1.最近项目开发涉及到ftp操作。发现FtpWebRequest类有些操作很麻烦，

例如创建目录只能创建一级目录，多级就失败。删除目录只能删除最后一级的空目录。同样下载也是。

故写下帮助类方便使用。

2.调用方法展示，

var ftp = new FtpHelper("111.111.111.111", "xxxxxxx", "xxxxxx");//初始化ftp，创建ftp对象ftp.uploadFile("F:\\wms.zip","aaa//bbb");//参数1本地文件，参数2：ftp的目录ftp.delDirAll("aaa");//参数 要删除的目录的 路径ftp.downloadAllFile("aaa","F:\\myfile");//参数1:要下载的目录，参数2，保存到本地的目录

3.FtpHelper 代码。后续再补充说明

1.异常方法委托,通过Lamda委托统一处理异常，方便改写。加了个委托方便控制异常输出

2.递归查找所有目录存入list，然后根据 level排序，从最末级开始遍历删除

3.ftp的目录列表比较怪，暂时用截取字符串的获取 目录或文件

/// <summary>/// ftp帮助类/// </summary>public class FtpHelper{private string ftpHostIP { get; set; }private string username { get; set; }private string password { get; set; }private string ftpURI { get { return $@"ftp://{ftpHostIP}/"; } }/// <summary>/// 初始化ftp参数/// </summary>/// <param name="ftpHostIP">ftp主机IP</param>/// <param name="username">ftp账户</param>/// <param name="password">ftp密码</param>public FtpHelper(string ftpHostIP, string username, string password){this.ftpHostIP = ftpHostIP;this.username = username;this.password = password;}/// <summary>/// 异常方法委托,通过Lamda委托统一处理异常，方便改写/// </summary>/// <param name="method">当前执行的方法</param>/// <param name="action"></param>/// <returns></returns>private bool MethodInvoke(string method, Action action){if (action != null){try{action();//Logger.Write2File($@"FtpHelper.{method}:执行成功");FluentConsole.Red.Line($@"FtpHelper.{method}:执行成功");return true;}catch (Exception ex){FluentConsole.Red.Line($@"FtpHelper.{method}:执行失败", ex.ToString());// Logger.Write2File(action.GetType().Name, ex.ToString());return false;}}else{return false;}}/// <summary>/// 异常方法委托,通过Lamda委托统一处理异常，方便改写/// </summary>/// </summary>/// <typeparam name="T"></typeparam>/// <param name="method"></param>/// <param name="func"></param>/// <returns></returns>private T MethodInvoke<T>(string method, Func<T> func){if (func != null){try{FluentConsole.Red.Line($@"FtpHelper.{method}:执行成功");return func();//Logger.Write2File($@"FtpHelper.{method}:执行成功");}catch (Exception ex){FluentConsole.Red.Line($@"FtpHelper.{method}:执行失败:{ex}");// Logger.Write2File($@"FtpHelper.{method}:执行失败", ex.ToString());return default(T);}}else{return default(T);}}private FtpWebRequest GetRequest(string URI){//根据服务器信息FtpWebRequest创建类的对象FtpWebRequest result = (FtpWebRequest)WebRequest.Create(URI);result.Credentials = new NetworkCredential(username, password);result.KeepAlive = false;result.UsePassive = false;result.UseBinary = true;return result;}/// <summary> 上传文件</summary>/// <param name="filePath">需要上传的文件</param>/// <param name="targetDir">目标路径</param>public bool uploadFile(string filePath, string dirName = ""){FileInfo fileInfo = new FileInfo(filePath);if (dirName != "") makeDir(dirName);string uri = Path.Combine(ftpURI, dirName, fileInfo.Name);return MethodInvoke($@"uploadFile({filePath},{dirName})", () =>{FtpWebRequest ftp = GetRequest(uri);ftp.Method = WebRequestMethods.Ftp.UploadFile;ftp.ContentLength = fileInfo.Length;int buffLength = 2048;byte[] buff = new byte[buffLength];int contentLen;using (FileStream fs = fileInfo.OpenRead()){using (Stream strm = ftp.GetRequestStream()){contentLen = fs.Read(buff, 0, buffLength);while (contentLen != 0){strm.Write(buff, 0, contentLen);contentLen = fs.Read(buff, 0, buffLength);}strm.Close();}fs.Close();}});}/// <summary>/// 检查目录是否存在/// </summary>/// <param name="dirName"></param>/// <param name="currentDir"></param>/// <returns></returns>public bool checkDir(string dirName, string