using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Net;

using System.IO;

namespace JianKunKing.Common.Ftp

{

    /// <summary>

    /// ftp方式文件下载上传

    /// </summary>

    public static class FileUpDownload

    {

        #region 变量属性

        /// <summary>

        /// Ftp服务器ip

        /// </summary>

        public static string FtpServerIP = string.Empty;

        /// <summary>

        /// Ftp 指定用户名

        /// </summary>

        public static string FtpUserID = string.Empty;

        /// <summary>

        /// Ftp 指定用户密码

        /// </summary>

        public static string FtpPassword = string.Empty;

        #endregion

        #region 从FTP服务器下载文件，指定本地路径和本地文件名

        /// <summary>

        /// 从FTP服务器下载文件，指定本地路径和本地文件名

        /// </summary>

        /// <param name="remoteFileName">远程文件名</param>

        /// <param name="localFileName">保存本地的文件名（包含路径）</param>

        /// <param name="ifCredential">是否启用身份验证（false：表示允许用户匿名下载）</param>

        /// <param name="updateProgress">报告进度的处理(第一个参数：总大小，第二个参数：当前进度)</param>

        /// <returns>是否下载成功</returns>

        public static bool FtpDownload(string remoteFileName, string localFileName, bool ifCredential, Action<int, int> updateProgress = null)

        {

            FtpWebRequest reqFTP, ftpsize;

            Stream ftpStream = null;

            FtpWebResponse response = null;

            FileStream outputStream = null;

            try

            {

                outputStream = new FileStream(localFileName, FileMode.Create);

                if (FtpServerIP == null || FtpServerIP.Trim().Length == 0)

                {

                    throw new Exception("ftp下载目标服务器地址未设置！");

                }

                Uri uri = new Uri("ftp://" + FtpServerIP + "/" + remoteFileName);

                ftpsize = (FtpWebRequest)FtpWebRequest.Create(uri);

                ftpsize.UseBinary = true;

                reqFTP = (FtpWebRequest)FtpWebRequest.Create(uri);

                reqFTP.UseBinary = true;

                reqFTP.KeepAlive = false;

                if (ifCredential)//使用用户身份认证

                {

                    ftpsize.Credentials = new NetworkCredential(FtpUserID, FtpPassword);

                    reqFTP.Credentials = new NetworkCredential(FtpUserID, FtpPassword);

                }

                ftpsize.Method = WebRequestMethods.Ftp.GetFileSize;

                FtpWebResponse re = (FtpWebResponse)ftpsize.GetResponse();

                long totalBytes = re.ContentLength;

                re.Close();

                reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;

                response = (FtpWebResponse)reqFTP.GetResponse();

                ftpStream = response.GetResponseStream();

                //更新进度

                if (updateProgress != null)

                {

                    updateProgress((int)totalBytes, 0);//更新进度条

                }

                long totalDownloadedByte = 0;

                int bufferSize = 2048;

                int readCount;

                byte[] buffer = new byte[bufferSize];

                readCount = ftpStream.Read(buffer, 0, bufferSize);

                while (readCount > 0)

                {

                    totalDownloadedByte = readCount + totalDownloadedByte;

                    outputStream.Write(buffer, 0, readCount);

                    //更新进度

                    if (updateProgress != null)

                    {

                        updateProgress((int)totalBytes, (int)totalDownloadedByte);//更新进度条

                    }

                    readCount = ftpStream.Read(buffer, 0, bufferSize);

                }

                ftpStream.Close();

                outputStream.Close();

                response.Close();

                return true;

            }

            catch (Exception)

            {

                return false;

                throw;

            }

            finally

            {

                if (ftpStream != null)

                {

                    ftpStream.Close();

                }

                if (outputStream != null)

                {

                    outputStream.Close();

                }

                if (response != null)

                {

                    response.Close();

                }

            }

        }

        /// <summary>

        /// 从FTP服务器下载文件，指定本地路径和本地文件名（支持断点下载）

        /// </summary>

        /// <param name="remoteFileName">远程文件名</param>

        /// <param name="localFileName">保存本地的文件名（包含路径）</param>

        /// <param name="ifCredential">是否启用身份验证（false：表示允许用户匿名下载）</param>

        /// <param name="size">已下载文件流大小</param>

        /// <param name="updateProgress">报告进度的处理(第一个参数：总大小，第二个参数：当前进度)</param>

        /// <returns>是否下载成功</returns>

        public static bool FtpBrokenDownload(string remoteFileName, string localFileName, bool ifCredential, long size, Action<int, int> updateProgress = null)

