C# FTP操作类可用

 public class FtpClient
    {
        #region 构造函数
        /// <summary>
        /// 创建FTP工具
        /// <para>
        /// 默认不使用SSL,使用二进制传输方式,使用被动模式
        /// </para>
        /// </summary>
        /// <param name="host">主机名称</param>
        /// <param name="userId">用户名</param>
        /// <param name="password">密码</param>
        public FtpClient(string host, string userId, string password)
            : this(host, userId, password, 21, null, false, true, true)
        {
        }
        /// <summary>
        /// 创建FTP工具
        /// </summary>
        /// <param name="host">主机名称</param>
        /// <param name="userId">用户名</param>
        /// <param name="password">密码</param>
        /// <param name="port">端口</param>
        /// <param name="enableSsl">允许Ssl</param>
        /// <param name="proxy">代理</param>
        /// <param name="useBinary">允许二进制</param>
        /// <param name="usePassive">允许被动模式</param>
        public FtpClient(string host, string userId, string password, int port, IWebProxy proxy, bool enableSsl, bool useBinary, bool usePassive)
        {
            this.userId = userId;
            this.password = password;
            if (host.ToLower().StartsWith("ftp://"))
            {
                this.host = host;
            }
            else
            {
                this.host = "ftp://" + host;
            }
            this.port = port;
            this.proxy = proxy;
            this.enableSsl = enableSsl;
            this.useBinary = useBinary;
            this.usePassive = usePassive;
        }
        #endregion
        #region 主机
        private string host = string.Empty;
        /// <summary>
        /// 主机
        /// </summary>
        public string Host
        {
            get
            {
                return this.host ?? string.Empty;
            }
        }
        #endregion
        #region 登录用户名
        private string userId = string.Empty;
        /// <summary>
        /// 登录用户名
        /// </summary>
        public string UserId
        {
            get
            {
                return this.userId;
            }
        }
        #endregion
        #region 密码
        private string password = string.Empty;
        /// <summary>
        /// 密码
        /// </summary>
        public string Password
        {
            get
            {
                return this.password;
            }
        }
        #endregion
        #region 代理
        IWebProxy proxy = null;
        /// <summary>
        /// 代理
        /// </summary>
        public IWebProxy Proxy
        {
            get
            {
                return this.proxy;
            }
            set
            {
                this.proxy = value;
            }
        }
        #endregion
        #region 端口
        private int port = 21;
        /// <summary>
        /// 端口
        /// </summary>
        public int Port
        {
            get
            {
                return port;
            }
            set
            {
                this.port = value;
            }
        }
        #endregion
        #region 设置是否允许Ssl
        private bool enableSsl = false;
        /// <summary>
        /// EnableSsl
        /// </summary>
        public bool EnableSsl
        {
            get
            {
                return enableSsl;
            }
        }
        #endregion
        #region 使用被动模式
        private bool usePassive = true;
        /// <summary>
        /// 被动模式
        /// </summary>
        public bool UsePassive
        {
            get
            {
                return usePassive;
            }
            set
            {
                this.usePassive = value;
            }
        }
        #endregion
        #region 二进制方式
        private bool useBinary = true;
        /// <summary>
        /// 二进制方式
        /// </summary>
        public bool UseBinary
        {
            get
            {
                return useBinary;
            }
            set
            {
                this.useBinary = value;
            }
        }
        #endregion
        #region 远端路径
        private string remotePath = "/";
        /// <summary>
        /// 远端路径
        /// <para>
        ///     返回FTP服务器上的当前路径(可以是 / 或 /a/../ 的形式)
        /// </para>
        /// </summary>
        public string RemotePath
        {
            get
            {
                return remotePath;
            }
            set
            {
                string result = "/";
                if (!string.IsNullOrEmpty(value) && value != "/")
                {
                    result = "/" + value.TrimStart('/').TrimEnd('/') + "/";
                }
                this.remotePath = result;
            }
        }
        #endregion
        #region 创建一个FTP连接
        /// <summary>
        /// 创建一个FTP请求
        /// </summary>
        /// <param name="url">请求地址</param>
        /// <param name="method">请求方法</param>
        /// <returns>FTP请求</returns>
        private FtpWebRequest CreateRequest(string url, string method)
        {
            //建立连接
            FtpWebRequest request = (FtpWebRequest)WebRequest.Create(url);
            request.Credentials = new NetworkCredential(this.userId, this.password);
            request.Proxy = this.proxy;
            request.KeepAlive = false;//命令执行完毕之后关闭连接
            request.UseBinary = useBinary;
            request.UsePassive = usePassive;
            request.EnableSsl = enableSsl;
            request.Method = method;
            return request;
        }
        #endregion
        #region 上传一个文件到远端路径下
        /// <summary>
        /// 把文件上传到FTP服务器的RemotePath下
        /// </summary>
        /// <param name="localFile">本地文件信息</param>
        /// <param name="remoteFileName">要保存到FTP文件服务器上的名称</param>
        public bool Upload(FileInfo localFile, string remoteFileName)
        {
            bool result = false;
            if (localFile.Exists)
            {
                string url = Host.TrimEnd('/') + RemotePath + remoteFileName;
                FtpWebRequest request = CreateRequest(url, WebRequestMethods.Ftp.UploadFile);
                //上传数据
                using (Stream rs = request.GetRequestStream())
                using (FileStream fs = localFile.OpenRead())
                {
                    byte[] buffer = new byte[4096];//4K
                    int count = fs.Read(buffer, 0, buffer.Length);
                    while (count > 0)
                    {
                        rs.Write(buffer, 0, count);
                        count = fs.Read(buffer, 0, buffer.Length);
                    }
                    fs.Close();
                    result = true;
                }
                return result;
            }
            throw new Exception(string.Format("本地文件不存在,文件路径:{0}", localFile.FullName));
        }
        #endregion
        #region 从FTP服务器上下载文件
        /// <summary>
        /// 从当前目录下下载文件
        /// <para>
        /// 如果本地文件存在,则从本地文件结束的位置开始下载.
