C# FTP操作类（获取文件和文件夹列表）

一.如何获取某一目录下的文件和文件夹列表。

由于FtpWebRequest类只提供了WebRequestMethods.Ftp.ListDirectory方式和WebRequestMethods.Ftp.ListDirectoryDetails方式。这个方法获取到的是包含文件列表和文件夹列表的信息。并不是单单只包含某一类。为此我们需要分析获取信息的特点。分析发现，对于文件夹会有“<DIR>”这一项，而文件没有。所以我们可以根据这个来区分。一下分别是获取文件列表和文件夹列表的代码：

1.获取文件夹列表：

 /// <summary>
 /// 从ftp服务器上获得文件夹列表
 /// </summary>
 /// <param name="RequedstPath">服务器下的相对路径</param>
 /// <returns></returns>
 public static List<string> GetDirctory(string RequedstPath)
 {
     List<string> strs = new List<string>();
     try
     {
         string uri = path + RequedstPath;   //目标路径 path为服务器地址
         FtpWebRequest reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));
         // ftp用户名和密码
         reqFTP.Credentials = new NetworkCredential(username, password);
         reqFTP.Method = WebRequestMethods.Ftp.ListDirectoryDetails;
         WebResponse response = reqFTP.GetResponse();
         StreamReader reader = new StreamReader(response.GetResponseStream());//中文文件名

         string line = reader.ReadLine();
         while (line != null)
         {
             if (line.Contains("<DIR>"))
             {
                 string msg = line.Substring(line.LastIndexOf("<DIR>")+).Trim();
                 strs.Add(msg);
             }
             line = reader.ReadLine();
         }
         reader.Close();
         response.Close();
         return strs;
     }
     catch (Exception ex)
     {
         Console.WriteLine("获取目录出错：" + ex.Message);
     }
     return strs;
 }

2.获取文件列表

 /// <summary>
 /// 从ftp服务器上获得文件列表
 /// </summary>
 /// <param name="RequedstPath">服务器下的相对路径</param>
 /// <returns></returns>
 public static List<string> GetFile(string RequedstPath)
 {
     List<string> strs = new List<string>();
     try
     {
         string uri = path + RequedstPath;   //目标路径 path为服务器地址
         FtpWebRequest reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));
         // ftp用户名和密码
         reqFTP.Credentials = new NetworkCredential(username, password);
         reqFTP.Method = WebRequestMethods.Ftp.ListDirectoryDetails;
         WebResponse response = reqFTP.GetResponse();
         StreamReader reader = new StreamReader(response.GetResponseStream());//中文文件名

         string line = reader.ReadLine();
         while (line != null)
         {
             if (!line.Contains("<DIR>"))
             {
                 string msg = line.Substring().Trim();
                 strs.Add(msg);
             }
             line = reader.ReadLine();
         }
         reader.Close();
         response.Close();
         return strs;
     }
     catch (Exception ex)
     {
         Console.WriteLine("获取文件出错：" + ex.Message);
     }
     return strs;
 }

二.其他代码

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Net;
 using System.IO;
 using System.Threading;

 namespace FtpSyn
 {
     static public class FtpHelper
     {
         //基本设置
         static private string path = @"ftp://" + Helper.GetAppConfig("obj") + "/";    //目标路径
         static private string ftpip =Helper.GetAppConfig("obj");    //ftp IP地址
         static private string username = Helper.GetAppConfig("username");   //ftp用户名
         static private string password = Helper.GetAppConfig("password");   //ftp密码

         //获取ftp上面的文件和文件夹
         public static string[] GetFileList(string dir)
         {
             string[] downloadFiles;
             StringBuilder result = new StringBuilder();
             FtpWebRequest request;
             try
             {
                 request = (FtpWebRequest)FtpWebRequest.Create(new Uri(path));
                 request.UseBinary = true;
                 request.Credentials = new NetworkCredential(username, password);//设置用户名和密码
                 request.Method = WebRequestMethods.Ftp.ListDirectory;
                 request.UseBinary = true;

