MongoDB.Bson.Serialization.Serializers.EnumSerializer.VerifySerializeTypes C# (CSharp) Метод

        private void VerifySerializeTypes(Type nominalType, Type actualType)
        {
            // problem is that the actual type of a nullable type that is not null will appear as the non-nullable type
            // we want to allow both Enum and Nullable<Enum> here 
            bool isNullableOfActual = (nominalType.IsGenericType &&
                nominalType.GetGenericTypeDefinition() == typeof(Nullable<>) &&
                nominalType.GetGenericArguments().Single() == actualType);
            if (nominalType != typeof(object) && nominalType != actualType && !isNullableOfActual)
            {
                var message = string.Format("EnumSerializer.Serialize cannot be used with nominal type {0}.", nominalType.FullName);
                throw new BsonSerializationException(message);
            }

            if (!actualType.IsEnum)
            {
                var message = string.Format("EnumSerializer.Serialize cannot be used with actual type {0}.", actualType.FullName);
                throw new BsonSerializationException(message);
            }
        }
    }