Eclipse rcp 如果部分插入ICommandService，工具栏处理的项目图标将消失

我正在零件工具栏中添加工具栏处理项。部件堆栈有一个部件，其bundle类为DataBaseConnectPart。当我注入commandService和IHandlerService时。“零件”工具栏中的按钮将消失。我完全不知道如何在选择树项目时启动命令

public class DatabaseExplorerPart {
@Inject
private IEventBroker eventBroker;

@Inject
private EPartService partService;

@Inject private ICommandService commandService;
@Inject private IHandlerService service;
@Inject private IEvaluationService evaluationService;

@PostConstruct
public void createControls(Composite parent, EMenuService menuService,  EclipseContext context ) {
    createImages();
    viewer = new TreeViewer(parent, SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL);
    viewer.setContentProvider(new ViewContentProvider());
    viewer.addSelectionChangedListener(new ISelectionChangedListener() {
        @Override
        public void selectionChanged(SelectionChangedEvent arg0) {
            TreeSelection ts = (TreeSelection)arg0.getSelection();
            Object o = ts.getFirstElement();
             if (o instanceof Query){
                    context.set(Constants.KEY_SELECTED_OBJECT_TYPE, "query");
                    context.set(Constants.KEY_SELECTED_OBJECT, o);
                    String name = ((Query)o).getName();
                    if(name.equalsIgnoreCase("New Query")){
                      executeCommand();
                      }
                }
            }
        }
    });
    viewer.setLabelProvider(new ViewLabelProvider());
}
 private void executeCommand(){
 try {
  Command theCommand = commandService.getCommand("com.db.connect.command");
  theCommand.executeWithChecks(new ExecutionEvent(theCommand, new HashMap(), null, evaluationService.getCurrentState()));
  } catch (Exception exception) {
    logger.error(exception.getMessage(), exception);
  }
 }

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这是3.x还是e4？e4没有Ixxx服务，注入将在日志中失败。是的，谢谢greg，我将其更改为ECommandService，现在它正确执行。