如何确保NzTreeFlatDataSource与treeControl.dataNodes数据一致?

Question

 treeControl = new FlatTreeControl<any>(
    node => node.level,
    node => node.expandable
  );

  treeFlattener = new NzTreeFlattener(
    this.transformer,
    node => node.level,
    node => node.expandable,
    node => node.children
  );

  dataSource = new NzTreeFlatDataSource(this.treeControl, this.treeFlattener);

  hasChild = (_: number, node: any): boolean => node.expandable;
ngOnChanges(changes: SimpleChanges) {
this.dataSource.setData(orderList.currentValue);}

updateTreeNode() {
    this.orderList.forEach((item: any) => {
      if (item.itemList) {
        item.itemList.forEach((i: any) => {
          i.key = item.key;
          i.isItem = true;
          i.isCheck = false;
          i.partId = i.defaultPartId;
          i.strengthId = i.defaultStrengthId;
          i.defaultItemId = i.itemId;
        });
      }
      item.children = item.itemList;
    });

    console.log('传入的orderList', this.orderList);
    this.dataSource.setData([...this.orderList]);
    console.log('dataSource', this.dataSource.getData());
    console.log('dataNodes', this.treeControl.dataNodes);
    this.cd.markForCheck();
  }

我初始化树的时候，先将传入的orderList赋值给dataSource，然后我改变了这个orderList的时候，需要修改树视图的dataSource的值，和orderList同步数据，问题是dataSource的_data的值改变了，但treeControl.dataNodes的值还是初始化的值，怎么改变都无效，改怎么做