C#实现FTP客户端的案例

概述本文是利用C#实现FTP客户端的小例子，主要实现上传，下载，删除等功能，以供学习分享使用。

本文是利用C# 实现FTP客户端的小例子，主要实现上传，下载，删除等功能，以供学习分享使用。

思路：

通过读取FTP站点的目录信息，列出对应的文件及文件夹。
双击目录，则显示子目录，如果是文件，则点击右键，进行下载和删除 *** 作。
通过读取本地电脑的目录，以树状结构展示，选择本地文件，右键进行上传 *** 作。

涉及知识点：

FtpWebRequest【实现文件传输协议 (FTP) 客户端】 / FtpWebResponse【封装文件传输协议 (FTP) 服务器对请求的响应】Ftp的 *** 作主要集中在两个类中。
FlowLayoutPanel  【流布局面板】表示一个沿水平或垂直方向动态排放其内容的面板。
ContextMenuStrip 【快捷菜单】 主要用于右键菜单。
资源文件：Resources 用于存放图片及其他资源。

效果图如下

左边：双击文件夹进入子目录，点击工具栏按钮‘上级目录'返回。文件点击右键进行 *** 作。

右边：文件夹则点击前面+号展开。文件则点击右键进行上传。

核心代码如下

using System;using System.Collections.Generic;using System.IO;using System.linq;using System.Net;using System.Text;using System.Threading;using System.Threading.Tasks;namespace FtpClIEnt{  public class FtpHelper  {    #region 属性与构造函数    /// <summary>    /// IP地址    /// </summary>    public string IpAddr { get; set; }    /// <summary>    /// 相对路径    /// </summary>    public string RelatePath { get; set; }    /// <summary>    /// 端口号    /// </summary>    public string Port { get; set; }    /// <summary>    /// 用户名    /// </summary>    public string Username { get; set; }    /// <summary>    /// 密码    /// </summary>    public string Password { get; set; }        public FtpHelper() {    }    public FtpHelper(string ipAddr,string port,string username,string password) {      this.IpAddr = ipAddr;      this.Port = port;      this.Username = username;      this.Password = password;    }    #endregion    #region 方法    /// <summary>    /// 下载文件    /// </summary>    /// <param name="filePath"></param>    /// <param name="isOk"></param>    public voID DownLoad(string filePath,out bool isOk) {      string method = WebRequestMethods.Ftp.Downloadfile;      var statusCode = FtpStatusCode.DataAlreadyOpen;      FtpWebResponse response = callFtp(method);      ReadByBytes(filePath,response,statusCode,out isOk);    }    public voID UpLoad(string file,out bool isOk)    {      isOk = false;      fileInfo fi = new fileInfo(file);      fileStream fs = fi.OpenRead();      long length = fs.Length;      string uri = string.Format("ftp://{0}:{1}{2}",this.IpAddr,this.Port,this.RelatePath);      FtpWebRequest request = (FtpWebRequest)WebRequest.Create(uri);      request.Credentials = new NetworkCredential(Username,Password);      request.Method = WebRequestMethods.Ftp.Uploadfile;      request.UseBinary = true;      request.ContentLength = length;      request.Timeout = 10 * 1000;      try      {        Stream stream = request.GetRequestStream();        int BufferLength = 2048; //2K          byte[] b = new byte[BufferLength];        int i;        while ((i = fs.Read(b,BufferLength)) > 0)        {          stream.Write(b,i);        }        stream.Close();        stream.dispose();        isOk = true;      }      catch (Exception ex)      {        Console.Writeline(ex.ToString());      }      finally {        if (request != null)        {          request.Abort();          request = null;        }      }    }    /// <summary>    /// 删除文件    /// </summary>    /// <param name="isOk"></param>    /// <returns></returns>    public string[] Deletefile(out bool isOk) {      string method = WebRequestMethods.Ftp.Deletefile;      var statusCode = FtpStatusCode.fileActionOK;      FtpWebResponse response = callFtp(method);      return ReadByline(response,out isOk);    }    /// <summary>    /// 展示目录    /// </summary>    public string[] ListDirectory(out bool isOk)    {      string method = WebRequestMethods.Ftp.ListDirectoryDetails;      var statusCode = FtpStatusCode.DataAlreadyOpen;      FtpWebResponse response= callFtp(method);      return ReadByline(response,out isOk);    }    /// <summary>    /// 设置上级目录    /// </summary>    public voID SetPrePath()    {      string relatePath = this.RelatePath;      if (string.IsNullOrEmpty(relatePath) || relatePath.LastIndexOf("/") == 0 )      {        relatePath = "";      }      else {        relatePath = relatePath.Substring(0,relatePath.LastIndexOf("/"));      }      this.RelatePath = relatePath;    }    #endregion    #region 私有方法    /// <summary>    /// 调用Ftp,将命令发往Ftp并返回信息    /// </summary>    /// <param name="method">要发往Ftp的命令</param>    /// <returns></returns>    private FtpWebResponse callFtp(string method)    {      string uri = string.Format("ftp://{0}:{1}{2}",this.RelatePath);      FtpWebRequest request; request = (FtpWebRequest)FtpWebRequest.Create(uri);      request.UseBinary = true;      request.UsePassive = true;      request.Credentials = new NetworkCredential(Username,Password);      request.KeepAlive = false;      request.Method = method;      FtpWebResponse response = (FtpWebResponse)request.GetResponse();      return response;    }    /// <summary>    /// 按行读取    /// </summary>    /// <param name="response"></param>    /// <param name="statusCode"></param>    /// <param name="isOk"></param>    /// <returns></returns>    private string[] ReadByline(FtpWebResponse response,FtpStatusCode statusCode,out bool isOk) {      List<string> lstAccpet = new List<string>();      int i = 0;      while (true)      {        if (response.StatusCode == statusCode)        {          using (StreamReader sr = new StreamReader(response.GetResponseStream()))          {            string line = sr.Readline();            while (!string.IsNullOrEmpty(line))            {              lstAccpet.Add(line);              line = sr.Readline();            }          }          isOk = true;          break;        }        i++;        if (i > 10)        {          isOk = false;          break;        }        Thread.Sleep(200);      }      response.Close();      return lstAccpet.ToArray();    }    private voID ReadByBytes(string filePath,FtpWebResponse response,out bool isOk)    {      isOk = false;      int i = 0;      while (true)      {        if (response.StatusCode == statusCode)        {          long length = response.ContentLength;          int bufferSize = 2048;          int readCount;          byte[] buffer = new byte[bufferSize];          using (fileStream outputStream = new fileStream(filePath,fileMode.Create))          {            using (Stream ftpStream = response.GetResponseStream())            {              readCount = ftpStream.Read(buffer,bufferSize);              while (readCount > 0)              {                outputStream.Write(buffer,readCount);                readCount = ftpStream.Read(buffer,bufferSize);              }            }          }          break;        }        i++;        if (i > 10)        {          isOk = false;          break;        }        Thread.Sleep(200);      }      response.Close();    }    #endregion  }  /// <summary>  /// Ftp内容类型枚举  /// </summary>  public enum FtpContentType  {    undefined = 0,file = 1,folder = 2  }}

源码链接如下：案例

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