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C# FTP操作（上传、下载等……）

作者：小小林熬夜学编程 | 2024-03-06 15:25:46

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c# ftp

因为工作中经常涉及到FTP文件的上传和下载，每次有这样的需求时都要重复编写相同的代码，后来干脆整理一个FTPClass，这样不仅方便自己使用，也可以共享给部门其它同事，使用时直接调用就可以了，节省了大家的开发时间。其实这个类网上有很多同样的写法，就算是给自己的博客凑篇文章吧。

目录

判断FTP连接

FTP文件上传

FTP文件下载

删除指定FTP文件

删除指定FTP文件夹

获取FTP上文件夹/文件列表

创建文件夹

获取指定FTP文件大小

更改指定FTP文件名称

移动指定FTP文件

应用示例

判断FTP连接

  1.         public bool CheckFtp()
  2.         {
  3.             try
  4.             {
  5.                 FtpWebRequest ftprequest = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI));
  6.                 // ftp用户名和密码
  7.                 ftprequest.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
  8.                 ftprequest.Method = WebRequestMethods.Ftp.ListDirectory;
  9.                 ftprequest.Timeout = 3000;
  10.                 FtpWebResponse ftpResponse = (FtpWebResponse)ftprequest.GetResponse();
  11.  
  12.                 ftpResponse.Close();
  13.                 return true;
  14.             }
  15.             catch (Exception ex)
  16.             {
  17.                 return false;
  18.             }
  19.         }

FTP文件上传

参数localfile为要上传的本地文件，ftpfile为上传到FTP的文件名称，ProgressBar为显示上传进度的滚动条，适用于WinForm。若应用于控制台程序，只要重写该函数，将参数ProgressBar去掉即可，同时将函数实现里所有涉及ProgressBar的地方都删掉。

  1.         public void Upload(string localfile, string ftpfile, System.Windows.Forms.ProgressBar pb)
  2.         {
  3.             FileInfo fileInf = new FileInfo(localfile);
  4.             FtpWebRequest reqFTP;
  5.             reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + ftpfile));
  6.             reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
  7.             reqFTP.Method = WebRequestMethods.Ftp.UploadFile;
  8.             reqFTP.KeepAlive = false;
  9.             reqFTP.UseBinary = true;
  10.             reqFTP.ContentLength = fileInf.Length;
  11.             if (pb != null)
  12.             {
  13.                 pb.Maximum = Convert.ToInt32(reqFTP.ContentLength / 2048);
  14.                 pb.Maximum = pb.Maximum + 1;
  15.                 pb.Minimum = 0;
  16.                 pb.Value = 0;
  17.             }
  18.             int buffLength = 2048;
  19.             byte[] buff = new byte[buffLength];
  20.             int contentLen;
  21.             FileStream fs = fileInf.OpenRead();
  22.             try
  23.             {
  24.                 Stream strm = reqFTP.GetRequestStream();
  25.                 contentLen = fs.Read(buff, 0, buffLength);
  26.                 while (contentLen != 0)
  27.                 {
  28.                     strm.Write(buff, 0, contentLen);
  29.                     if (pb != null)
  30.                     {
  31.                         if (pb.Value != pb.Maximum)
  32.                             pb.Value = pb.Value + 1;
  33.                     }
  34.                     contentLen = fs.Read(buff, 0, buffLength);
  35.                     System.Windows.Forms.Application.DoEvents();
  36.                 }
  37.                 if (pb != null)
  38.                     pb.Value = pb.Maximum;
  39.                 System.Windows.Forms.Application.DoEvents();
  40.                 strm.Close();
  41.                 fs.Close();
  42.             }
  43.             catch (Exception ex)
  44.             {
  45.                 throw new Exception(ex.Message);
  46.             }
  47.         }

FTP文件下载

参数localfilename为将下载到本地的文件名称，ftpfilename为要下载的FTP上文件名称，ProcessBar为用于显示下载进度的进度条。该函数用于WinForm，若用于控制台，只要重写该函数，删除所有涉及ProcessBar的代码即可。

  1.         public void Download(string localfilename, string ftpfileName, System.Windows.Forms.ProgressBar pb)
  2.         {
  3.             long fileSize = GetFileSize(ftpfileName);
  4.             if (fileSize > 0)
  5.             {
  6.                 if (pb != null)
  7.                 {
  8.                     pb.Maximum = Convert.ToInt32(fileSize / 2048);
  9.                     pb.Maximum = pb.Maximum + 1;
  10.                     pb.Minimum = 0;
  11.                     pb.Value = 0;
  12.                 }
  13.                 try
  14.                 {
  15.                     FileStream outputStream = new FileStream(localfilename, FileMode.Create);
  16.                     FtpWebRequest reqFTP;
  17.                     reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + ftpfileName));
  18.                     reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
  19.                     reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;
  20.                     reqFTP.UseBinary = true;
  21.                     FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
  22.                     Stream ftpStream = response.GetResponseStream();
  23.                     int bufferSize = 2048;
  24.                     
  25.                     int readCount;
  26.                     byte[] buffer = new byte[bufferSize];
  27.                     readCount = ftpStream.Read(buffer, 0, bufferSize);
  28.                     while (readCount > 0)
  29.                     {
  30.                         outputStream.Write(buffer, 0, readCount);
  31.                         if (pb != null)
  32.                         {
  33.                             if (pb.Value != pb.Maximum)
  34.                                 pb.Value = pb.Value + 1;
  35.                         }
  36.                         readCount = ftpStream.Read(buffer, 0, bufferSize);
  37.                         System.Windows.Forms.Application.DoEvents();
  38.                     }
  39.                     if (pb != null)
  40.                         pb.Value = pb.Maximum;
  41.                     System.Windows.Forms.Application.DoEvents();
  42.                     ftpStream.Close();
  43.                     outputStream.Close();
  44.                     response.Close();
  45.                 }
  46.                 catch (Exception ex)
  47.                 {
  48.                     File.Delete(localfilename);
  49.                     throw new Exception(ex.Message);
  50.                 }
  51.             }
  52.         }