currentDir = ""){string uri = Path.Combine(ftpURI, currentDir);return MethodInvoke($@"checkDir({dirName}{currentDir})", () =>{FtpWebRequest ftp = GetRequest(uri);ftp.UseBinary = true;ftp.Method = WebRequestMethods.Ftp.ListDirectoryDetails;Stream stream = ftp.GetResponse().GetResponseStream();using (StreamReader sr = new StreamReader(stream)){string line = sr.ReadLine();while (!string.IsNullOrEmpty(line)){string dir = string.Empty;if (line.IndexOf("<DIR>") > -1){if (line.Substring(line.IndexOf("<DIR>") + 5).Trim() == dirName)return true;}line = sr.ReadLine();}sr.Close();}stream.Close();return false;});}/// <summary>/// 获取当前目录下的目录及文件/// </summary>/// param name="ftpfileList"></param>/// <param name="dirName"></param>/// <returns></returns>public List<Ftpfile> getFtpFile(string dirName){var ftpfileList = new List<Ftpfile>();string uri = Path.Combine(ftpURI, dirName);return MethodInvoke($@"getFile({dirName})", () =>{var a = new List<List<string>>();FtpWebRequest ftp = GetRequest(uri);ftp.Method = WebRequestMethods.Ftp.ListDirectoryDetails;Stream stream = ftp.GetResponse().GetResponseStream();using (StreamReader sr = new StreamReader(stream)){string line = sr.ReadLine();while (!string.IsNullOrEmpty(line)){ftpfileList.Add(new Ftpfile { isDir = line.IndexOf("<DIR>") > -1, name = line.Substring(39).Trim(),path= Path.Combine(dirName, line.Substring(39).Trim()) });line = sr.ReadLine();}sr.Close();}return ftpfileList;});}/// <summary>/// 获取目录下的所有目录及文件包括其子目录和子文件/// </summary>/// param name="ftpfileList"></param>/// <param name="dirName"></param>/// <returns></returns>public List<Ftpfile> getAllFtpFile(List<Ftpfile> ftpfileList, string dirName, int level = 0){var flist = new List<Ftpfile>();string uri = Path.Combine(ftpURI, dirName);return MethodInvoke($@"getFile({dirName})", () =>{var a = new List<List<string>>();FtpWebRequest ftp = GetRequest(uri);ftp.Method = WebRequestMethods.Ftp.ListDirectoryDetails;Stream stream = ftp.GetResponse().GetResponseStream();using (StreamReader sr = new StreamReader(stream)){string line = sr.ReadLine();while (!string.IsNullOrEmpty(line)){flist.Add(new Ftpfile { isDir = line.IndexOf("<DIR>") > -1, name = line.Substring(39).Trim(), level = level, path= Path.Combine(dirName ,line.Substring(39).Trim()) });ftpfileList.Add(new Ftpfile { isDir = line.IndexOf("<DIR>") > -1, name = line.Substring(39).Trim(), level = level, path = Path.Combine(dirName, line.Substring(39).Trim()) });line = sr.ReadLine();}sr.Close();}var nflist = flist.Where(x => x.isDir).ToList();if (nflist.Count == 0)return ftpfileList;elsereturn getAllFtpFile(ftpfileList, Path.Combine(dirName, nflist.First().name), level + 1);});}/// </summary>/// 在ftp服务器上创建指定目录,父目录不存在则创建/// </summary>/// <param name="dirName">创建的目录名称</param>public bool makeDir(string dirName){var dirs = dirName.Split('\\').ToList();//针对多级目录分割string currentDir = string.Empty;return MethodInvoke($@"makeDir({dirName})", () =>{foreach (var dir in dirs){if (!checkDir(dir, currentDir))//检查目录不存在则创建{currentDir = Path.Combine(currentDir, dir);string uri = Path.Combine(ftpURI, currentDir);FtpWebRequest ftp = GetRequest(uri);ftp.Method = WebRequestMethods.Ftp.MakeDirectory;FtpWebResponse response = (FtpWebResponse)ftp.GetResponse();response.Close();}else{currentDir = Path.Combine(currentDir, dir);}}});}/// <summary> /// 删除单个文件/// </summary>/// <param name="filePath"></param>public bool delFile(string filePath){string uri = Path.Combine(ftpURI, filePath);return