C# FluentFTP類上傳下載文件

　　前言：最近要實現從FTP服務器下載和上傳文件，在網上搜了一下據說 FluentFTP 是個客戶端FTP功能的實現，使用還比較順暢，所以對此展開研究，無奈網上給出的案例並沒有想象中的那么簡潔，所以想着自己搞一個代碼少易讀性高的demo來給需要的小伙伴。話不多說直接上案例，文章結尾會有下載地址。

一、首先我們需要通過 NuGet 導入 FluentFTP 包。

二、編寫上傳和下載部分代碼。

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服務器文件下載到本地
        /// </summary>
        /// <param name="ftphost">ftp地址：ftp://192.168.1.200/</param>
        /// <param name="user">ftp用戶名</param>
        /// <param name="password">ftp密碼</param>
        /// <param name="saveLocalPath">下載到本地的地址：d:\\doctument\\0F5GAHRT4A484TRA5D15FEA.pdf</param>
        /// <param name="downPath">將要下載的文件在FTP上的路徑：/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);//如果文件夾不存在就創建它

                FileStream fs = new FileStream(saveLocalPath, FileMode.Create, FileAccess.ReadWrite, FileShare.ReadWrite);
                fs.Write(outBuffs, 0, outBuffs.Length);
                //清空緩沖區、關閉流
                fs.Flush();
                fs.Close();
            }
        } 

        /// <summary>
        /// 將文件上傳到FTP服務器
        /// </summary>
        /// <param name="ftphost">ftp地址</param>
        /// <param name="user">ftp用戶名</param>
        /// <param name="password">ftp密碼</param>
        /// <param name="localPath">本地文件所在的路徑："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)
            {

            }
        }
    }
}

　　鏈接: https://pan.baidu.com/s/17ACQrZI_90PjMBJ2rRhbwg

　　提取碼: i98j