                 WebResponse response = request.GetResponse();
                 StreamReader reader = new StreamReader(response.GetResponseStream());

                 string line = reader.ReadLine();
                 while (line != null)
                 {
                     result.Append(line);
                     result.Append("\n");
                     Console.WriteLine(line);
                     line = reader.ReadLine();
                 }
                 // to remove the trailing '\n'
                 result.Remove(result.ToString().LastIndexOf('\n'), );
                 reader.Close();
                 response.Close();
                 return result.ToString().Split('\n');
             }
             catch (Exception ex)
             {
                 Console.WriteLine("获取ftp上面的文件和文件夹：" + ex.Message);
                 downloadFiles = null;
                 return downloadFiles;
             }
         }

         /// <summary>
         /// 获取文件大小
         /// </summary>
         /// <param name="file">ip服务器下的相对路径</param>
         /// <returns>文件大小</returns>
         public static int GetFileSize(string file)
         {
             StringBuilder result = new StringBuilder();
             FtpWebRequest request;
             try
             {
                 request = (FtpWebRequest)FtpWebRequest.Create(new Uri(path + file));
                 request.UseBinary = true;
                 request.Credentials = new NetworkCredential(username, password);//设置用户名和密码
                 request.Method = WebRequestMethods.Ftp.GetFileSize;

                 int dataLength = (int)request.GetResponse().ContentLength;

                 return dataLength;
             }
             catch (Exception ex)
             {
                 Console.WriteLine("获取文件大小出错：" + ex.Message);
                 return -;
             }
         }

         /// <summary>
         /// 文件上传
         /// </summary>
         /// <param name="filePath">原路径（绝对路径）包括文件名</param>
         /// <param name="objPath">目标文件夹：服务器下的相对路径 不填为根目录</param>
         public static void FileUpLoad(string filePath,string objPath="")
         {
             try
             {
                 string url = path;
                 if(objPath!="")
                     url += objPath + "/";
                 try
                 {

                     FtpWebRequest reqFTP = null;
                     //待上传的文件 （全路径）
                     try
                     {
                         FileInfo fileInfo = new FileInfo(filePath);
                         using (FileStream fs = fileInfo.OpenRead())
                         {
                             long length = fs.Length;
                             reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(url + fileInfo.Name));

                             //设置连接到FTP的帐号密码
                             reqFTP.Credentials = new NetworkCredential(username, password);
                             //设置请求完成后是否保持连接
                             reqFTP.KeepAlive = false;
                             //指定执行命令
                             reqFTP.Method = WebRequestMethods.Ftp.UploadFile;
                             //指定数据传输类型
                             reqFTP.UseBinary = true;

                             using (Stream stream = reqFTP.GetRequestStream())
                             {
                                 //设置缓冲大小
                                 int BufferLength = ;
                                 byte[] b = new byte[BufferLength];
                                 int i;
                                 while ((i = fs.Read(b, , BufferLength)) > )
                                 {
                                     stream.Write(b, , i);
                                 }
                                 Console.WriteLine("上传文件成功");
                             }
                         }
                     }
                     catch (Exception ex)
                     {
                         Console.WriteLine("上传文件失败错误为" + ex.Message);
                     }
                     finally
                     {

                     }
                 }
                 catch (Exception ex)
                 {
                     Console.WriteLine("上传文件失败错误为" + ex.Message);
                 }
                 finally
                 {

                 }
             }
             catch (Exception ex)
             {
                 Console.WriteLine("上传文件失败错误为" + ex.Message);
             }
         }

         /// <summary>
         /// 删除文件
         /// </summary>
         /// <param name="fileName">服务器下的相对路径 包括文件名</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));
                 // 指定数据传输类型
                 reqFTP.UseBinary = true;
                 // ftp用户名和密码
                 reqFTP.Credentials = new NetworkCredential(username, password);
                 // 默认为true，连接不会被关闭
                 // 在一个命令之后被执行
                 reqFTP.KeepAlive = false;
                 // 指定执行什么命令
                 reqFTP.Method = WebRequestMethods.Ftp.DeleteFile;
                 FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
                 response.Close();
             }
             catch (Exception ex)
             {
                 Console.WriteLine("删除文件出错：" + ex.Message);
             }
         }

