"C #" Ftphelper An example of a read and write operation to a server file

This article is mainly for you to introduce the Ftphelper implementation of FTP server file read and write operations, with a certain reference value, interested in small partners can refer to

Using System; Using System.Collections.Generic; Using System.Linq; Using System.Text; Using System.Net; Using System.IO;  Using system.threading;using system.configuration; Namespace Ftpsyn {public class Ftphelper {//Basic settings Ftp://400:zoina2017@192.168.10.17/400backup static private string path = @ "ftp://" + configurationmanager.appsettings["Ftpserverip"].  ToString () + "/"; Destination path static private string Ftpip = configurationmanager.appsettings["Ftpserverip"].  ToString (); FTP IP address static private string username = configurationmanager.appsettings["FtpUserName"].  ToString (); FTP user name static private string password = configurationmanager.appsettings["FTPPassword"].  ToString ();       FTP Password//Get FTP above files and folders public static string[] Getfilelist (string dir) {string[] downloadfiles;       StringBuilder result = new StringBuilder ();       FtpWebRequest request;  try {request = (FtpWebRequest) ftpwebrequest.create (new Uri (path + dir));       Request.         Usebinary = true; Request. Credentials = new NetworkCredential (username, password);//set user name and password request.         Method = WebRequestMethods.Ftp.ListDirectory; Request.         Usebinary = true; Request. Usepassive = false;         Choose active or passive mode, this sentence should be added. Request.         KeepAlive = false;//Be sure to set this property, otherwise the exception occurs when multiple files are downloaded at once. WebResponse response = Request.         GetResponse (); StreamReader reader = new StreamReader (response.          GetResponseStream ()); String 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) {Loghelper.writeerrorlog ("Get FTP Files and folders above:" + ex.)         Message);         Downloadfiles = null;       return downloadfiles; }     }      <summary>////Retrieve the files from the FTP server and convert all the contents to a string return///</summary>//<param name= "FileName" ></param>//<param name= "dir" ></param>//<returns></returns> public Stati       C string Getfilestr (String fileName, string dir) {FtpWebRequest reqftp;         try {reqftp = (ftpwebrequest) ftpwebrequest.create (The new Uri (path + dir + "/" + FileName));         Reqftp.method = WebRequestMethods.Ftp.DownloadFile;         Reqftp.usebinary = true;         Reqftp.credentials = new NetworkCredential (username, password); Reqftp.usepassive = false;         Choose active or passive mode, this sentence should be added.         Reqftp.keepalive = false;//Be sure to set this property, otherwise the exception occurs when multiple files are downloaded at once.         FtpWebResponse response = (ftpwebresponse) reqftp.getresponse (); Stream FtpStream = Response.         GetResponseStream ();         StreamReader reader = new StreamReader (ftpstream); String filestr = reader.          ReadToEnd (); Reader.         Close (); FtpstreaM.close (); Response.         Close ();       return filestr; } catch (Exception ex) {Loghelper.writeerrorlog ("Get FTP file and read content failed:" + ex.         Message);       return null; }}///<summary>///Get file Size///</summary>//<param name= "file" relative path under &GT;IP server < /param>//<returns> file size </returns> public static int GetFileSize (string file) {Stringbu       Ilder result = new StringBuilder ();       FtpWebRequest request;         try {request = (FtpWebRequest) ftpwebrequest.create (new Uri (path + file)); Request.         Usebinary = true; Request. Credentials = new NetworkCredential (username, password);//set user name and password request.          Method = WebRequestMethods.Ftp.GetFileSize; int datalength = (int) request. GetResponse ().          ContentLength;       return datalength; } catch (Exception ex) {Console.WriteLine ("Get File Size error:" + ex.)         Message);       return-1;     }}///<summary>///File Upload///</summary>/<param name= "FilePath" > Original path (absolute path) including file name </p  aram>//<param name= "Objpath" > Destination folder: The relative path under the server is not filled with the root directory </param> public static void FileUpLoad (string         Filepath,string objpath= "") {try {string url = path;         if (objpath!= "") URL + = Objpath + "/";           try {ftpwebrequest reqftp = null;             File to be uploaded (full path) try {FileInfo FileInfo = new FileInfo (FilePath); using (FileStream fs = Fileinfo.openread ()) {Long length = fs.               Length;                Reqftp = (ftpwebrequest) ftpwebrequest.create (new Uri (URL + fileinfo.name));               Set the password for the account connected to ftp Reqftp.credentials = new NetworkCredential (username, password);               Sets whether to maintain a connection after the request is complete reqftp.keepalive = false; Specify execution Command Reqftp.method = webrequestmethods.ftP.uploadfile;                Specifies the data transfer type reqftp.usebinary = TRUE; using (Stream stream = Reqftp.getrequeststream ()) {//Set buffer size int Bufferlengt                 h = 5120;                 Byte[] B = new Byte[bufferlength];                 int i; while ((i = FS). Read (b, 0, bufferlength)) > 0) {stream.                 