        {

            FtpWebRequest reqFTP, ftpsize;

            Stream ftpStream = null;

            FtpWebResponse response = null;

            FileStream outputStream = null;

            try

            {

                outputStream = new FileStream(localFileName, FileMode.Append);

                if (FtpServerIP == null || FtpServerIP.Trim().Length == 0)

                {

                    throw new Exception("ftp下载目标服务器地址未设置！");

                }

                Uri uri = new Uri("ftp://" + FtpServerIP + "/" + remoteFileName);

                ftpsize = (FtpWebRequest)FtpWebRequest.Create(uri);

                ftpsize.UseBinary = true;

                ftpsize.ContentOffset = size;

                reqFTP = (FtpWebRequest)FtpWebRequest.Create(uri);

                reqFTP.UseBinary = true;

                reqFTP.KeepAlive = false;

                reqFTP.ContentOffset = size;

                if (ifCredential)//使用用户身份认证

                {

                    ftpsize.Credentials = new NetworkCredential(FtpUserID, FtpPassword);

                    reqFTP.Credentials = new NetworkCredential(FtpUserID, FtpPassword);

                }

                ftpsize.Method = WebRequestMethods.Ftp.GetFileSize;

                FtpWebResponse re = (FtpWebResponse)ftpsize.GetResponse();

                long totalBytes = re.ContentLength;

                re.Close();

                reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;

                response = (FtpWebResponse)reqFTP.GetResponse();

                ftpStream = response.GetResponseStream();

                //更新进度

                if (updateProgress != null)

                {

                    updateProgress((int)totalBytes, 0);//更新进度条

                }

                long totalDownloadedByte = 0;

                int bufferSize = 2048;

                int readCount;

                byte[] buffer = new byte[bufferSize];

                readCount = ftpStream.Read(buffer, 0, bufferSize);

                while (readCount > 0)

                {

                    totalDownloadedByte = readCount + totalDownloadedByte;

                    outputStream.Write(buffer, 0, readCount);

                    //更新进度

                    if (updateProgress != null)

                    {

                        updateProgress((int)totalBytes, (int)totalDownloadedByte);//更新进度条

                    }

                    readCount = ftpStream.Read(buffer, 0, bufferSize);

                }

                ftpStream.Close();

                outputStream.Close();

                response.Close();

                return true;

            }

            catch (Exception)

            {

                return false;

                throw;

            }

            finally

            {

                if (ftpStream != null)

                {

                    ftpStream.Close();

                }

                if (outputStream != null)

                {

                    outputStream.Close();

                }

                if (response != null)

                {

                    response.Close();

                }

            }

        }

        /// <summary>

        /// 从FTP服务器下载文件，指定本地路径和本地文件名

        /// </summary>

        /// <param name="remoteFileName">远程文件名</param>

        /// <param name="localFileName">保存本地的文件名（包含路径）</param>

        /// <param name="ifCredential">是否启用身份验证（false：表示允许用户匿名下载）</param>

        /// <param name="updateProgress">报告进度的处理(第一个参数：总大小，第二个参数：当前进度)</param>

        /// <param name="brokenOpen">是否断点下载：true 会在localFileName 找是否存在已经下载的文件，并计算文件流大小</param>

        /// <returns>是否下载成功</returns>

        public static bool FtpDownload(string remoteFileName, string localFileName, bool ifCredential, bool brokenOpen, Action<int, int> updateProgress = null)

        {

            if (brokenOpen)

            {

                try

                {

                    long size = 0;

                    if (File.Exists(localFileName))

                    {

                        using (FileStream outputStream = new FileStream(localFileName, FileMode.Open))

                        {

                            size = outputStream.Length;

                        }

                    }

                    return FtpBrokenDownload(remoteFileName, localFileName, ifCredential, size, updateProgress);

                }

                catch

                {

                    throw;

                }

            }

            else

            {

                return FtpDownload(remoteFileName, localFileName, ifCredential, updateProgress);

            }

        }

        #endregion

        #region 上传文件到FTP服务器

        /// <summary>

        /// 上传文件到FTP服务器

        /// </summary>

        /// <param name="localFullPath">本地带有完整路径的文件名</param>

        /// <param name="updateProgress">报告进度的处理(第一个参数：总大小，第二个参数：当前进度)</param>

        /// <returns>是否下载成功</returns>

        public static bool FtpUploadFile(string localFullPathName, Action<int, int> updateProgress = null)

