponseStream()); string line = reader.ReadLine(); line = reader.ReadLine(); line = reader.ReadLine(); while (line != null) { result.Append(line); result.Append("\n"); line = reader.ReadLine(); } result.Remove(result.ToString().LastIndexOf("\n"), 1); reader.Close(); response.Close(); return result.ToString().Split('\n'); } catch (Exception ex) { throw new Exception(ex.Message); } } /// <summary> /// Obtain FTP File list(Include folder) /// </summary> private string[] GetAllList(string url) { List<string> list = new List<string>(); FtpWebRequest req = (FtpWebRequest)WebRequest.Create(new Uri(url)); req.Credentials = new NetworkCredential(ftpPassword, ftpPassword); req.Method = WebRequestMethods.Ftp.ListDirectory; req.UseBinary = true; req.UsePassive = true; try { using (FtpWebResponse res = (FtpWebResponse)req.GetResponse()) { using (StreamReader sr = new StreamReader(res.GetResponseStream())) { string s; while ((s = sr.ReadLine()) != null) { list.Add(s); } } } } catch (Exception ex) { throw (ex); } return list.ToArray(); } /// <summary> /// Get the list of files in the current directory(Exclude folders) /// </summary> public string[] GetFileList(string url) { StringBuilder result = new StringBuilder(); FtpWebRequest reqFTP; try { reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(url)); reqFTP.UseBinary = true; reqFTP.Credentials = new NetworkCredential(ftpPassword, ftpPassword); reqFTP.Method = WebRequestMethods.Ftp.ListDirectoryDetails; WebResponse response = reqFTP.GetResponse(); StreamReader reader = new StreamReader(response.GetResponseStream()); string line = reader.ReadLine(); while (line != null) { if (line.IndexOf("<DIR>") == -1) { result.Append(Regex.Match(line, @"[\S]+ [\S]+", RegexOptions.IgnoreCase).Value.Split(' ')[1]); result.Append("\n"); } line = reader.ReadLine(); } result.Remove(result.ToString().LastIndexOf('\n'), 1); reader.Close(); response.Close(); } catch (Exception ex) { throw (ex); } return result.ToString().Split('\n'); } /// <summary> /// Determine whether the specified file exists in the current directory /// </summary> /// <param name="RemoteFileName">Remote filename</param> public bool FileExist(string RemoteFileName) { string[] fileList = GetFileList("*.*"); foreach (string str in fileList) { if (str.Trim() == RemoteFileName.Trim()) { return true; } } return false; } /// <summary> /// create folder /// </summary> public void MakeDir(string dirName) { FtpWebRequest reqFTP; try { reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + dirName)); reqFTP.Method = WebRequestMethods.Ftp.MakeDirectory; reqFTP.UseBinary = true; reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword); FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse(); Stream ftpStream = response.GetResponseStream(); ftpStream.Close(); response.Close(); } catch (Exception ex) { } } /// <summary> /// Get the specified file size /// </summary> public long GetFileSize(string filename) { FtpWebRequest reqFTP; long fileSize = 0; try { reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + filename)); reqFTP.Method = WebRequestMethods.Ftp.GetFileSize; reqFTP.UseBinary = true; reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword); FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse(); Stream ftpStream = response.GetResponseStream(); fileSize = response.ContentLength; ftpStream.Close(); response.Close(); } catch (Exception ex) { } return fileSize; } /// <summary> /// Change file name /// </summary> public void ReName(string currentFilename, string newFilename) { FtpWebRequest reqFTP; try { reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + currentFilename)); reqFTP.Method = WebRequestMethods.Ftp.Rename; reqFTP.RenameTo = newFilename; reqFTP.UseBinary = true; reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword); FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse(); Stream ftpStream = response.GetResponseStream(); ftpStream.Close(); response.Close(); } catch (Exception ex) { } } /// <summary> /// move file /// </summary> public void MovieFile(string currentFilename, string newDirectory) { ReName(currentFilename, newDirectory); } /// <summary> /// Switch current directory /// </summary> /// <param name="IsRoot">true:Absolute path false:Relative path</param> public void GotoDirectory(string DirectoryName, bool IsRoot) { if (IsRoot) { ftpRemotePath = DirectoryName; } else { ftpRemotePath += DirectoryName + "/"; } ftpURI = "ftp://" + ftpServerIP + "/" + ftpRemotePath + "/"; } }
Note: This article is reproduced from C ා tool class: FTP operation assistant class ftphelper ා IT technology fun house.