| packageIdOrName | The name or ID of the package. ArgumentException is thrown if packageIdOrName is null or empty. |
| offlineMode | 指定 Package Manager 是否从远程 Unity 包注册表请求有关项目包的最新信息。当 offlineMode 为 true 时，Package Manager 返回的 PackageInfo 对象包含从本地包缓存获取的信息，这些信息可能已经过时。 |
SearchRequest 一个 SearchRequest 实例，可用于监控异步操作，并在操作完成时获取结果。
搜索 Unity 包注册表以获取给定的包。
This operation issues a request to the official Unity package registry.
Note: Make sure any other Client operations have completed before calling this method. For more information, see the note on the Client class reference page.