        /// </para>
        /// </summary>
        /// <param name="serverName">服务器上的文件名称</param>
        /// <param name="localName">本地文件名称</param>
        /// <returns>返回一个值,指示是否下载成功</returns>
        public bool Download(string serverName, string localName)
        {
            bool result = false;
            using (FileStream fs = new FileStream(localName, FileMode.OpenOrCreate)) //创建或打开本地文件
            {
                //建立连接
                string url = Host.TrimEnd('/') + RemotePath + serverName;
                FtpWebRequest request = CreateRequest(url, WebRequestMethods.Ftp.DownloadFile);
                request.ContentOffset = fs.Length;
                using (FtpWebResponse response = (FtpWebResponse)request.GetResponse())
                {
                    fs.Position = fs.Length;
                    byte[] buffer = new byte[4096];//4K
                    int count = response.GetResponseStream().Read(buffer, 0, buffer.Length);
                    while (count > 0)
                    {
                        fs.Write(buffer, 0, count);
                        count = response.GetResponseStream().Read(buffer, 0, buffer.Length);
                    }
                    response.GetResponseStream().Close();
                }
                result = true;
            }
            return result;
        }
        #endregion
        #region 重命名FTP服务器上的文件
        /// <summary>
        /// 文件更名
        /// </summary>
        /// <param name="oldFileName">原文件名</param>
        /// <param name="newFileName">新文件名</param>
        /// <returns>返回一个值,指示更名是否成功</returns>
        public bool Rename(string oldFileName, string newFileName)
        {
            bool result = false;
            //建立连接
            string url = Host.TrimEnd('/') + RemotePath + oldFileName;
            FtpWebRequest request = CreateRequest(url, WebRequestMethods.Ftp.Rename);
            request.RenameTo = newFileName;
            using (FtpWebResponse response = (FtpWebResponse)request.GetResponse())
            {
                result = true;
            }
            return result;
        }
        #endregion
        #region 从当前目录下获取文件列表
        /// <summary>
        /// 获取当前目录下文件列表
        /// </summary>
        /// <returns></returns>
        public List<string> GetFileList()
        {
            List<string> result = new List<string>();
            //建立连接
            string url = Host.TrimEnd('/') + RemotePath;
            FtpWebRequest request = CreateRequest(url, WebRequestMethods.Ftp.ListDirectory);
            using (FtpWebResponse response = (FtpWebResponse)request.GetResponse())
            {
                StreamReader reader = new StreamReader(response.GetResponseStream(), System.Text.Encoding.Default);//中文文件名
                string line = reader.ReadLine();
                while (line != null)
                {
                    result.Add(line);
                    line = reader.ReadLine();
                }
            }
            return result;
        }
        #endregion
        #region 从FTP服务器上获取文件和文件夹列表
        /// <summary>
        /// 获取详细列表 从FTP服务器上获取文件和文件夹列表
        /// </summary>
        /// <returns></returns>
        public List<string> GetFileDetails()
        {
            List<string> result = new List<string>();
            //建立连接
            string url = Host.TrimEnd('/') + RemotePath;
            FtpWebRequest request = CreateRequest(url, WebRequestMethods.Ftp.ListDirectoryDetails);
            using (FtpWebResponse response = (FtpWebResponse)request.GetResponse())
            {
                StreamReader reader = new StreamReader(response.GetResponseStream(), System.Text.Encoding.Default);//中文文件名
                string line = reader.ReadLine();
                while (line != null)
                {
                    result.Add(line);
                    line = reader.ReadLine();
                }
            }
            return result;
        }
        #endregion
        #region 从FTP服务器上删除文件
        /// <summary>
        /// 删除FTP服务器上的文件
        /// </summary>
        /// <param name="fileName">文件名称</param>
        /// <returns>返回一个值,指示是否删除成功</returns>
        public bool DeleteFile(string fileName)
        {
            bool result = false;
            //建立连接
            string url = Host.TrimEnd('/') + RemotePath + fileName;
            FtpWebRequest request = CreateRequest(url, WebRequestMethods.Ftp.DeleteFile);
            using (FtpWebResponse response = (FtpWebResponse)request.GetResponse())
            {
                result = true;
            }
            return result;
        }
        #endregion
        #region 在FTP服务器上创建目录
        /// <summary>
        /// 在当前目录下创建文件夹
        /// </summary>
        /// <param name="dirName">文件夹名称</param>
        /// <returns>返回一个值,指示是否创建成功</returns>
        public bool MakeDirectory(string dirName)
        {
            bool result = false;
            //建立连接
            string url = Host.TrimEnd('/') + RemotePath + dirName;
            FtpWebRequest request = CreateRequest(url, WebRequestMethods.Ftp.MakeDirectory);
            using (FtpWebResponse response = (FtpWebResponse)request.GetResponse())