Write (b, 0, I);               } Console.WriteLine ("Upload file succeeded"); }}} catch (Exception ex) {Console.WriteLine ("The Upload file failed error is" + ex.)           Message); } finally {}} catch (Exception ex) {Console.WriteLine ( "Upload file failed error is" + ex.         Message); } finally {}} catch (Exception ex) {Console.WriteLine ("Upload file failed error =" + Ex.       Message); }}///<summary>//delete files//</summary>//<param name= relative path under "filename" > Server includes file name </param> public static void Deletefilename (string         FileName) {try {FileInfo fileinf = new FileInfo (Ftpip + "" + fileName);         String uri = path + fileName;         FtpWebRequest reqftp = (ftpwebrequest) ftpwebrequest.create (new Uri (URI));         Specifies the data transfer type reqftp.usebinary = TRUE;         FTP user name and password reqftp.credentials = new NetworkCredential (username, password);         The default is true, the connection is not closed//After a command is executed reqftp.keepalive = false;         Specifies what command to execute Reqftp.method = WebRequestMethods.Ftp.DeleteFile;         FtpWebResponse response = (ftpwebresponse) reqftp.getresponse (); Response.       Close (); } catch (Exception ex) {Console.WriteLine ("Error Deleting file:" + ex.)       Message); }}///<summary>///New directory must first exist///</summary>//<param name= "DirName" > Service Relative path under the device </param> public static void MakeDir (string dirName) {try {string uri = path + dirName;         FtpWebRequest reqftp = (ftpwebrequest) ftpwebrequest.create (new Uri (URI));         Specifies the data transfer type reqftp.usebinary = TRUE;         FTP user name and password reqftp.credentials = new NetworkCredential (username, password);         Reqftp.method = WebRequestMethods.Ftp.MakeDirectory;         FtpWebResponse response = (ftpwebresponse) reqftp.getresponse (); Response.       Close (); } catch (Exception ex) {Console.WriteLine ("Error creating directory:" + ex.)       Message); }}///<summary>///delete directory must first exist///</summary>//<param name= "DirName" > Service Relative path under the device </param> public static void Deldir (string dirName) {try {string uri = path + di         Rname;         FtpWebRequest reqftp = (ftpwebrequest) ftpwebrequest.create (new Uri (URI)); FTP user name and password reqftp.credentials = new NetworkCredential (username, PAssWOrd);         Reqftp.method = WebRequestMethods.Ftp.RemoveDirectory;         FtpWebResponse response = (ftpwebresponse) reqftp.getresponse (); Response.       Close (); } catch (Exception ex) {Console.WriteLine ("Error deleting directory:" + ex.)       Message); }}///<summary>///Get a list of folders from the FTP server///</summary>//<param name= "Requedstpath" Relative path under Server </param>///<returns></returns> public static list<string> getdirctory (String R       Equedstpath) {list<string> STRs = new list<string> ();  try {string uri = path + Requedstpath;         The destination path is the server address ftpwebrequest reqftp = (ftpwebrequest) ftpwebrequest.create (new Uri (URI));         FTP user name and password reqftp.credentials = new NetworkCredential (username, password);         Reqftp.method = WebRequestMethods.Ftp.ListDirectoryDetails;         WebResponse response = Reqftp.getresponse (); StreamReader reader = newStreamReader (response. GetResponseStream ());//Chinese file name string line = Reader.         ReadLine (); while (line! = null) {if (line. Contains ("<DIR>")) {string msg = line. Substring (line. LastIndexOf ("<DIR>") +5).             Trim (); STRs.           ADD (msg); } line = reader.         ReadLine (); } reader.         Close (); Response.         Close ();       return STRs; } catch (Exception ex) {Console.WriteLine ("Get directory Error:" + ex.)       Message);     } return STRs; }///<summary>///Get a list of files from the FTP server///</summary>//<param name= "Requedstpath" > Server phase On path </param>///<returns></returns> public static list<string> GetFile (String Requedstpath       ) {list<string> STRs = new list<string> ();  try {string uri = path + Requedstpath; The destination path is the server address ftpwebrequest reqftp = (ftpwebrequest) ftpwebrequest.         Create (new Uri (URI));         FTP user name and password reqftp.credentials = new NetworkCredential (username, password);         Reqftp.method = WebRequestMethods.Ftp.ListDirectoryDetails;         WebResponse response = Reqftp.getresponse (); StreamReader reader = new StreamReader (response. GetResponseStream ());//Chinese file name string line = Reader.         ReadLine (); while (line! = null) {if (!line. Contains ("<DIR>")) {string msg = line. Substring (39).             Trim (); STRs.           ADD (msg); } line = reader.         ReadLine (); } reader.         Close (); Response.         Close ();       return STRs; } catch (Exception ex) {Console.WriteLine ("Get File Error:" + ex.)       Message);     } return STRs; }      } }