OleViewDotNet.COMRegistryViewer.GetGuidFromType C# (CSharp) Method

        private Guid GetGuidFromType(TreeNode node)
        {
            Guid guid = Guid.Empty;
            if (node != null)
            {
                object tag = node.Tag;
                if (tag is COMCLSIDEntry)
                {
                    guid = ((COMCLSIDEntry)tag).Clsid;
                }
                else if (tag is COMInterfaceEntry)
                {
                    guid = ((COMInterfaceEntry)tag).Iid;
                }
                else if (tag is COMProgIDEntry)
                {
                    COMProgIDEntry ent = (COMProgIDEntry)tag;
                    if (m_reg.MapClsidToEntry(ent.Clsid) != null)
                    {
                        guid = ent.Clsid;
                    }
                }
                else if (tag is COMTypeLibEntry)
                {
                    guid = ((COMTypeLibEntry)tag).TypelibId;
                }
                else if (tag is Guid)
                {
                    guid = (Guid)tag;
                }
                else if (tag is COMAppIDEntry)
                {
                    guid = ((COMAppIDEntry)tag).AppId;
                }
            }

            return guid;
        }