Version: 2020.3
public static PackageManager.Requests.AddRequest Add (string identifier);


identifier A string representing the package to be added:

- To install a specific version of a package, use a package identifier ("name@version"). This is the only way to install a pre-release version.
- To install the latest compatible (released) version of a package, specify only the package name.
- To install a git package, specify a git url.
- To install a local package, specify a value in the format "file:/path/to/package/folder".
- To install a local tarball package, specify a value in the format "file:/path/to/package-file.tgz".

ArgumentException is thrown if identifier is null or empty.


AddRequest 一个 AddRequest 实例,可用于监控异步操作,并在操作完成时获取结果。


Adds a package dependency to the project. Requesting a new or different dependency often leads to changing installed packages, but only after the Package Manager constructs a dependency graph to solve any version conflicts. For more information, see Dependency and resolution.

注意:在调用此方法之前,需确保其他所有客户端操作均已完成。有关更多信息,请参阅 Client 类参考页中的注意事项。