删除指定FTP文件

  1.         public void Delete(string fileName)
  2.         {
  3.             try
  4.             {
  5.                 FtpWebRequest reqFTP;
  6.                 reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + fileName));
  7.                 reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
  8.                 reqFTP.Method = WebRequestMethods.Ftp.DeleteFile;
  9.                 reqFTP.KeepAlive = false;
  10.                 string result = String.Empty;
  11.                 FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
  12.                 long size = response.ContentLength;
  13.                 Stream datastream = response.GetResponseStream();
  14.                 StreamReader sr = new StreamReader(datastream);
  15.                 result = sr.ReadToEnd();
  16.                 sr.Close();
  17.                 datastream.Close();
  18.                 response.Close();
  19.             }
  20.             catch (Exception ex)
  21.             {
  22.                 throw new Exception(ex.Message);
  23.             }
  24.         }

删除指定FTP文件夹

  1.         public void RemoveDirectory(string urlpath)
  2.         {
  3.             try
  4.             {
  5.                 string uri = ftpURI + urlpath;
  6.                 FtpWebRequest reqFTP;
  7.                 reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));
  8.                 reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
  9.                 reqFTP.KeepAlive = false;
  10.                 reqFTP.Method = WebRequestMethods.Ftp.RemoveDirectory;
  11.                 string result = String.Empty;
  12.                 FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
  13.                 long size = response.ContentLength;
  14.                 Stream datastream = response.GetResponseStream();
  15.                 StreamReader sr = new StreamReader(datastream);
  16.                 result = sr.ReadToEnd();
  17.                 sr.Close();
  18.                 datastream.Close();
  19.                 response.Close();
  20.             }
  21.             catch (Exception ex)
  22.             {
  23.                 throw new Exception(ex.Message);
  24.             }
  25.         }

获取FTP上文件夹/文件列表

ListType=1代表获取文件列表，ListType=2代表获取文件夹列表，ListType=3代表获取文件和文件夹列表。
Detail=true时获文件或文件夹详细信息，Detail=false时只获取文件或文件夹名称。
Keyword是只需list名称包含Keyword的文件或文件夹，若要list所有文件或文件夹，则该参数为空。若ListType=3，则该参数无效。

  1.         public List<string> GetFileDirctoryList(int ListType, bool Detail, string Keyword)
  2.         {
  3.             List<string> strs = new List<string>();
  4.             try
  5.             {
  6.                 FtpWebRequest reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI));
  7.                 // ftp用户名和密码
  8.                 reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
  9.                 if (Detail)
  10.                     reqFTP.Method = WebRequestMethods.Ftp.ListDirectoryDetails;
  11.                 else
  12.                     reqFTP.Method = WebRequestMethods.Ftp.ListDirectory;
  13.                 WebResponse response = reqFTP.GetResponse();
  14.                 StreamReader reader = new StreamReader(response.GetResponseStream());//中文文件名
  15.                 string line = reader.ReadLine();
  16.                 while (line != null)
  17.                 {
  18.                     if (ListType == 1)
  19.                     {
  20.                         if (line.Contains("."))
  21.                         {
  22.                             if (Keyword.Trim() == "*.*" || Keyword.Trim() == "")
  23.                             {
  24.                                 strs.Add(line);
  25.                             }
  26.                             else if (line.IndexOf(Keyword.Trim()) > -1)
  27.                             {
  28.                                 strs.Add(line);
  29.                             }
  30.                         }
  31.                     }
  32.                     else if (ListType == 2)
  33.                     {
  34.                         if (!line.Contains("."))
  35.                         {
  36.                             if (Keyword.Trim() == "*" || Keyword.Trim() == "")
  37.                             {
  38.                                 strs.Add(line);
  39.                             }
  40.                             else if (line.IndexOf(Keyword.Trim()) > -1)
  41.                             {
  42.                                 strs.Add(line);
  43.                             }
  44.                         }
  45.                     }
  46.                     else if (ListType == 3)
  47.                     {
  48.                         strs.Add(line);
  49.                     }
  50.                     line = reader.ReadLine();
  51.                 }
  52.                 reader.Close();
  53.                 response.Close();
  54.                 return strs;
  55.             }
  56.             catch (Exception ex)
  57.             {
  58.                 throw new Exception(ex.Message);
  59.             }
  60.         }

