| item | 用于匹配搜索字符串的项。 |
| search | TreeView 的搜索字符串。 |
bool 如果项与搜索字符串匹配，则为 true；否则为 false。
重载此函数可扩展或更改搜索行为。
系统会采用默认的 BuildRow 方法，针对每个 TreeViewItem 自动调用此函数。如果返回 true，则 TreeViewItem 成为搜索结果的一部分。
如果您要重载 BuildRow 并仅构建可见行，则需要自行针对具有所有状态的后端处理搜索。
默认情况下，此函数将搜索字符串与项名称进行匹配。
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