在C#中，可以使用FTP协议来将数组直接保存到FTP服务器。可以使用System.Net.WebClient类来实现这一功能。以下是一个示例代码：

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

class Program
{
    static void Main()
    {
        string ftpServer = "ftp://ftp.example.com/";
        string username = "username";
        string password = "password";
        string fileName = "array.txt";

        byte[] array = { 1, 2, 3, 4, 5 };

        UploadArrayToFtpServer(ftpServer, username, password, fileName, array);
    }

    static void UploadArrayToFtpServer(string ftpServer, string username, string password, string fileName, byte[] array)
    {
        string ftpPath = $"{ftpServer}/{fileName}";

        using (WebClient client = new WebClient())
        {
            client.Credentials = new NetworkCredential(username, password);
            client.UploadData(ftpPath, "STOR", array);
        }

        Console.WriteL