创建文件夹

  1.         public void MakeDir(string dirName)
  2.         {
  3.             FtpWebRequest reqFTP;
  4.             try
  5.             {
  6.                 reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + dirName));
  7.                 reqFTP.Method = WebRequestMethods.Ftp.MakeDirectory;
  8.                 reqFTP.UseBinary = true;
  9.                 reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
  10.                 FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
  11.                 Stream ftpStream = response.GetResponseStream();
  12.                 ftpStream.Close();
  13.                 response.Close();
  14.             }
  15.             catch (Exception ex)
  16.             {
  17.                 throw new Exception(ex.Message);
  18.             }
  19.         }

获取指定FTP文件大小

  1.         public long GetFileSize(string ftpfileName)
  2.         {
  3.             long fileSize = 0;
  4.             try
  5.             {
  6.                 FtpWebRequest reqFTP;
  7.                 reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + ftpfileName));
  8.                 reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
  9.                 reqFTP.Method = WebRequestMethods.Ftp.GetFileSize;
  10.                 reqFTP.UseBinary = true;
  11.                 FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
  12.                 Stream ftpStream = response.GetResponseStream();
  13.                 fileSize = response.ContentLength;
  14.                 ftpStream.Close();
  15.                 response.Close();
  16.             }
  17.             catch (Exception ex)
  18.             {
  19.                 throw new Exception(ex.Message);
  20.             }
  21.             return fileSize;
  22.         }

更改指定FTP文件名称

  1.         public void ReName(string currentFilename, string newFilename)
  2.         {
  3.             FtpWebRequest reqFTP;
  4.             try
  5.             {
  6.                 reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + currentFilename));
  7.                 reqFTP.Method = WebRequestMethods.Ftp.Rename;
  8.                 reqFTP.RenameTo = newFilename;
  9.                 reqFTP.UseBinary = true;
  10.                 reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
  11.                 FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
  12.                 Stream ftpStream = response.GetResponseStream();
  13.                 ftpStream.Close();
  14.                 response.Close();
  15.             }
  16.             catch (Exception ex)
  17.             {
  18.                 throw new Exception(ex.Message);
  19.             }
  20.         }

移动指定FTP文件

移动FTP文件其实就是重命名文件，只要将目标文件指定一个新的FTP地址就可以了。我没用过，不知道是否可行，因为C++是这么操作的。

  1.         public void MovieFile(string currentFilename, string newDirectory)
  2.         {
  3.             ReName(currentFilename, newDirectory);
  4.         }

应用示例

将上面的内容打包到下面这个FTP类中，就可以在你的业务代码中调用了。

  1. using System;
  2. using System.IO;
  3. using System.Net;
  4. using System.Collections.Generic;
  5.  
  6. namespace TECSharpFunction
  7. {
  8.     /// <summary>
  9.     /// FTP操作
  10.     /// </summary>
  11.     public class FTPHelper
  12.     {
  13.         #region FTPConfig
  14.         string ftpURI;
  15.         string ftpUserID;
  16.         string ftpServerIP;
  17.         string ftpPassword;
  18.         string ftpRemotePath;
  19.         #endregion
  20.  
  21.         /// <summary>  
  22.         /// 连接FTP服务器
  23.         /// </summary>  
  24.         /// <param name="FtpServerIP">FTP连接地址</param>  
  25.         /// <param name="FtpRemotePath">指定FTP连接成功后的当前目录, 如果不指定即默认为根目录</param>  
  26.         /// <param name="FtpUserID">用户名</param>  
  27.         /// <param name="FtpPassword">密码</param>  
  28.         public FTPHelper(string FtpServerIP, string FtpRemotePath, string FtpUserID, string FtpPassword)
  29.         {
  30.             ftpServerIP = FtpServerIP;
  31.             ftpRemotePath = FtpRemotePath;
  32.             ftpUserID = FtpUserID;
  33.             ftpPassword = FtpPassword;
  34.             ftpURI = "ftp://" + ftpServerIP + "/" + ftpRemotePath + "/";
  35.         }
  36.  
  37.         //把上面介绍的那些方法都放到下面
  38.  
  39.     }
  40. }

举个例子：

  1. using System;
  2. using System.IO;
  3. using System.Net;
  4. using System.Collections.Generic;
  5. uusing TECSharpFunction;
  6.  
  7. namespace FTPTest
  8. {
  9.     public partial class Form1 : Form
  10.     {
  11.         public Form1()
  12.         {
  13.             InitializeComponent();
  14.         }
  15.         
  16.         Public void FTP_Test()
  17.         {
  18.             FTPHelper ftpClient = new FTPHelper("192.168.1.1",@"/test","Test","Test");
  19.             ftpClient.Download("test.txt", "test1.txt", progressBar1);
  20.         }
  21.     }
  22. }

好了，就这样吧！

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