如下代码是关于C# FTP操作类的代码。
using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.IO;

namespace Utility
{
public class FtpUpDown
{

string ftpServerIP;

string ftpUserID;

string ftpPassword;

FtpWebRequest reqFTP;

{

reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(path));

reqFTP.UseBinary = true;

reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);

}

public FtpUpDown(string ftpServerIP, string ftpUserID, string ftpPassword)
{
this.ftpServerIP = ftpServerIP;

this.ftpUserID = ftpUserID;

this.ftpPassword = ftpPassword;
}

{
string[] downloadFiles;
StringBuilder result = new StringBuilder();
try
{
Connect(path);

reqFTP.Method = WRMethods;

WebResponse response = reqFTP.GetResponse();

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)
{
Log.WriteError("Get FileList Error:" + ex.Message);
downloadFiles = null;

return downloadFiles;
}
}

{
}
{
}

{
FileInfo fileInf = new FileInfo(filename);

reqFTP.KeepAlive = false;

reqFTP.Method = WebRequestMethods.Ftp.UploadFile;

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)
{
Log.WriteError( "Upload Error:" + ex.Message);
}

}

{
try
{
String onlyFileName = Path.GetFileName(fileName);

string newFileName = filePath + "\" + onlyFileName;

if (File.Exists(newFileName))
{

errorinfo = string.Format("本地文件{0}已存在,无法下载", newFileName);
return false;
}
reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
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);

FileStream outputStream = new FileStream(newFileName, FileMode.Create);
while (readCount > 0)
{
outputStream.Write(buffer, 0, readCount);
readCount = ftpStream.Read(buffer, 0, bufferSize);
}
ftpStream.Close();
outputStream.Close();
response.Close();

errorinfo = "";

return true;

}

catch (Exception ex)
{
errorinfo = string.Format("因{0},无法下载", ex.Message);

return false;

}

}

public void DeleteFileName(string fileName)
{
try
{
FileInfo fileInf = new FileInfo(fileName);

reqFTP.KeepAlive = false;

reqFTP.Method = WebRequestMethods.Ftp.DeleteFile;

FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
response.Close();

}

catch (Exception ex)
{
Log.WriteError("删除错误:" + ex.Message);
}

}

public void MakeDir(string dirName)
{
try
{

reqFTP.Method = WebRequestMethods.Ftp.MakeDirectory;

FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();

response.Close();

}

catch (Exception ex)
{
Log.WriteError("创建目录错误:" + ex.Message);
}

}

public void delDir(string dirName)
{
try
{

reqFTP.Method = WebRequestMethods.Ftp.RemoveDirectory;

FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();

response.Close();

}

catch (Exception ex)
{
Log.WriteError("删除目录错误:" + ex.Message);
}

}

public long GetFileSize(string filename)
{

long fileSize = 0;

try
{

FileInfo fileInf = new FileInfo(filename);

reqFTP.Method = WebRequestMethods.Ftp.GetFileSize;

FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();

fileSize = response.ContentLength;

response.Close();

}

catch (Exception ex)
{
Log.WriteError("获得文件大小错误:" + ex.Message);
}

return fileSize;

}

public void Rename(string currentFilename, string newFilename)
{
try
{
FileInfo fileInf = new FileInfo(currentFilename);
reqFTP.Method = WebRequestMethods.Ftp.Rename;
reqFTP.RenameTo = newFilename;
FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
response.Close();

}

catch (Exception ex)
{
Log.WriteError("文件改名错误:" + ex.Message);
}

}

public Stream ReadFile(string fileName)
{
try
{
reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
Stream ftpStream = response.GetResponseStream();
return ftpStream;
}

catch (Exception ex)
{
Log.WriteError("读取文件错误:" + ex.Message);
return null;
}

}

public string[] GetFilesDetailList()
{

}

public string[] GetFilesDetailList(string path)
{

}

public bool fileCheckExist(string fileName)
{
bool success = false;
FtpWebResponse response = null;
StreamReader reader = null;
try
{
reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
response = (FtpWebResponse)reqFTP.GetResponse();
reader = new StreamReader(response.GetResponseStream());
string line = reader.ReadLine();
if (line != null)
{
success = true;
}
}
catch (Exception)
{
success = false;
}
finally
{
if (reader != null)
{
reader.Close();
}

if (response != null)
{
response.Close();
}
}
return success;
}
}
}