protected override void OnValidate()

in src/Microsoft.Azure.NotificationHubs/MpnsCredential.cs [182:229]
45 lines of code
12 McCabe index (conditional complexity)

        protected override void OnValidate(bool allowLocalMockPns)
        {
            if (this.Properties == null || this.Properties.Count <= 0)
            {
                return;
            }

            if (this.Properties.Count > 2)
            {
                throw new InvalidDataContractException(SRClient.MpnsRequiredPropertiesError);
            }
            if (this.Properties.Count >= 2)
            {
                if (!string.IsNullOrWhiteSpace(this.MpnsCertificate))
                {
                    try
                    {
                        X509Certificate2 x509Certificate2 = this.CertificateKey == null 
                            ? new X509Certificate2(Convert.FromBase64String(this.MpnsCertificate)) 
                            : new X509Certificate2(Convert.FromBase64String(this.MpnsCertificate), this.CertificateKey);
                        if (!x509Certificate2.HasPrivateKey)
                        {
                            throw new InvalidDataContractException(SRClient.MpnsCertificatePrivatekeyMissing);
                        }

                        if (DateTime.Now > x509Certificate2.NotAfter)
                        {
                            throw new InvalidDataContractException(SRClient.MpnsCertificateExpired);
                        }

                        if (!(DateTime.Now < x509Certificate2.NotBefore))
                        {
                            return;
                        }
                        throw new InvalidDataContractException(SRClient.InvalidMpnsCertificate);
                    }
                    catch (CryptographicException ex)
                    {
                        throw new InvalidDataContractException(string.Format(SRClient.MpnsCertificateError, ex.Message));
                    }
                    catch (FormatException ex)
                    {
                        throw new InvalidDataContractException(string.Format(SRClient.MpnsCertificateError, ex.Message));
                    }
                }
            }
            throw new InvalidDataContractException(SRClient.MpnsInvalidPropeties);
        }