LocalCertificateSelectionCallback Delegate
Assembly: System (in system.dll)
'Declaration Public Delegate Function LocalCertificateSelectionCallback ( _ sender As Object, _ targetHost As String, _ localCertificates As X509CertificateCollection, _ remoteCertificate As X509Certificate, _ acceptableIssuers As String() _ ) As X509Certificate 'Usage Dim instance As New LocalCertificateSelectionCallback(AddressOf HandlerMethod)
/** @delegate */ public delegate X509Certificate LocalCertificateSelectionCallback ( Object sender, String targetHost, X509CertificateCollection localCertificates, X509Certificate remoteCertificate, String[] acceptableIssuers )
JScript supports the use of delegates, but not the declaration of new ones.
Parameters
- sender
An object that contains state information for this validation.
- targetHost
The host server specified by the client.
- localCertificates
An X509CertificateCollection containing local certificates.
- remoteCertificate
The certificate used to authenticate the remote party.
- acceptableIssuers
A String array of certificate issuers acceptable to the remote party.
Return Value
An X509Certificate used for establishing an SSL connection.This delegate is used to construct instances of the SslStream class. The SslStream class is used to help secure information exchanged between a client and server. The client and server use this delegate to select a certificate to be used for authentication.
The following code example demonstrates a method implementation for this delegate.
public static X509Certificate SelectLocalCertificate( object sender, string targetHost, X509CertificateCollection localCertificates, X509Certificate remoteCertificate, string[] acceptableIssuers) { Console.WriteLine("Client is selecting a local certificate."); if (acceptableIssuers != null && acceptableIssuers.Length > 0 && localCertificates != null && localCertificates.Count > 0) { // Use the first certificate that is from an acceptable issuer. foreach (X509Certificate certificate in localCertificates) { string issuer = certificate.Issuer; if (Array.IndexOf(acceptableIssuers, issuer) != -1) return certificate; } } if (localCertificates != null && localCertificates.Count > 0) return localCertificates[0]; return null; }
The following code example demonstrates creating an instance of this delegate.
// Server name must match the host name and the name on the host's certificate. serverName = args[0]; // Create a TCP/IP client socket. TcpClient client = new TcpClient(serverName,80); Console.WriteLine("Client connected."); // Create an SSL stream that will close the client's stream. SslStream sslStream = new SslStream( client.GetStream(), false, new RemoteCertificateValidationCallback (ValidateServerCertificate), new LocalCertificateSelectionCallback(SelectLocalCertificate) );
Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.