Opc.Ua.Com.Client.ComDaClient.ReadAvailableProperties C# (CSharp) Method

        public DaProperty[] ReadAvailableProperties(string itemId, bool updateCache)
        {
            string methodName = "IOPCItemProperties.QueryAvailableProperties";

            // query for available properties.
            int count = 0;

            IntPtr pPropertyIds  = IntPtr.Zero;
            IntPtr pDescriptions = IntPtr.Zero;
            IntPtr pDataTypes    = IntPtr.Zero;

            try
            {
                IOPCItemProperties server = BeginComCall<IOPCItemProperties>(methodName, true);

                server.QueryAvailableProperties(
                    itemId,
                    out count,
                    out pPropertyIds,
                    out pDescriptions,
                    out pDataTypes);
            }
            catch (Exception e)
            {
                if (ComUtils.IsUnknownError(e, ResultIds.E_FAIL, ResultIds.E_INVALIDARG, ResultIds.E_UNKNOWNITEMID, ResultIds.E_INVALIDITEMID))
                {
                    ComUtils.TraceComError(e, methodName);
                }

                return null;
            }
            finally
            {
                EndComCall(methodName);
            }

            // unmarshal results.
            int[]    propertyIds  = ComUtils.GetInt32s(ref pPropertyIds, count, true);
            string[] descriptions = ComUtils.GetUnicodeStrings(ref pDescriptions, count, true);
            short[]  datatype     = ComUtils.GetInt16s(ref pDataTypes, count, true);

            List<DaProperty> properties = new List<DaProperty>();

            for (int ii = 0; ii < count; ii++)
            {
                // do not return any of the built in properties.
                if (propertyIds[ii] <= PropertyIds.TimeZone)
                {
                    continue;
                }

                DaProperty property = new DaProperty();

                property.PropertyId = propertyIds[ii];
                property.Name = descriptions[ii];
                property.DataType = datatype[ii];

                properties.Add(property);
            }

            // fetch the item ids.
            if (properties.Count > 0)
            {
                DaProperty[] array = properties.ToArray();

                GetPropertyItemIds(itemId, array);

                // update the cache.
                if (updateCache)
                {
                    lock (m_cache)
                    {
                        DaElement element = null;

                        if (m_cache.TryGetValue(itemId, out element))
                        {
                            element.Properties = array;
                        }
                    }
                }

                return array;
            }

            return null;
        }
        #endregion