C#FluentFTP类上传下载文件

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　　前言：最近要实现从FTP服务器下载和上传文件，在网上搜了一下据说 FluentFTP 是个客户端FTP功能的实现，使用还比较顺畅，所以对此展开研究，无奈网上给出的案例并没有想象中的那么简洁，所以想着自己搞一个代码少易读性高的demo来给需要的小伙伴。话不多说直接上案例，文章结尾会有下载地址。

一、首先我们需要通过 NuGet 导入 FluentFTP 包。

二、编写上传和下载部分代码。

using FluentFTP;
using System;
using System.IO;
using System.Net;

namespace FluentFTPDemo
{
    class Program
    {
        static void Main(string[] args)
        {
            UploadFile("ftp://192.168.1.200/", "test", "test", "d:\\doctument\\test.pdf");
            DownloadFile("ftp://192.168.1.200/", "test", "test", "d:\\doctument\\0bc600ee-b36a-4344-b82d-5e23b9de771c.pdf", "/Files/0bc600ee-b36a-4344-b82d-5e23b9de771c");

            Console.ReadLine();
        }

        /// <summary>
        /// FTP服务器文件下载到本地
        /// </summary>
        /// <param name="ftphost">ftp地址：ftp://192.168.1.200/</param>
        /// <param name="user">ftp用户名</param>
        /// <param name="password">ftp密码</param>
        /// <param name="saveLocalPath">下载到本地的地址：d:\\doctument\\0F5GAHRT4A484TRA5D15FEA.pdf</param>
        /// <param name="downPath">将要下载的文件在FTP上的路径：/DownFile/0F5GAHRT4A484TRA5D15FEA</param>
        static void DownloadFile(string ftphost, string user, string password, string saveLocalPath, string downPath)
        {
            using (FtpClient conn = new FtpClient())
            {
                conn.Host = ftphost;
                conn.Credentials = new NetworkCredential(user, password);

                byte[] outBuffs;
                bool flag = conn.Download(out outBuffs, downPath);

                string s = saveLocalPath.Substring(0, saveLocalPath.LastIndexOf('\\'));
                Directory.CreateDirectory(s);//如果文件夹不存在就创建它

                FileStream fs = new FileStream(saveLocalPath, FileMode.Create, FileAccess.ReadWrite, FileShare.ReadWrite);
                fs.Write(outBuffs, 0, outBuffs.Length);
                //清空缓冲区、关闭流
                fs.Flush();
                fs.Close();
            }
        } 

        /// <summary>
        /// 将文件上传到FTP服务器
        /// </summary>
        /// <param name="ftphost">ftp地址</param>
        /// <param name="user">ftp用户名</param>
        /// <param name="password">ftp密码</param>
        /// <param name="localPath">本地文件所在的路径："D:\doctument\test.pdf"</param>
        static void UploadFile(string ftphost, string user, string password, string localPath)
        {
            try
            {
                using (FtpClient conn = new FtpClient())
                {
                    conn.Host = ftphost;
                    conn.Credentials = new NetworkCredential(user, password);
                    using (FileStream fs = new FileStream(localPath, FileMode.Open))
                    {
                        string path = localPath.Substring(localPath.LastIndexOf('\\') + 1);       //取文件名
                        bool flag = conn.Upload(fs, path);
                    }
                }
            }
            catch (Exception ex)
            {

            }
        }
    }
}