Microsoft.VisualStudio.Project.FileNode.QueryStatusOnNode C# (CSharp) Method

        protected override int QueryStatusOnNode(Guid cmdGroup, uint cmd, IntPtr pCmdText, ref vsCommandStatus result)
        {
            if(cmdGroup == VsMenus.guidStandardCommandSet97)
            {
                switch((VsCommands)cmd)
                {
                    case VsCommands.Copy:
                    case VsCommands.Paste:
                    case VsCommands.Cut:
                    case VsCommands.Rename:
                        string linkPath = this.ItemNode.GetMetadata(ProjectFileConstants.Link);
                        if (string.IsNullOrEmpty(linkPath))
                        {
                            result |= vsCommandStatus.vsCommandStatusSupported | vsCommandStatus.vsCommandStatusEnabled;
                            return VSConstants.S_OK;
                        }
                        else
                        {
                            // disable these commands on linked items
                            result = vsCommandStatus.vsCommandStatusUnsupported;
                            return VSConstants.S_OK;
                        }

                    case VsCommands.ViewCode:
                        if (this.IsNonmemberItem)
                            result = vsCommandStatus.vsCommandStatusUnsupported;
                        else
                            result |= vsCommandStatus.vsCommandStatusSupported | vsCommandStatus.vsCommandStatusEnabled;

                        return VSConstants.S_OK;

                    //case VsCommands.Delete: goto case VsCommands.OpenWith;
                    case VsCommands.Open:
                    case VsCommands.OpenWith:
                        result |= vsCommandStatus.vsCommandStatusSupported | vsCommandStatus.vsCommandStatusEnabled;
                        return VSConstants.S_OK;
                }
            }
            else if(cmdGroup == VsMenus.guidStandardCommandSet2K)
            {
                if ((VsCommands2K)cmd == VsCommands2K.INCLUDEINPROJECT)
                {
                    // if it is a non member item node, the we support "Include In Project" command
                    if (IsNonmemberItem)
                    {
                        result |= vsCommandStatus.vsCommandStatusSupported | vsCommandStatus.vsCommandStatusEnabled;
                        return VSConstants.S_OK;
                    }
                }
                else if((VsCommands2K)cmd == VsCommands2K.EXCLUDEFROMPROJECT)
                {
                    // if it is a non member item node, then we don't support "Exclude From Project" command
                    if (IsNonmemberItem)
                    {
                        result = vsCommandStatus.vsCommandStatusUnsupported;
                        return VSConstants.S_OK;
                    }

                    string linkPath = this.ItemNode.GetMetadata(ProjectFileConstants.Link);
                    if (string.IsNullOrEmpty(linkPath))
                    {
                        result |= vsCommandStatus.vsCommandStatusSupported | vsCommandStatus.vsCommandStatusEnabled;
                        return VSConstants.S_OK;
                    }
                    else
                    {
                        result = vsCommandStatus.vsCommandStatusUnsupported;
                        return VSConstants.S_OK;
                    }
                }
                if((VsCommands2K)cmd == VsCommands2K.RUNCUSTOMTOOL)
                {
                    if(string.IsNullOrEmpty(this.ItemNode.GetMetadata(ProjectFileConstants.DependentUpon)))
                    {
                        IEnumerable<string> extenderNames = this.NodeProperties.ExtenderNames() as IEnumerable<string>;
                        if (extenderNames != null && extenderNames.Contains(SingleFileGeneratorNodeExtenderProvider.Name)
                            && this.NodeProperties.Extender(SingleFileGeneratorNodeExtenderProvider.Name) != null)
                        {
                            result |= vsCommandStatus.vsCommandStatusSupported | vsCommandStatus.vsCommandStatusEnabled;
                            return VSConstants.S_OK;
                        }
                    }
                }
            }
            else
            {
                return (int)OleConstants.OLECMDERR_E_UNKNOWNGROUP;
            }
            return base.QueryStatusOnNode(cmdGroup, cmd, pCmdText, ref result);
        }