         /// <summary>
         /// 新建目录 上一级必须先存在
         /// </summary>
         /// <param name="dirName">服务器下的相对路径</param>
         public static void MakeDir(string dirName)
         {
             try
             {
                 string uri = path + dirName;
                 FtpWebRequest reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));
                 // 指定数据传输类型
                 reqFTP.UseBinary = true;
                 // ftp用户名和密码
                 reqFTP.Credentials = new NetworkCredential(username, password);
                 reqFTP.Method = WebRequestMethods.Ftp.MakeDirectory;
                 FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
                 response.Close();
             }
             catch (Exception ex)
             {
                 Console.WriteLine("创建目录出错：" + ex.Message);
             }
         }

         /// <summary>
         /// 删除目录 上一级必须先存在
         /// </summary>
         /// <param name="dirName">服务器下的相对路径</param>
         public static void DelDir(string dirName)
         {
             try
             {
                 string uri = path + dirName;
                 FtpWebRequest reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));
                 // ftp用户名和密码
                 reqFTP.Credentials = new NetworkCredential(username, password);
                 reqFTP.Method = WebRequestMethods.Ftp.RemoveDirectory;
                 FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
                 response.Close();
             }
             catch (Exception ex)
             {
                 Console.WriteLine("删除目录出错：" + ex.Message);
             }
         }

         /// <summary>
         /// 从ftp服务器上获得文件夹列表
         /// </summary>
         /// <param name="RequedstPath">服务器下的相对路径</param>
         /// <returns></returns>
         public static List<string> GetDirctory(string RequedstPath)
         {
             List<string> strs = new List<string>();
             try
             {
                 string uri = path + RequedstPath;   //目标路径 path为服务器地址
                 FtpWebRequest reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));
                 // ftp用户名和密码
                 reqFTP.Credentials = new NetworkCredential(username, password);
                 reqFTP.Method = WebRequestMethods.Ftp.ListDirectoryDetails;
                 WebResponse response = reqFTP.GetResponse();
                 StreamReader reader = new StreamReader(response.GetResponseStream());//中文文件名

                 string line = reader.ReadLine();
                 while (line != null)
                 {
                     if (line.Contains("<DIR>"))
                     {
                         string msg = line.Substring(line.LastIndexOf("<DIR>")+).Trim();
                         strs.Add(msg);
                     }
                     line = reader.ReadLine();
                 }
                 reader.Close();
                 response.Close();
                 return strs;
             }
             catch (Exception ex)
             {
                 Console.WriteLine("获取目录出错：" + ex.Message);
             }
             return strs;
         }

         /// <summary>
         /// 从ftp服务器上获得文件列表
         /// </summary>
         /// <param name="RequedstPath">服务器下的相对路径</param>
         /// <returns></returns>
         public static List<string> GetFile(string RequedstPath)
         {
             List<string> strs = new List<string>();
             try
             {
                 string uri = path + RequedstPath;   //目标路径 path为服务器地址
                 FtpWebRequest reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));
                 // ftp用户名和密码
                 reqFTP.Credentials = new NetworkCredential(username, password);
                 reqFTP.Method = WebRequestMethods.Ftp.ListDirectoryDetails;
                 WebResponse response = reqFTP.GetResponse();
                 StreamReader reader = new StreamReader(response.GetResponseStream());//中文文件名

                 string line = reader.ReadLine();
                 while (line != null)
                 {
                     if (!line.Contains("<DIR>"))
                     {
                         string msg = line.Substring().Trim();
                         strs.Add(msg);
                     }
                     line = reader.ReadLine();
                 }
                 reader.Close();
                 response.Close();
                 return strs;
             }
             catch (Exception ex)
             {
                 Console.WriteLine("获取文件出错：" + ex.Message);
             }
             return strs;
         }

     }
 }

转自：http://www.cnblogs.com/rond/archive/2012/07/30/2611295.html