        {

            FtpWebRequest reqFTP;

            Stream stream = null;

            FtpWebResponse response = null;

            FileStream fs = null;

            try

            {

                FileInfo finfo = new FileInfo(localFullPathName);

                if (FtpServerIP == null || FtpServerIP.Trim().Length == 0)

                {

                    throw new Exception("ftp上传目标服务器地址未设置！");

                }

                Uri uri = new Uri("ftp://" + FtpServerIP + "/" + finfo.Name);

                reqFTP = (FtpWebRequest)FtpWebRequest.Create(uri);

                reqFTP.KeepAlive = false;

                reqFTP.UseBinary = true;

                reqFTP.Credentials = new NetworkCredential(FtpUserID, FtpPassword);//用户，密码

                reqFTP.Method = WebRequestMethods.Ftp.UploadFile;//向服务器发出下载请求命令

                reqFTP.ContentLength = finfo.Length;//为request指定上传文件的大小

                response = reqFTP.GetResponse() as FtpWebResponse;

                reqFTP.ContentLength = finfo.Length;

                int buffLength = 1024;

                byte[] buff = new byte[buffLength];

                int contentLen;

                fs = finfo.OpenRead();

                stream = reqFTP.GetRequestStream();

                contentLen = fs.Read(buff, 0, buffLength);

                int allbye = (int)finfo.Length;

                //更新进度

                if (updateProgress != null)

                {

                    updateProgress((int)allbye, 0);//更新进度条

                }

                int startbye = 0;

                while (contentLen != 0)

                {

                    startbye = contentLen + startbye;

                    stream.Write(buff, 0, contentLen);

                    //更新进度

                    if (updateProgress != null)

                    {

                        updateProgress((int)allbye, (int)startbye);//更新进度条

                    }

                    contentLen = fs.Read(buff, 0, buffLength);

                }

                stream.Close();

                fs.Close();

                response.Close();

                return true;

            }

            catch (Exception)

            {

                return false;

                throw;

            }

            finally

            {

                if (fs != null)

                {

                    fs.Close();

                }

                if (stream != null)

                {

                    stream.Close();

                }

                if (response != null)

                {

                    response.Close();

                }

            }

        }

        /// <summary>

        /// 上传文件到FTP服务器(断点续传)

        /// </summary>

        /// <param name="localFullPath">本地文件全路径名称：C:\Users\JianKunKing\Desktop\IronPython脚本测试工具</param>

        /// <param name="remoteFilepath">远程文件所在文件夹路径</param>

        /// <param name="updateProgress">报告进度的处理(第一个参数：总大小，第二个参数：当前进度)</param>

        /// <returns></returns>

        public static bool FtpUploadBroken(string localFullPath, string remoteFilepath, Action<int, int> updateProgress = null)

        {

            if (remoteFilepath == null)

            {

                remoteFilepath = "";

            }

            string newFileName = string.Empty;

            bool success = true;

            FileInfo fileInf = new FileInfo(localFullPath);

            long allbye = (long)fileInf.Length;

            if (fileInf.Name.IndexOf("#") == -1)

            {

                newFileName = RemoveSpaces(fileInf.Name);

            }

            else

            {

                newFileName = fileInf.Name.Replace("#", "＃");

                newFileName = RemoveSpaces(newFileName);

            }

            long startfilesize = GetFileSize(newFileName, remoteFilepath);

            if (startfilesize >= allbye)

            {

                return false;

            }

            long startbye = startfilesize;

            //更新进度

            if (updateProgress != null)

            {

                updateProgress((int)allbye, (int)startfilesize);//更新进度条

            }

            string uri;

            if (remoteFilepath.Length == 0)

            {

                uri = "ftp://" + FtpServerIP + "/" + newFileName;

            }

            else

            {

                uri = "ftp://" + FtpServerIP + "/" + remoteFilepath + "/" + newFileName;

            }

            FtpWebRequest reqFTP;

            // 根据uri创建FtpWebRequest对象

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

            // ftp用户名和密码

            reqFTP.Credentials = new NetworkCredential(FtpUserID, FtpPassword);

            // 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.AppendFile;

            // 指定数据传输类型

            reqFTP.UseBinary = true;

            // 上传文件时通知服务器文件的大小

            reqFTP.ContentLength = fileInf.Length;

            int buffLength = 2048;// 缓冲大小设置为2kb

            byte[] buff = new byte[buffLength];

