直接上代码如下：

using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.IO;
using System.Net;
using System.Text;
using System.Threading.Tasks;namespace ConsoleApp2
{class Program{static void Main(string[] args){Console.WriteLine("Hello World!");FtpHelper ftpHelper = new FtpHelper("xxxxx", "","Administrator","1qaz@qwer");string[] datas = ftpHelper.GetAllList(null);Console.WriteLine(JsonConvert.SerializeObject(datas));Console.ReadLine();} }public class FtpHelper{string ftpServerIP;string ftpRemotePath;string ftpUserID;string ftpPassword;string ftpURI;/// <summary>/// 连接FTP/// </summary>/// <param name="FtpServerIP">FTP连接地址</param>/// <param name="FtpRemotePath">指定FTP连接成功后的当前目录, 如果不指定即默认为根目录</param>/// <param name="FtpUserID">用户名</param>/// <param name="FtpPassword">密码</param>public FtpHelper(string FtpServerIP, string FtpRemotePath, string FtpUserID, string FtpPassword){ftpServerIP = FtpServerIP;ftpRemotePath = FtpRemotePath;ftpUserID = FtpUserID;ftpPassword = FtpPassword;if (string.IsNullOrEmpty(ftpRemotePath)){ftpURI = "ftp://" + ftpServerIP + "/";}else{ftpURI = "ftp://" + ftpServerIP + "/" + ftpRemotePath + "/";}}/// <summary>/// 下载/// </summary>/// <param name="filePath">下载保存的文件夹路径</param>/// <param name="fileName">文件名称</param>public bool Download(string filePath, string fileName){try{FileStream outputStream = new FileStream(filePath + "\\" + fileName, FileMode.Create);FtpWebRequest reqFTP;reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + fileName));reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;reqFTP.UseBinary = true;FtpWebResponse response = (FtpWebResponse)reqFTP.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);while (readCount > 0){outputStream.Write(buffer, 0, readCount);readCount = ftpStream.Read(buffer, 0, bufferSize);}ftpStream.Close();outputStream.Close();response.Close();return true;}catch (Exception ex){return false;}}/// <summary>/// 下载的异步方法/// </summary>/// <param name="filePath">下载保存的文件夹路径</param>/// <param name="fileName">文件名称</param>/// <returns></returns>public Task<bool> DownloadAsync(string filePath, string fileName){return Task.Run(() => { return Download(filePath, fileName); });}/// <summary>/// 获取文件名称/// </summary>/// <param name="url">为空则获取根目录下所有</param>/// <returns></returns>public string[] GetAllList(string url){List<string> list = new List<string>();FtpWebRequest req = (FtpWebRequest)WebRequest.Create(new Uri(ftpURI));req.Credentials = new NetworkCredential(ftpUserID, ftpPassword);req.Method = WebRequestMethods.Ftp.ListDirectory;req.UseBinary = true;req.UsePassive = true;try{using (FtpWebResponse res = (FtpWebResponse)req.GetResponse()){using (StreamReader sr = new StreamReader(res.GetResponseStream())){string s;while ((s = sr.ReadLine()) != null){list.Add(s);}}}}catch (Exception ex){Console.WriteLine(ex.StackTrace);}return list.ToArray();}/// <summary>  /// 获取当前目录下明细(包含文件和文件夹)  /// </summary>  public string[] GetFilesDetailList(){try{StringBuilder result = new StringBuilder();FtpWebRequest ftp;ftp = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI));ftp.Credentials = new NetworkCredential(ftpUserID, ftpPassword);ftp.Method = WebRequestMethods.Ftp.ListDirectoryDetails;WebResponse response = ftp.GetResponse();StreamReader reader = new StreamReader(response.GetResponseStream());string line = reader.ReadLine();line = reader.ReadLine();line = reader.ReadLine();while (line != null){result.Append(line);result.Append("\n");line = reader.ReadLine();}result.Remove(result.ToString().LastIndexOf("\n"), 1);reader.Close();response.Close();return result.ToString().Split('\n');}catch (Exception ex){throw new Exception(ex.Message);}}/// <summary>  /// 移动文件  /// </summary>  public void MovieFile(string currentFilename, string newDirectory){ReName(currentFilename, newDirectory);}/// <summary>  /// 更改文件名  /// </summary> public bool ReName(string currentFilename, string newFilename){FtpWebRequest reqFTP;try{reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + currentFilename));reqFTP.Method = WebRequestMethods.Ftp.Rename;reqFTP.RenameTo = newFilename;reqFTP.UseBinary = true;reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();Stream ftpStream = response.GetResponseStream();ftpStream.Close();response.Close();return true;}catch (Exception ex){return false;}}/// <summary>  /// 获取指定文件大小  /// </summary>  public long GetFileSize(string filename){FtpWebRequest reqFTP;long fileSize = 0;try{reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + filename));reqFTP.Method = WebRequestMethods.Ftp.GetFileSize;reqFTP.UseBinary = true;reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();Stream ftpStream = response.GetResponseStream();fileSize = response.ContentLength;ftpStream.Close();response.Close();}catch (Exception ex){}return fileSize;}/// <summary>  /// 创建文件夹  /// </summary>   public bool MakeDir(string dirName){FtpWebRequest reqFTP;try{reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + dirName));reqFTP.Method = WebRequestMethods.Ftp.MakeDirectory;reqFTP.UseBinary = true;reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();Stream ftpStream = response.GetResponseStream();ftpStream.Close();response.Close();return true;}catch (Exception ex){return false;}}/// <summary>  /// 删除文件  /// </summary>  public bool Delete(string fileName){try{FtpWebRequest reqFTP;reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + fileName));reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);reqFTP.Method = WebRequestMethods.Ftp.DeleteFile;reqFTP.KeepAlive = false;string result = String.Empty;FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();long size = response.ContentLength;Stream datastream = response.GetResponseStream();StreamReader sr = new StreamReader(datastream);result = sr.ReadToEnd();sr.Close();datastream.Close();response.Close();return true;}catch (Exception ex){return false;}}/// <summary>  /// 上传  /// </summary>   public bool Upload(string filename){FileInfo fileInf = new FileInfo(filename);FtpWebRequest reqFTP;reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + fileInf.Name));reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);reqFTP.Method = WebRequestMethods.Ftp.UploadFile;reqFTP.KeepAlive = false;reqFTP.UseBinary = true;reqFTP.ContentLength = fileInf.Length;int buffLength = 2048;byte[] buff = new byte[buffLength];int contentLen;FileStream fs = fileInf.OpenRead();try{Stream strm = reqFTP.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();return true;}catch (Exception ex){return false;}}/// <summary>/// 上传的异步方法/// </summary>/// <param name="filename"></param>/// <returns></returns>public Task<bool> UploadAsync(string filename){return Task.Run(() => { return Upload(filename); });}}
}