| id | TreeViewItem ID。 |
IList<int> 具有子项的后代。
返回 ID 为 id 的项的具有子项的所有后代。
此方法用于展开整个子树。系统会自动在一些 TreeView 方法中调用此方法。如果完整项树尚未内置于 BuildRoot() 中，则应重载此方法并使用后端数据查找给定项的正确后代。
默认行为：通过从 rootItem 搜索其所有后代来查找 ID 为 id 的项。找到后，系统会收集该项的具有子项的所有后代。假设已构建完整树。
另请参阅：GetAncestors。
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