C# 从 FTP 服务器下载名称包含特殊字符的文件

我尝试下载文件，但所有具有特殊字符的文件都无法识别。可以下载其他文件，文件名为asdf#[email protected] /cdn-cgi/l/email-protection无法下载。

Error:

远程服务器返回错误：(550) 文件不可用（例如，未找到文件、无法访问）。

在本地，创建了名称正确的文件，但它是空的。 JPG 文件也会发生同样的情况#文件名里面。我怎样才能让他们被认可呢？

//Download the file from remote path on FTP to local path
private static void Download(string remotePath, string localPath)
{
    FtpWebRequest reqFTP;
    try
    {
        reqFTP = GetWebRequest(WebRequestMethods.Ftp.DownloadFile, remotePath);
        FileStream outputStream = new FileStream(localPath, FileMode.Create);

        FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
        Stream ftpStream = response.GetResponseStream();
        long cl = response.ContentLength;
        int bufferSize = 2048;
        int readCount;
        byte[] buffer = new byte[bufferSize];
        readCount = ftpStream.Read(buffer, 0, bufferSize);
        while (readCount > 0)
        {
            outputStream.Write(buffer, 0, readCount);
            readCount = ftpStream.Read(buffer, 0, bufferSize);
        }
        ftpStream.Close();
        outputStream.Close();
        response.Close();
        Console.WriteLine("File Download: ", remotePath + " is downloaded completely");
        logWriter.WriteLog("File Download: ", remotePath + " is downloaded completely, status " + response.StatusDescription);
    }
    catch (Exception ex)
    {
        logWriter.WriteLog("File Download: ", "Cannot download file from " + remotePath + " to " + localPath + "\n" + " Erro Message: " + ex.Message);
    }
}//End Download

//Web request for FTP
static public FtpWebRequest GetWebRequest(string method, string uri)
{
    Uri serverUri = new Uri(uri);

    if (serverUri.Scheme != Uri.UriSchemeFtp)
    {
        return null;
    }
    try
    {
        var reqFTP = (FtpWebRequest)FtpWebRequest.Create(serverUri);
        reqFTP.Method = method;
        reqFTP.UseBinary = true;
        reqFTP.Credentials = new NetworkCredential(userId, password);
        reqFTP.Proxy = null;
        reqFTP.KeepAlive = false;
        reqFTP.UsePassive = false;
        return reqFTP;
    }
    catch(Exception ex)
    {
        logWriter.WriteLog("Get Web Request: ","Cannot connect to " + uri + "\n" + "Error: " + ex.Message);
        return null;
    }
}

This might设计使然：根据URI标准 http://www.ietf.org/rfc/rfc2396.txt, #不是 URI 中的有效字符。因此，ftp://someServer/somePath/intro_to_c#.pdf is not有效的 URI。

您可以做的是在以下情况下正确转义文件名creatingURI：

string baseUri = "ftp://someServer/somePath/";
string file = "intro_to_c#.pdf";
string myUri = baseUri + HttpUtility.UrlEncode(file);
// yields ftp://someServer/somePath/intro_to_c%23.pdf

或者，您可以使用 UriBuilder 类，它可以正确处理转义：

Uri myUri = new UriBuilder("ftp", "someServer", 21, "somePath/intro_to_c#.pdf");
// yields ftp://someServer:21/somePath/intro_to_c%23.pdf