MethodInvoke($@"deleteFile({filePath})", () =>{FtpWebRequest ftp = GetRequest(uri);ftp.Method = WebRequestMethods.Ftp.DeleteFile;FtpWebResponse response = (FtpWebResponse)ftp.GetResponse();response.Close();});}/// <summary> /// 删除最末及空目录/// </summary>/// <param name="dirName"></param>private bool delDir(string dirName){string uri = Path.Combine(ftpURI, dirName);return MethodInvoke($@"delDir({dirName})", () =>{FtpWebRequest ftp = GetRequest(uri);ftp.Method = WebRequestMethods.Ftp.RemoveDirectory;FtpWebResponse response = (FtpWebResponse)ftp.GetResponse();response.Close();});}/// <summary> 删除目录或者其目录下所有的文件 </summary>/// <param name="dirName">目录名称</param>/// <param name="ifDelSub">是否删除目录下所有的文件</param>public void delDirAll(string dirName){var dlist = getAllFtpFile(new List<Ftpfile>(),dirName);dlist.OrderByDescending(x => x.level);//降序排列，先删除末及文件或空目录string uri = Path.Combine(ftpURI, dirName);MethodInvoke($@"delDirAll({dirName})", () =>{foreach (var item in dlist){if (item.isDir)//判断是目录调用目录的删除方法delDir(item.path);elsedelFile(item.path);}});}/// <summary>文件重命名 </summary>/// <param name="currentFilename">当前名称</param>/// <param name="newFilename">重命名名称</param>/// <param name="currentFilename">所在的目录</param>public bool Rename(string currentFilename, string newFilename, string dirName = ""){string uri = Path.Combine(ftpURI, dirName, currentFilename);return MethodInvoke($@"Rename({currentFilename},{newFilename},{dirName})", () =>{FtpWebRequest ftp = GetRequest(uri);ftp.Method = WebRequestMethods.Ftp.Rename;ftp.RenameTo = newFilename;FtpWebResponse response = (FtpWebResponse)ftp.GetResponse();response.Close();});}/// <summary>/// 下载单个文件/// </summary>/// <param name="ftpFilePath">从ftp要下载的文件路径</param>/// <param name="localDir">下载至本地路径</param>/// <param name="filename">文件名</param>public bool downloadFile(string ftpFilePath, string saveDir, string filename){string tmpname = Guid.NewGuid().ToString();string uri = Path.Combine(ftpURI, ftpFilePath);return MethodInvoke($@"downloadFile({ftpFilePath},{saveDir},{filename})", () =>{if (!Directory.Exists(saveDir)) Directory.CreateDirectory(saveDir);FtpWebRequest ftp = GetRequest(uri);ftp.Method = WebRequestMethods.Ftp.DownloadFile;using (FtpWebResponse response = (FtpWebResponse)ftp.GetResponse()){using (Stream responseStream = response.GetResponseStream()){using (FileStream fs = new FileStream(Path.Combine(saveDir, filename), FileMode.CreateNew)){byte[] buffer = new byte[2048];int read = 0;do{read = responseStream.Read(buffer, 0, buffer.Length);fs.Write(buffer, 0, read);} while (!(read == 0));responseStream.Close();fs.Flush();fs.Close();}responseStream.Close();}response.Close();}});}/// <summary> /// 从FTP下载整个文件夹 /// </summary> /// <param name="dirName">FTP文件夹路径</param> /// <param name="saveDir">保存的本地文件夹路径</param> public void downloadAllFile(string dirName, string saveDir){MethodInvoke($@"downloadAllFile({dirName},{saveDir})", () =>{List<Ftpfile> files = getFtpFile(dirName);if (!Directory.Exists(saveDir)){Directory.CreateDirectory(saveDir);}foreach (var f in files){if (f.isDir) //文件夹，递归查询 {downloadAllFile(Path.Combine(dirName + f.name), Path.Combine(saveDir + f.name));}else //文件，直接下载 {downloadFile(Path.Combine(dirName + f.name), saveDir, f.name);}}});}}public class Ftpfile{public int level { get; set; } = 0;public bool isDir { get; set; }public string name { get; set; }public string path { get; set; } = "";}

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