System.Security.Cryptography.X509Certificates.X509Certificate2Collection.Contains C# (CSharp) Method

        public bool Contains(System.Security.Cryptography.X509Certificates.X509Certificate2 certificate)
        {
            throw null;
        }

        internal static bool VerifyWithExtraRoots(
            this X509Chain chain,
            X509Certificate certificate,
            X509Certificate2Collection extraRoots)
        {
            chain.ChainPolicy.ExtraStore.AddRange(extraRoots);
            if (chain.Build(new X509Certificate2(certificate)))
                return true;
            else
            {
                // .NET returns UntrustedRoot status flag if the certificate is not in
                // the SYSTEM trust store. Check if it's the only problem with the chain.
                var onlySystemUntrusted =
                    chain.ChainStatus.Length == 1 &&
                    chain.ChainStatus[0].Status == X509ChainStatusFlags.UntrustedRoot;

                // Sanity check that indeed that is the only problem with the root
                // certificate.
                var rootCert = chain.ChainElements[chain.ChainElements.Count - 1];
                var rootOnlySystemUntrusted =
                    rootCert.ChainElementStatus.Length == 1 &&
                    rootCert.ChainElementStatus[0].Status
                    == X509ChainStatusFlags.UntrustedRoot;

                // Double check it's indeed one of the extra roots we've been given.
                var rootIsUserTrusted = extraRoots.Contains(rootCert.Certificate);

                return
                    onlySystemUntrusted && rootOnlySystemUntrusted && rootIsUserTrusted;
            }
        }