将文件上载到c#net中的FTPS

有谁能提供一个简短的指南，说明如何使用C#中的自签名证书将文件发送到FTPS服务器？我通过SFTP和FTP处理文件传输的速度非常快，但我会放弃FTP。我已经用FtpWebRequest和fluentFtp尝试了几天，我不确定我的代码是错误的还是我在我的机器上配置FTPS的方式，所以我真的很感激这两种方法。下面我提供了我在例外情况下测试过的代码

    public bool Send(string filePath)//webRequest version
    {
        bool isFileUploaded = false;

        try
        {
            FtpWebRequest request = WebRequest.Create($"ftp://{this.DestinationInfo.HostIp}:{this.DestinationInfo.Port}/ftps_test/test.txt") as FtpWebRequest;
            request.Credentials = this.Credentials;              //hostIp is the same machine Ip     // port is 990
            request.EnableSsl = true;
            request.Method = WebRequestMethods.Ftp.UploadFile;

            using (Stream fileStream = File.OpenRead(filePath))
            using (Stream ftpStream = request.GetRequestStream())
            {
                fileStream.CopyTo(ftpStream);
            }
            isFileUploaded = true;
        }
        catch (Exception exception)
        {
            //logging -> exception.Message is "System error" and nothing else
            isFileUploaded = false;
        }

        return isFileUploaded;
    }

    public bool Send(string filePath)// fluentFtp version
    {
        bool isFileUploaded = false;

        try
        {
            FtpClient client = new FtpClient(this.DestinationInfo.HostIp, this.DestinationInfo.UserName, this.DestinationInfo.Password);
                                            //also tried "ftp://{HostIp}"
            client.Port = this.DestinationInfo.Port;//990
            client.ReadTimeout *= 10; //temporary because of timeout
            client.EncryptionMode = FtpEncryptionMode.Implicit;
            client.SslProtocols = SslProtocols.Default;
            client.Connect();
            client.UploadFile(filePath, "test.csv");

            isFileUploaded = true;
        }
        catch (Exception exception)
        {
            //logging -> exception.Message is "According to the validation procedure, the remote certificate is invalid.", but i have not idea why
            isFileUploaded = false;
        }

        return isFileUploaded;
    }

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出于我的目的，我只能使用免费的nugets

我使用的是FluentFTP和以下代码，以及由证书颁发机构签署的证书：

private FtpClient getFtpsClient(System.Uri uri) {
    if (uri.Scheme != "ftps") {
        throw new NotImplementedException("Only ftps is implementent");
    }
    var userInfo = uri.UserInfo.Split(":");
    FtpClient client = new FtpClient(uri.Host, userInfo[0], userInfo[1]);
    client.EncryptionMode = FtpEncryptionMode.Explicit;
    client.SslProtocols = SslProtocols.Tls;
    client.ValidateCertificate += new FtpSslValidation(OnValidateCertificate);
    client.Connect();

    void OnValidateCertificate(FtpClient control, FtpSslValidationEventArgs e) {
        var cert2 = new X509Certificate2(e.Certificate);
        e.Accept = cert2.Verify();
    }
    return client;
}

private void writeFileFtps(System.Uri uri, string fileName, byte[] content)
{
    var ftpsClient = getFtpsClient(uri);
    ftpsClient.Upload(content, uri.LocalPath + "/" + fileName);
    ftpsClient.Disconnect();
}

到目前为止还可以，但是

---

在FluentFTP的常见问题解答中，您可以找到有关使用的信息。

当我将ftPencryOptionMode更改为隐式时，它就开始工作了。你知道这是为什么吗？编辑：当我将FTPS服务器端口更改为990以外的端口时，我可以使用显式模式，但我对正在发生的事情的了解更少。你看到问题了吗？