AoMBrgEditor.PssgFile.AddNode C# (CSharp) Метод

        public PssgNode AddNode(PssgNode parentNode, int nodeID)
        {
            if (rootNode == null)
            {
                PssgNode newRootNode = new PssgNode(nodeID, this, null, nodeInfo[nodeID - 1].isDataNode);
                rootNode = newRootNode;
                return newRootNode;
            }
            if (parentNode.isDataNode == true)
            {
                MessageBox.Show("Adding sub nodes to a data node is not allowed!", "Add Node", MessageBoxButtons.OK, MessageBoxIcon.Stop);
                return null;
            }
            if (parentNode.subNodes != null)
            {
                Array.Resize(ref parentNode.subNodes, parentNode.subNodes.Length + 1);
            }
            else
            {
                parentNode.subNodes = new PssgNode[1];
            }
            PssgNode newNode = new PssgNode(nodeID, this, parentNode, nodeInfo[nodeID - 1].isDataNode);
            parentNode.subNodes[parentNode.subNodes.Length - 1] = newNode;
            return newNode;
        }