C# ftp 文件增删改查、移动操作

using System;
using System.Collections.Generic;
using System.Data.OleDb;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Windows.Forms;

namespace GateProject
{
    public class FtpUpDown
    {
        private string strFtpServerIP;

        private string strFtpUserId;

        private string strFtpPassword;

        private string strFtpPort="21";

        private FtpWebRequest objReqFtp = null;

        /// <summary>
        /// 连接ftp
        /// </summary>
        /// <param name="path"></param>
        private void Connect(String path)
        {

            // 根据uri创建FtpWebRequest对象
            objReqFtp = (FtpWebRequest)FtpWebRequest.Create(new Uri(path));

            // 指定数据传输类型
            //To transmit text data, change the UseBinary property from its default value ( true) to false.
            objReqFtp.UseBinary = true;

            // specifies that an SSL connection
            objReqFtp.EnableSsl = false;

            // ftp用户名和密码
            objReqFtp.Credentials = new NetworkCredential(strFtpUserId, strFtpPassword);

        }

        /// <summary>
        /// 初始化
        /// </summary>
        /// <param name="strFtpServerIp"></param>
        /// <param name="strFtpUserId"></param>
        /// <param name="strFtpPassword"></param>
        public FtpUpDown()
        {

            try
            {
                //获取ftp服务器连接凭证
                //此处省略一些代码 66                 this.strFtpServerIP = Credentials[0];
                this.strFtpUserId = Credentials[1];
                this.strFtpPassword = Credentials[2];
 75             }
            catch (Exception ee)
            {
                MessageBox.Show("连接ftp服务器失败!/r/n"+ee.Message, "提示", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            
        }
        
        /// <summary>
        /// 从ftp服务器上获得文件列表
        /// </summary>
        /// <param name="path"></param>
        /// <param name="WRMethods"></param>
        /// <returns></returns>
        private string[] GetFileList(string path, string WRMethods)
        {
            string[] downloadFiles;
            StringBuilder result = new StringBuilder();
            Encoding pEncoding = Encoding.Default;
            try
            {
                Connect(path);

                objReqFtp.Method = WRMethods;

                WebResponse response = objReqFtp.GetResponse();

                StreamReader readStream;

                pEncoding = GetEncodingEncode(response);

                readStream = new StreamReader(response.GetResponseStream(), pEncoding);//中文文件名
                //readStream = new StreamReader(response.GetResponseStream(), System.Text.Encoding.UTF8);
                string line = readStream.ReadLine();

                while (line != null)
                {
                    result.Append(line);

                    result.Append("
");

                    line = readStream.ReadLine();

                }

                // to remove the trailing '
'

                result.Remove(result.ToString().LastIndexOf('
'), 1);

                readStream.Close();

                response.Close();

                objReqFtp = null;

                return result.ToString().Split('
');

            }

            catch (Exception ex)

            {
                MessageBox.Show(ex.Message);

                downloadFiles = null;

                return downloadFiles;
            }
        }
        /// <summary>
        /// 获取编码方式
        /// </summary>
        /// <param name="response"></param>
        /// <returns></returns>
        private static Encoding GetEncodingEncode(WebResponse response)
        {
            Encoding encodingTemp=Encoding.Default;

            StreamReader reader = new StreamReader(response.GetResponseStream());

            encodingTemp = reader.CurrentEncoding;

            if (encodingTemp == Encoding.UTF8)
            {
                encodingTemp = Encoding.UTF8;
            }
            else if(encodingTemp == Encoding.Default)
            {
                encodingTemp = Encoding.GetEncoding("GB2312");
            }
            else
            {
                
            }

            return encodingTemp;
        }

        /// <summary>
        /// 从ftp服务器上获得特定路径中文件列表
        /// </summary>
        /// <param name="path"></param>
        /// <returns></returns>
        public string[] GetFileList(string path)
        {
            return GetFileList("ftp://" + strFtpServerIP + "/" + path, WebRequestMethods.Ftp.ListDirectory);
        }

        /// <summary>
        /// 获取ftp服务器文件列表
        /// </summary>
        /// <returns></returns>
        public string[] GetFileList()
        {
            return GetFileList("ftp://" + strFtpServerIP + "/", WebRequestMethods.Ftp.ListDirectory);
        }

