namespace System.Security.Cryptography.X509Certificates
{
    [DefaultMember("Item")]
    public class X509Certificate2Collection : X509CertificateCollection, IEnumerable, IEnumerable<X509Certificate2!>
    {
        [UnsupportedOSPlatform("ios")]
        [UnsupportedOSPlatform("tvos")]
        public bool TryExportPkcs7Pem(Span<char> destination, out int charsWritten);
    }
}