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

            FileStream fs = fileInf.OpenRead();

            Stream strm = null;

            try

            {

                // 把上传的文件写入流

                strm = reqFTP.GetRequestStream();

                // 每次读文件流的2kb

                fs.Seek(startfilesize, 0);

                int 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);

                    startbye += contentLen;

                    //更新进度

                    if (updateProgress != null)

                    {

                        updateProgress((int)allbye, (int)startbye);//更新进度条

                    }

                }

                // 关闭两个流

                strm.Close();

                fs.Close();

            }

            catch

            {

                success = false;

                throw;

            }

            finally

            {

                if (fs != null)

                {

                    fs.Close();

                }

                if (strm != null)

                {

                    strm.Close();

                }

            }

            return success;

        }

        /// <summary>

        /// 去除空格

        /// </summary>

        /// <param name="str"></param>

        /// <returns></returns>

        private static string RemoveSpaces(string str)

        {

            string a = "";

            CharEnumerator CEnumerator = str.GetEnumerator();

            while (CEnumerator.MoveNext())

            {

                byte[] array = new byte[1];

                array = System.Text.Encoding.ASCII.GetBytes(CEnumerator.Current.ToString());

                int asciicode = (short)(array[0]);

                if (asciicode != 32)

                {

                    a += CEnumerator.Current.ToString();

                }

            }

            string sdate = System.DateTime.Now.Year.ToString() + System.DateTime.Now.Month.ToString() + System.DateTime.Now.Day.ToString() + System.DateTime.Now.Hour.ToString()

                + System.DateTime.Now.Minute.ToString() + System.DateTime.Now.Second.ToString() + System.DateTime.Now.Millisecond.ToString();

            return a.Split('.')[a.Split('.').Length - 2] + "." + a.Split('.')[a.Split('.').Length - 1];

        }

        /// <summary>

        /// 获取已上传文件大小

        /// </summary>

        /// <param name="filename">文件名称</param>

        /// <param name="path">服务器文件路径</param>

        /// <returns></returns>

        public static long GetFileSize(string filename, string remoteFilepath)

        {

            long filesize = 0;

            try

            {

                FtpWebRequest reqFTP;

                FileInfo fi = new FileInfo(filename);

                string uri;

                if (remoteFilepath.Length == 0)

                {

                    uri = "ftp://" + FtpServerIP + "/" + fi.Name;

                }

                else

                {

                    uri = "ftp://" + FtpServerIP + "/" + remoteFilepath + "/" + fi.Name;

                }

                reqFTP = (FtpWebRequest)FtpWebRequest.Create(uri);

                reqFTP.KeepAlive = false;

                reqFTP.UseBinary = true;

                reqFTP.Credentials = new NetworkCredential(FtpUserID, FtpPassword);//用户，密码

                reqFTP.Method = WebRequestMethods.Ftp.GetFileSize;

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

                filesize = response.ContentLength;

                return filesize;

            }

            catch

            {

                return 0;

            }

        }

        //public void Connect(String path, string ftpUserID, string ftpPassword)//连接ftp

        //{

        //    // 根据uri创建FtpWebRequest对象

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

        //    // 指定数据传输类型

        //    reqFTP.UseBinary = true;

        //    // ftp用户名和密码

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

        //}

        #endregion

    }

}

调用实例：

下载（不需要带iis部分的路径）：

 FileUpDownload.FtpServerIP = "192.168.1.1";

            FileUpDownload.FtpUserID = "ftpTest001";

            FileUpDownload.FtpPassword = "aaaaaa";

            FileUpDownload.FtpDownload("Beyond Compare（绿色免安装）.zip",

                Application.StartupPath + "/downloads/crm2.ra6", false);

之前的上传的文件目录：

上传（不需要带iis部分的路径）：

OpenFileDialog op = new OpenFileDialog();

            op.InitialDirectory = Application.StartupPath;

            op.RestoreDirectory = true;

            op.Filter = "压缩文件(*.zip)|*.zip|压缩文件(*.rar)|*.rar|所有文件(*.*)|*.*";

            if (op.ShowDialog() == DialogResult.OK)

            {

                string aa = op.FileName;

                FileUpDownload.FtpServerIP = "192.168.1.1";

                FileUpDownload.FtpUserID = "ftpTest001";

                FileUpDownload.FtpPassword = "aaaaaa";

                //全路径

                FileUpDownload.FtpUploadFile(aa);

            }

IIS下搭建FTP服务器：点击打开链接