System.Security.Cryptography.X509Certificates.X509Extension.CopyFrom C# (CSharp) Method

        public override void CopyFrom(System.Security.Cryptography.AsnEncodedData asnEncodedData)
        {
        }

        internal unsafe X509ExtensionCollection(SafeCertContextHandle safeCertContextHandle)
        {
            using (SafeCertContextHandle certContext = CAPI.CertDuplicateCertificateContext(safeCertContextHandle)) {
                CAPI.CERT_CONTEXT pCertContext = *((CAPI.CERT_CONTEXT *)certContext.DangerousGetHandle());
                CAPI.CERT_INFO    pCertInfo    = (CAPI.CERT_INFO)Marshal.PtrToStructure(pCertContext.pCertInfo, typeof(CAPI.CERT_INFO));
                uint   cExtensions             = pCertInfo.cExtension;
                IntPtr rgExtensions            = pCertInfo.rgExtension;

                for (uint index = 0; index < cExtensions; index++)
                {
                    X509Extension extension       = new X509Extension(new IntPtr((long)rgExtensions + (index * Marshal.SizeOf(typeof(CAPI.CERT_EXTENSION)))));
                    X509Extension customExtension = CryptoConfig.CreateFromName(extension.Oid.Value) as X509Extension;
                    if (customExtension != null)
                    {
                        customExtension.CopyFrom(extension);
                        extension = customExtension;
                    }
                    Add(extension);
                }
            }
        }