        /// <summary>
        /// 向ftp服务器上载文件
        /// </summary>
        /// <param name="filename">文件名</param>
        /// <param name="targetPath">目标文件上载路径，不含IP地址</param>
        public void Upload(string filename,string targetPath)
        {
            FileInfo fileInf = new FileInfo(filename);

            string uri = "ftp://" + strFtpServerIP + ":" + strFtpPort + "/" + targetPath ;

            Connect(uri);//连接        

            // 默认为true，连接不会被关闭

            // 在一个命令之后被执行

            objReqFtp.KeepAlive = false;

            // 指定执行什么命令

            objReqFtp.Method = WebRequestMethods.Ftp.UploadFile;

            // 上传文件时通知服务器文件的大小

            objReqFtp.ContentLength = fileInf.Length;
            // 缓冲大小设置为kb 
            int buffLength = 2048;
            byte[] buff = new byte[buffLength];

            int contentLen;

            // 打开一个文件流(System.IO.FileStream) 去读上传的文件

            FileStream fs = fileInf.OpenRead();

            try

            {

                // 把上传的文件写入流
                Stream strm = objReqFtp.GetRequestStream();

                // 每次读文件流的kb
                contentLen = fs.Read(buff, 0, buffLength);

                // 流内容没有结束
                while (contentLen != 0)
                {
                    // 把内容从file stream 写入upload stream 
                    strm.Write(buff, 0, contentLen);
                    contentLen = fs.Read(buff, 0, buffLength);

                }

                // 关闭两个流
                strm.Close();
                fs.Close();
                objReqFtp = null;

            }
            catch (Exception ex)
            {

                MessageBox.Show(ex.Message, "Upload Error");

            }

        }

        /// <summary>
        /// 从ftp服务器下载文件
        /// </summary>
        /// <param name="filePath"></param>
        /// <param name="fileName"></param>
        /// <param name="errorinfo"></param>
        /// <returns></returns>
        public bool Download(string filePath, string fileName, out string errorinfo)
        {
            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;
                }
                string url = "ftp://" + strFtpServerIP + ":" + strFtpPort + fileName;
                Connect(url);//连接 
                objReqFtp.Credentials = new NetworkCredential(strFtpUserId, strFtpPassword);
                FtpWebResponse response = (FtpWebResponse)objReqFtp.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();

                objReqFtp = null;
                errorinfo = outputStream.Name;
                return true;

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

        }

        /// <summary>
        /// 检测目录是否存在
        /// </summary> 
        /// <param name="ftpFilePath"></param>
        /// <returns>false不存在，true存在</returns>
        public bool DirectoryIsExist(string ftpFilePath)
        {
            WebResponse webResponse=null;
            StreamReader reader=null;
            try
            {
                int s = ftpFilePath.LastIndexOf('/');
                if (s == ftpFilePath.Length - 1)
                {
                    ftpFilePath = ftpFilePath.Substring(0, ftpFilePath.Length - 1);
                              s = ftpFilePath.LastIndexOf('/');
                }
                string ftpFileName = ftpFilePath.Substring(s + 1, ftpFilePath.Length - s - 1);
                string uri = GetFtpUri(ftpFilePath.Substring(0, s + 1));

                Connect(uri);

                objReqFtp.Method = WebRequestMethods.Ftp.ListDirectory;
                objReqFtp.UsePassive = false;
                objReqFtp.KeepAlive = false;

                webResponse = objReqFtp.GetResponse();
                reader = new StreamReader(webResponse.GetResponseStream());
                string line = reader.ReadLine();
                while (line != null)
                {
                    if (line == ftpFileName)
                    {
                        return true;
                    }
                    line = reader.ReadLine();
                }
            }
            catch (Exception e)
            {
                return false; 
            }
            finally
            {
                if (reader != null)
                {
                    reader.Close();
                }
                if (webResponse != null)
                {
                    webResponse.Close();
                }

                objReqFtp = null;
            }
            return false;
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="substring"></param>
        /// <returns></returns>
        private string GetFtpUri(string substring)
        {
            string uri = "ftp://" + strFtpServerIP + ":" + strFtpPort + "/" + substring;
             return uri;
        }


        /// <summary>
        /// 删除文件
        /// </summary>
        /// <param name="fileName"></param>
        public bool DeleteFileName(string fileName)
        {
            try
            {
                FileInfo fileInf = new FileInfo(fileName);

                string uri = "ftp://" + strFtpServerIP + ":" + strFtpPort + fileName;

