如何从特定文件夹的ftp​​下载文件

Question

I create a windows form to download files from ftp from particular folder.

The user put the ftp details with username and password and folder name from which file will be download all the files. This will set by user one time and the all file from ftp describe folder will download everyday.
Example on FTP Folder Name is MyFolder where a.docx, b.docx etc it will download a.docx, b.docx everyday not other folder data need to download.

For download and list of file I use below function. Can you please tell me what I am doing mistake or how can I do this .

 private void downloadFileFromFTP()
 {
    try
    {
        string[] files = GetFileList();
        foreach (string file in files)
        {
            Download(file);
        }
    }
    catch (Exception ex)
    {
    }
}

For Get The List of file

public string[] GetFileList()
{
    string[] downloadFiles;
    StringBuilder result = new StringBuilder();
    WebResponse response = null;
    StreamReader reader = null;
    try
    {
        FtpWebRequest reqFTP;
        reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri( "ftp://" + txtftpAddress.Text + "/")); //txtFtpAddress.Text + "/" + txtFTPFolderName + "/" + file
        reqFTP.UseBinary = true;
        reqFTP.Credentials = new NetworkCredential("UserNm", "passwd");
        reqFTP.Method = WebRequestMethods.Ftp .ListDirectory;
        reqFTP.Proxy = null;
        reqFTP.KeepAlive = false;
        reqFTP.UsePassive = false;
        response = reqFTP.GetResponse();
        reader = new StreamReader(response.GetResponseStream());
        string line = reader.ReadLine();
        while (line != null)
        {
            result.Append(line);
            result.Append("\n");
            line = reader.ReadLine();
        }
        // to remove the trailing '\n'
        result.Remove(result.ToString().LastIndexOf('\n'), 1);
        return result.ToString().Split('\n');
    }
    catch (Exception ex)
    {
        if (reader != null)
        {
            reader.Close();
        }
        if (response != null)
        {
            response.Close();
        }
        downloadFiles = null;
        return downloadFiles;
    }
}

download the file form the folder

private void Download(string file)
{                       
    try
    {                             
        string uri = "ftp://" + txtFtpAddress.Text.Trim() + "/" + "txtlodername.Text" + "/" + file;

        Uri serverUri = new Uri(uri);
        if (serverUri.Scheme != Uri.UriSchemeFtp)
        {
            return;
        }       
        FtpWebRequest reqFTP;                
        reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(txtFtpAddress.Text + "/" + txtFTPFolderName + "/" + file));                                
        reqFTP.Credentials = new NetworkCredential("UserName", "mypass");                
        reqFTP.KeepAlive = false;                
        reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;                                
        reqFTP.UseBinary = true;
        reqFTP.Proxy = null;                 
        reqFTP.UsePassive = false;
        FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
        Stream responseStream = response.GetResponseStream();
        FileStream writeStream = new FileStream("D\\Temp"  + file, FileMode.Create);                
        int Length = 2048;
        Byte[] buffer = new Byte[Length];
        int bytesRead = responseStream.Read(buffer, 0, Length);               
        while (bytesRead > 0)
        {
            writeStream.Write(buffer, 0, bytesRead);
            bytesRead = responseStream.Read(buffer, 0, Length);
        }                
        writeStream.Close();
        response.Close(); 
    }
    catch (WebException wEx)
    {
        MessageBox.Show(wEx.Message, "Download Error");
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message, "Download Error");
    }
}

Answer 1

I think 3 lines of your Download method have to be corrected as follows:

1.

string uri = "ftp://" + txtFtpAddress.Text.Trim() + "/" + "txtlodername.Text" + "/" + file;

should be:

string uri = "ftp://" + txtFtpAddress.Text.Trim() + "/" + txtFTPFolderName.Text.Trim() + "/" + file;

2.

reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(txtFtpAddress.Text + "/" + txtFTPFolderName + "/" + file));

should be:

reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));

3.

FileStream writeStream = new FileStream("D\\Temp"  + file, FileMode.Create);  

should be:

FileStream writeStream = new FileStream("D:\\Temp\\"  + file, FileMode.Create);