在C＃中通過FTP編輯文本文件？

Question

基本上，我想使用以下代碼編輯C＃文件：

var file = new StreamReader("ftp://xxx.xxx.x.x/xxx.txt"); //[ip address/file]
        label1.Text = file.ReadLine();
        file.Close();
        var fw = new StreamWriter("ftp://xxx.xxx.x.x/xxx.txt"); //[ip address/file]
        fw.WriteLine(textBox1.Text);
        fw.Close();

但它不起作用，我該怎么做？

Answer 1

通過FTP編輯文件是：

1. 下載文件
2. 在本地編輯文件（在內存中）
3. 上傳文件

對於步驟1和3，請檢查此項 。

Answer 2

與ftplib庫@ http://ftplib.codeplex.com/相比，FtpWebRequest看起來非常復雜

這是他們的榜樣......

   using (FtpConnection ftp = new FtpConnection("ftpserver", "username", "password"))
   {

   ftp.Open(); /* Open the FTP connection */
   ftp.Login(); /* Login using previously provided credentials */

   if (ftp.DirectoryExists("/incoming")) /* check that a directory exists */
       ftp.SetCurrentDirectory("/incoming"); /* change current directory */

   if (ftp.FileExists("/incoming/file.txt"))  /* check that a file exists */
       ftp.GetFile("/incoming/file.txt", false); /* download /incoming/file.txt as file.txt to current executing directory, overwrite if it exists */

   //do some processing

   try
   {
       ftp.SetCurrentDirectory("/outgoing");
       ftp.PutFile(@"c:\localfile.txt", "file.txt"); /* upload c:\localfile.txt to the current ftp directory as file.txt */
   }
   catch (FtpException e)
   {
       Console.WriteLine(String.Format("FTP Error: {0} {1}", e.ErrorCode, e.Message));
   }

   foreach(var dir in ftp.GetDirectories("/incoming/processed"))
   {
       Console.WriteLine(dir.Name);
       Console.WriteLine(dir.CreationTime);
       foreach (var file in dir.GetFiles())
       {
           Console.WriteLine(file.Name);
           Console.WriteLine(file.LastAccessTime);
       }

Answer 3

查看.NET 4.0中包含的FtpWebRequest類來幫助解決這個問題。

Answer 4

我覺得我遲到了，但是我遇到了和你一樣的問題，在我尋找解決方案之后，我找到了一種方法來進行更改而無需下載和上傳文件。

我的目標是保存程序執行期間所做的所有更改，並在程序啟動時從存儲在FTP服務器中的.txt文件加載這些數據。

這是使用的兩種方法：

public static void Save(ArrayList dataStore)
    {
        WebClient request = new WebClient();
        string url = "ftp://ftpname/directory/" + "file.txt";
        request.Credentials = new NetworkCredential("username", "password");
        Stream postStream = request.OpenWrite(url);

        foreach (Data data in dataStore)
        {
            byte[] writeData = Encoding.ASCII.GetBytes(data + "#");
            postStream.Write(writeData, 0, writeData.Length);
        }
    }

public static ArrayList Load()
    {
        ArrayList dataStore = new ArrayList();

        WebClient request = new WebClient();
        string url = "ftp://ftpname/directory/" + "file.txt";
        request.Credentials = new NetworkCredential("username", "password");

        byte[] newFileData = request.DownloadData(url);
        string fileString = Encoding.UTF8.GetString(newFileData);

        if (fileString == "")
        {
            return dataStore;
        }

        string[] dataString = fileString.Split('#');

        foreach (string data in dataString)
        {
            if (data != "")
            {
                dataStore.Add(data);
            }
        }

        return dataStore;
    }