C#使用FtpClient类连接FTP OVER TLS显示

在C#中，你可以使用`System.Net.FtpClient`类通过FTP-over-SSL（FTPS）安全地连接到FTP服务器。下面是一个简单的示例，展示如何创建一个`FtpClient`实例并设置TLS连接：

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

public class FtpOverTlsExample
{
    static void Main(string[] args)
    {
        // FTP server details
        string host = "your_ftp_host";
        int port = 990; // Standard FTPS port (443 is also possible for SSL/TLS)
        string username = "your_username";
        string password = "your_password";

        try
        {
            // Create an FTP client instance with TLS enabled
            FtpWebRequest request = (FtpWebRequest)WebRequest.Create($"ftps://{host}:{port}/"); // Replace path as needed
            request.Method = WebRequestMethods.Ftp.ListDirectory;
            request.Credentials = new NetworkCredential(username, password);
            request.UseSsl = true; // Enable TLS

            using (FtpWebResponse response = (FtpWebResponse)request.GetResponse())
            {
                Console.WriteLine("Connected to FTPS server:");
                using (StreamReader reader = new StreamReader(response.GetResponseStream()))
                {
                    string directoryListing = reader.ReadToEnd();
                    Console.WriteLine(directoryListing);
                }
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine($"Error: {ex.Message}");
        }
    }
}

在这个例子中，你需要替换`your_ftp_host`, `your_username`, 和 `your_password`为你实际的FTP服务器信息。程序会列出指定路径下的目录内容。