FTP上传、下载（简单小例子）

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Net;
 
namespace FTPConsoleApplication
{
    class Program
    {
        static void Main(string[] args)
        {
            //测试
            //DownloadFtp("优课.png");
            //UploadFtp("FTPConsoleApplication.exe.config");
            //SystemLog.logger("OK");
        }  
 
        public static FtpStatusCode UploadFileInFTP(string filename)
        {
            Stream requestStream = null;
            FileStream fileStream = null;
            FtpWebResponse uploadResponse = null;
            FtpWebRequest uploadRequest = null;
            string serverIP;
            string userName;
            string password;
            string uploadurl;  
 
            try
            {
                serverIP = System.Configuration.ConfigurationManager.AppSettings["FTPServerIP"];
                userName = System.Configuration.ConfigurationManager.AppSettings["UserName"];
                password = System.Configuration.ConfigurationManager.AppSettings["Password"];
                uploadurl = "ftp://" + serverIP + "/" + Path.GetFileName(filename);
                uploadRequest = (FtpWebRequest)WebRequest.Create(uploadurl);
                uploadRequest.Method = WebRequestMethods.Ftp.UploadFile;
                uploadRequest.Proxy = null;
                NetworkCredential nc = new NetworkCredential();
                nc.UserName = userName;
                nc.Password = password;
                uploadRequest.Credentials = nc;
                requestStream = uploadRequest.GetRequestStream();
                fileStream = File.Open(filename, FileMode.Open);  
 
                byte[] buffer = new byte[];
                int bytesRead;  
 
                while (true)
                {
                    bytesRead = fileStream.Read(buffer, , buffer.Length);
                    if (bytesRead == )
                    {
                        break;
                    }
                    requestStream.Write(buffer, , bytesRead);
                }  
 
                requestStream.Close();
                uploadResponse = (FtpWebResponse)uploadRequest.GetResponse();
                return uploadResponse.StatusCode;
            }
            catch (Exception e)
            {
                SystemLog.logger(e.InnerException.Message);
            }
            finally
            {
                if (uploadResponse != null)
                {
                    uploadResponse.Close();
                }
                if (fileStream != null)
                {
                    fileStream.Close();
                }
                if (requestStream != null)
                {
                    requestStream.Close();
                }  
 
            }
            return FtpStatusCode.Undefined;
        }  
 
        public static int UploadFtp(string filename)
        {
            FtpWebRequest reqFTP = null;
            string serverIP;
            string userName;
            string password;
            string url;  
 
            try
            {
                 FileInfo fileInf = new FileInfo(filename);
                 serverIP = System.Configuration.ConfigurationManager.AppSettings["FTPServerIP"];
                 userName = System.Configuration.ConfigurationManager.AppSettings["UserName"];
                 password = System.Configuration.ConfigurationManager.AppSettings["Password"];
                 url = "ftp://" + serverIP + "/" + Path.GetFileName(filename);  
 
                 reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(url));
                 reqFTP.Credentials = new NetworkCredential(userName, password);
                 reqFTP.KeepAlive = false;
                 reqFTP.Method = WebRequestMethods.Ftp.UploadFile;
                 reqFTP.UseBinary = true;
                 reqFTP.ContentLength = fileInf.Length;  
 
                 int buffLength = ;
                 byte[] buff = new byte[buffLength];
                 int contentLen;  
 
                 FileStream fs = fileInf.Open(FileMode.Open, FileAccess.Read, FileShare.ReadWrite);  
 
                 Stream strm = reqFTP.GetRequestStream();  
 
                 contentLen = fs.Read(buff, , buffLength);  
 
                 while (contentLen != )
                 {  
 
                     strm.Write(buff, , contentLen);
                     contentLen = fs.Read(buff, , buffLength);
                 }  
 
                 strm.Close();
                 fs.Close();
                 return ;
             }
             catch (Exception ex)
             {
                 if (reqFTP != null)
                 {
                     reqFTP.Abort();
                 }
                 SystemLog.logger(ex.InnerException.Message);
                 return -;
             }
         }  
 
         public static int DownloadFtp(string filename)
         {
             FtpWebRequest reqFTP;
             string serverIP;
             string userName;
             string password;
             string url;  
 
             try
             {
                 serverIP = System.Configuration.ConfigurationManager.AppSettings["FTPServerIP"];
                 userName = System.Configuration.ConfigurationManager.AppSettings["UserName"];
                 password = System.Configuration.ConfigurationManager.AppSettings["Password"];
                 url = "ftp://" + serverIP + "/" + Path.GetFileName(filename);  
 
                 FileStream outputStream = new FileStream(filename, FileMode.Create);
                 reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(url));
                 reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;
                 reqFTP.UseBinary = true;
                 reqFTP.KeepAlive = false;
                 reqFTP.Credentials = new NetworkCredential(userName, password);
                 FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
                 Stream ftpStream = response.GetResponseStream();
                 long cl = response.ContentLength;
                 int bufferSize = ;
                 int readCount;
                 byte[] buffer = new byte[bufferSize];
                 readCount = ftpStream.Read(buffer, , bufferSize);
                 while (readCount > )
                 {
                     outputStream.Write(buffer, , readCount);
                     readCount = ftpStream.Read(buffer, , bufferSize);
                 }
                 ftpStream.Close();
                 outputStream.Close();
                 response.Close();
                 return ;
             }
             catch (Exception ex)
             {
                 SystemLog.logger(ex.InnerException.Message);
                 return -;
             }
         }  
 
         public class SystemLog
         {  
 
             public static bool logger(string message)
             {
                 try
                 {
                     DateTime timeNow = DateTime.Now;
                     string logPath = System.Configuration.ConfigurationManager.AppSettings["LogPath"];
                     string logSwitch = System.Configuration.ConfigurationManager.AppSettings["LogSwitch"];
                     if (logSwitch == "")
                     {
                         string logFullPath = Path.Combine(System.Environment.CurrentDirectory,logPath);
                         DirectoryInfo dirInfo = new DirectoryInfo(logFullPath);
                         if (!dirInfo.Exists)
                         {
                             dirInfo.Create();
                         }
 
                         Encoding encoding = Encoding.GetEncoding("gb2312");
                         byte[] info = encoding.GetBytes("[ " + timeNow.ToString("yyyy-MM-dd HH:mm:ss") + " ] " + message + "\n"); //转换编码成字节串  
 
                         if (!logPath.EndsWith(Path.DirectorySeparatorChar.ToString()))
                         {
                             logPath = logPath + Path.DirectorySeparatorChar.ToString();
                         }  
 
                         using (FileStream fs = System.IO.File.Open(logPath + timeNow.ToString("yyyy_MM_dd") + ".txt", FileMode.Append, FileAccess.Write, FileShare.ReadWrite))
                         {
                             fs.Write(info, , info.Length);
                             //以ASCII方式编写
                             using (StreamWriter w = new StreamWriter(fs, Encoding.ASCII))
                             {
                                 w.Flush();
                                 w.Close();
                             }  
 
                             fs.Close();
                         }
                     }
                     return true;
                 }
                 catch (Exception e)
                 {
                     return false;
                 }
             }
         }  
 
     }  
 
}