| packageIdOrName | The name or ID of the package. ArgumentException is thrown if packageIdOrName is null or empty. |
| offlineMode | Specifies whether or not the Package Manager requests the latest information about the project's packages from the remote Unity package registry. When offlineMode is true, the PackageInfo object returned by the Package Manager contains information obtained from the local package cache, which could be out of date. |
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.