Question

我尝试下载文件，但无法识别所有具有特殊字符的文件。可以下载其他文件，而无法下载名为“asdf＃code @ .pdf”的文件。 Erro：远程服务器返回错误：（550）文件不可用（例如，找不到文件，没有访问权限）。在本地，创建具有正确名称的文件，但它是空的。在文件名中带有“＃”的JPG文件上也会发生同样的事情。我怎么能让他们被认出来？

//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;
        }
    }

Answer 1

此可能设计符合：根据the URI standard，#不是URI中的有效字符。因此，ftp://someServer/somePath/intro_to_c#.pdf 不是有效的URI。

当创建 URI时，您可以做的是正确转义文件名：

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类来正确处理转义：

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

Answer 2

我添加了一些代码并修复了它。使用hexEscape来逃避“＃”，但它并不合适。任何人都有想要转义URI中的特殊字符吗？

    // Get the request using a specific URI 
    static public FtpWebRequest GetWebRequest(string method, string uri)
    {
        Uri serverUri = new Uri(uri);

        **if (serverUri.ToString().Contains("#"))
        {
            serverUri = new Uri(serverUri.ToString().Replace("#", Uri.HexEscape('#')));
        }**
        Console.WriteLine(serverUri.ToString());
        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;
        }
    }

c＃文件名特殊字符

2 个答案: