CHasClientCertificate Method

Example

This example demonstrates how to use obsolete methods to check for a client certificate. Note that this is for illustrative purposes only and should not be used in new code.

using System;
using System.Net;
using System.Net.Security;

public class Example
{
    public static void Main(string[] args)
    {
        // This code uses obsolete members and is for demonstration only.
        // Do not use this approach in new applications.

        // In a real scenario, you would have an ICertificatePolicy instance.
        // For demonstration, we'll use a mock or null if not applicable.
        ICertificatePolicy policy = null; // Replace with your actual policy if available

        try
        {
            // This method is obsolete and will throw ObsoleteException
            // if called directly in newer .NET versions or if the feature is truly removed.
            // For older .NET Framework versions, it might return a value but is still deprecated.
            bool hasCertificate = CHasClientCertificate(policy);

            if (hasCertificate)
            {
                Console.WriteLine("A client certificate is available.");
            }
            else
            {
                Console.WriteLine("No client certificate is available.");
            }
        }
        catch (ObsoleteException)
        {
            Console.WriteLine("CHasClientCertificate method is obsolete and cannot be used.");
            Console.WriteLine("Use SslClientAuthenticationOptions.RemoteCertificateValidationCallback or SslServerAuthenticationOptions.RemoteCertificateValidationCallback instead.");
        }
        catch (Exception ex)
        {
            Console.WriteLine($"An error occurred: {ex.Message}");
        }
    }

    // Dummy implementation of CHasClientCertificate for compilation purposes in this example context,
    // but the actual runtime behavior in .NET Framework would be to use the framework's implementation.
    // This is to avoid compiler errors if the actual method isn't found.
    // In a real scenario, you would rely on the System.Net.Security namespace.
    [Obsolete("This method is obsolete. Do not use it.", true)]
    public static bool CHasClientCertificate(ICertificatePolicy certificatePolicy)
    {
        // This method is obsolete and should not be implemented directly.
        // The actual implementation in older .NET Framework versions would have logic here.
        // For this example, we throw the expected exception.
        throw new ObsoleteException("This method is obsolete. Do not use it.");
    }
}