C# 委托方法未在C中调用#
我正在尝试调用一个代理来验证从FTP服务器传入的SSL证书 当我在OnCertificateReceived函数中放置调试点时,执行从未停止过,SSL证书也从未验证过 如果我在这里做错了什么,请有人指出。C# 委托方法未在C中调用#,c#,.net,.net-core,delegates,xceed,C#,.net,.net Core,Delegates,Xceed,我正在尝试调用一个代理来验证从FTP服务器传入的SSL证书 当我在OnCertificateReceived函数中放置调试点时,执行从未停止过,SSL证书也从未验证过 如果我在这里做错了什么,请有人指出。 class Program { var hostname = ''; var username = ''; var password = ''; public static void main() { new Program().XceedFtpWithSSL(); } void X
class Program
{
var hostname = '';
var username = '';
var password = '';
public static void main()
{
new Program().XceedFtpWithSSL();
}
void XceedFtpWithSSL()
{
connection = new FtpConnection(hostname,21,username,password,AuthenticationMethod.TlsAuto,VerificationFlags.None,null,DataChannelProtection.Private,false);
connection.CertificateReceived += new CertificateReceivedEventHandler( this.OnCertificateReceived );
}
// When I put debug point in this method, execution never stops
private void OnCertificateReceived(object sender, CertificateReceivedEventArgs e)
{
// The Status argument property tells you if the server certificate was accepted
// based on the VerificationFlags you provided.
if (e.Status != VerificationStatus.ValidCertificate)
{
Console.WriteLine("Do you want to accept this certificate anyway? [Y/N]");
int answer = Console.Read();
if ((answer == 'y') || (answer == 'Y'))
{
e.Action = VerificationAction.Accept;
}
}
else
{
Console.WriteLine("Valid certificate received from server.");
// e.Action's default value is VerificationAction.Accept
}
} // End of Delegate
}//End of class
然后,您将向委托应用一个事件,为了让他执行defato,FtpConnection中必须有一些函数来执行此委托事件:Ex
public delegate void ExDelegate(string value);
class Program
{
static void Main(string[] args)
{
Connection connection = new Connection();
connection.ExDelegate += OnConnection_ExDelegate;
connection.Init();
}
public static void OnConnection_ExDelegate(string value)
{
Console.WriteLine(value);
Console.ReadLine();
}
}
public class Connection
{
public event ExDelegate ExDelegate;
public void Init()
{
Console.Write("Enter your name: ");
ExDelegate?.Invoke(Console.ReadLine());
}
}
我猜你真的需要做点什么来让这个班打开一个连接。您是否尝试调用
TestConnection()
方法来验证连接是否可行?@Prasoon:您是说OnCertificateReceived
从不执行?或者它执行后挂起?是的,它从不执行,我指的是Xceed的文档,其中他们首先初始化连接,然后调用委托来验证证书。文档说明它初始化一个新实例,而不是连接。我认为当您实际尝试使用FtpFile
或FtpFolder
执行某些操作时,可能会发生连接尝试。正如我前面所说的,调用TestConnection()
方法,查看它是否导致执行OnCertificateReceived
。Xceed文档中的证书验证示例使用FtpClient
接口。您正在使用“文件系统”界面。文档没有说明当您使用“显式TLS”时,FtpConnection::TestConnection
是否协商TLS,而是说它“检查连接是否可行”。这可能仅仅意味着打开一个套接字,甚至不发送/接收welcom消息。尝试实际执行一项操作,例如列出文件夹()中的所有文件。看看会发生什么。