| id | 层级视图项标识符。 |
| outChildren | 使用项的子项标识符填充的列表（作为方法调用的结果）。 |
获取层级视图项的子项的列表。
结果会写入 outChildren 列表，后者在需要时会调整大小。
该列表包含项的子项的标识符，并会对参数排序。
标识符定义当前帧层级视图中的特定树视图项。对于树项，不同帧具有不同标识符。
GetItemChildren 调用会构建下一个层级视图级别，使子项数据可供获取。
另请参阅：TreeViewItem.children。
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