如何使用ftpWebRequest下载Word、Pdf或Excel文件？

using System.Net;
using System.IO;

FtpWebRequest request = (FtpWebRequest)WebRequest.Create("ftp://ftp.example.com/path/to/file.docx");
request.Method = WebRequestMethods.Ftp.DownloadFile;
request.Credentials = new NetworkCredential("username", "password");

FtpWebResponse response = (FtpWebResponse)request.GetResponse();

Stream responseStream = response.GetResponseStream();
FileStream fileStream = new FileStream("local/path/to/save/file.docx", FileMode.Create);

byte[] buffer = new byte[1024];
int bytesRead;
while ((bytesRead = responseStream.Read(buffer, 0, buffer.Length)) > 0)
{
    fileStream.Write(buffer, 0, bytesRead);
}

fileStream.Close();
responseStream.Close();
response.Close();