/// <summary> /// 节点 Checkbox 状态改变时触发此方法 /// </summary> /// <param name="state"></param> /// <param name="item"></param> /// <returns></returns> private async Task OnStateChanged(CheckboxState state, TreeItem item) { // 向下级联操作 item.CascadeSetCheck(item.Checked); if (OnTreeItemChecked != null) { await OnTreeItemChecked(GetCheckedItems().ToList()); } }