                Connect(uri);//连接        

                // 默认为true，连接不会被关闭

                // 在一个命令之后被执行

                objReqFtp.KeepAlive = false;

                // 指定执行什么命令

                objReqFtp.Method = WebRequestMethods.Ftp.DeleteFile;

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

                bool success = response.StatusCode == FtpStatusCode.CommandOK || response.StatusCode == FtpStatusCode.FileActionOK;

                response.Close();

                objReqFtp = null;

                return success;

            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "删除错误");
                return false;
            }

        }
        
        /// <summary>
        /// 创建目录
        /// </summary>
        /// <param name="dirName">目录名称，不包括IP</param>
        public void MakeDir(string dirName)
        {
            try
            {
                string uri = "ftp://" + strFtpServerIP + "/" + dirName;

                Connect(uri);//连接

                objReqFtp.Method = WebRequestMethods.Ftp.MakeDirectory;

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

                response.Close();

                objReqFtp = null;

            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }

        }
        
        /// <summary>
        /// 删除目录
        /// </summary>
        /// <param name="dirName"></param>
        public void DelDir(string dirName)
        {
            try
            {
                string uri = "ftp://" + strFtpServerIP +":"+strFtpPort + dirName;

                Connect(uri);//连接     

                objReqFtp.Method = WebRequestMethods.Ftp.RemoveDirectory;

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

                response.Close();

                objReqFtp = null;

            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }

        }
        
        /// <summary>
        /// 获得文件大小
        /// </summary>
        /// <param name="filename"></param>
        /// <returns></returns>
        public long GetFileSize(string filename)
        {
            long fileSize = 0;
            try
            {
                FileInfo fileInf = new FileInfo(filename);

                string uri = "ftp://" + strFtpServerIP + "/" + fileInf.Name;

                Connect(uri);//连接     

                objReqFtp.Method = WebRequestMethods.Ftp.GetFileSize;

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

                fileSize = response.ContentLength;

                response.Close();

                objReqFtp = null;
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }

            return fileSize;

        }
        
        /// <summary>
        /// 文件重命名,包括ftp服务器内移动，但目标目录若已有同名文件，则会发生错误，原文件会被删除
        /// 524         /// </summary>
        /// <param name="currentFilename">当前目录[不含IP]</param>
        /// <param name="newFilename">新目录[不含IP]</param>
        public bool Rename(string currentFilename, string newFilename)
        {
            try
            {
                FileInfo fileInf = new FileInfo(currentFilename);

                string uri = "ftp://" + strFtpServerIP + ":" + strFtpPort + currentFilename;

                Connect(uri);//连接

                objReqFtp.Method = System.Net.WebRequestMethods.Ftp.Rename;
                //Wr.RenameTo = "/"+"someotherDirectory" + "/" +"file.txt";
                objReqFtp.RenameTo = newFilename;

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

                Stream ftpStream = response.GetResponseStream();

                if (ftpStream != null) ftpStream.Close();
                
                bool success = response.StatusCode == FtpStatusCode.CommandOK || response.StatusCode == FtpStatusCode.FileActionOK;
                
                response.Close();

                objReqFtp = null;

                return success;
            }

            catch (Exception ex)

            {

                MessageBox.Show(ex.Message);
                return false;

            }

        }
        
        /// <summary>
        /// 获得文件明细
        /// </summary>
        /// <returns></returns>
        public string[] GetFilesDetailList()
        {
            return GetFileList("ftp://" + strFtpServerIP + "/", WebRequestMethods.Ftp.ListDirectoryDetails);
        }

        /// <summary>
        /// 获得特定路径下的文件明细
        /// </summary>
        /// <param name="path"></param>
        /// <returns></returns>
        public string[] GetFilesDetailList(string path)
        {
            return GetFileList("ftp://" + strFtpServerIP + "/" + path, WebRequestMethods.Ftp.ListDirectoryDetails);
        }

    }
}



    

参考了如下网站内容并做了相应修改和完善

http://zhufangzeng.blog.163.com/blog/static/249191412010668453343/

https://social.msdn.microsoft.com/Forums/en-US/fc669934-d6d2-4815-b1ea-9a06006f05b7/moving-a-file-from-one-folder-to-another-ftp?forum=netfxnetcom&prof=required