            {
                result = true;
            }
            return result;
        }
        #endregion
        #region 从FTP服务器上删除目录
        /// <summary>
        /// 删除文件夹
        /// </summary>
        /// <param name="dirName">文件夹名称</param>
        /// <returns>返回一个值,指示是否删除成功</returns>
        public bool DeleteDirectory(string dirName)
        {
            bool result = false;
            //建立连接
            string url = Host.TrimEnd('/') + RemotePath + dirName;
            FtpWebRequest request = CreateRequest(url, WebRequestMethods.Ftp.RemoveDirectory);
            using (FtpWebResponse response = (FtpWebResponse)request.GetResponse())
            {
                result = true;
            }
            return result;
        }
        #endregion
        #region 从FTP服务器上获取文件大小
        /// <summary>
        /// 获取文件大小
        /// </summary>
        /// <param name="fileName"></param>
        /// <returns></returns>
        public long GetFileSize(string fileName)
        {
            long result = 0;
            //建立连接
            string url = Host.TrimEnd('/') + RemotePath + fileName;
            FtpWebRequest request = CreateRequest(url, WebRequestMethods.Ftp.GetFileSize);
            using (FtpWebResponse response = (FtpWebResponse)request.GetResponse())
            {
                result = response.ContentLength;
            }
            return result;
        }
        #endregion
        #region 给FTP服务器上的文件追加内容
        /// <summary>
        /// 给FTP服务器上的文件追加内容
        /// </summary>
        /// <param name="localFile">本地文件</param>
        /// <param name="remoteFileName">FTP服务器上的文件</param>
        /// <returns>返回一个值,指示是否追加成功</returns>
        public bool Append(FileInfo localFile, string remoteFileName)
        {
            if (localFile.Exists)
            {
                using (FileStream fs = new FileStream(localFile.FullName, FileMode.Open))
                {
                    return Append(fs, remoteFileName);
                }
            }
            throw new Exception(string.Format("本地文件不存在,文件路径:{0}", localFile.FullName));
        }
        /// <summary>
        /// 给FTP服务器上的文件追加内容
        /// </summary>
        /// <param name="stream">数据流(可通过设置偏移来实现从特定位置开始上传)</param>
        /// <param name="remoteFileName">FTP服务器上的文件</param>
        /// <returns>返回一个值,指示是否追加成功</returns>
        public bool Append(Stream stream, string remoteFileName)
        {
            bool result = false;
            if (stream != null && stream.CanRead)
            {
                //建立连接
                string url = Host.TrimEnd('/') + RemotePath + remoteFileName;
                FtpWebRequest request = CreateRequest(url, WebRequestMethods.Ftp.AppendFile);
                using (Stream rs = request.GetRequestStream())
                {
                    //上传数据
                    byte[] buffer = new byte[4096];//4K
                    int count = stream.Read(buffer, 0, buffer.Length);
                    while (count > 0)
                    {
                        rs.Write(buffer, 0, count);
                        count = stream.Read(buffer, 0, buffer.Length);
                    }
                    result = true;
                }
            }
            return result;
        }
        #endregion
        #region 获取FTP服务器上的当前路径
        /// <summary>
        /// 获取FTP服务器上的当前路径
        /// </summary>
        public string CurrentDirectory
        {
            get
            {
                string result = string.Empty;
                string url = Host.TrimEnd('/') + RemotePath;
                FtpWebRequest request = CreateRequest(url, WebRequestMethods.Ftp.PrintWorkingDirectory);
                using (FtpWebResponse response = (FtpWebResponse)request.GetResponse())
                {
                    string temp = response.StatusDescription;
                    int start = temp.IndexOf('"') + 1;
                    int end = temp.LastIndexOf('"');
                    if (end >= start)
                    {
                        result = temp.Substring(start, end - start);
                    }
                }
                return result;
            }
        }
        #endregion
        #region 检查当前路径上是否存在某个文件
        /// <summary>
        /// 检查文件是否存在
        /// </summary>
        /// <param name="fileName">要检查的文件名</param>
        /// <returns>返回一个值,指示要检查的文件是否存在</returns>
        public bool CheckFileExist(string fileName)
        {
            bool result = false;
            if (fileName != null && fileName.Trim().Length > 0)
            {
                fileName = fileName.Trim();
                List<string> files = GetFileList();
                if (files != null && files.Count > 0)
                {
                    foreach (string file in files)
                    {
                        if (file.ToLower() == fileName.ToLower())
                        {
                            result = true;
                            break;
                        }
                    }
                }
            }
            return result;
        }
        #endregion
    }