NuGet 包还原功能特意仅适用于一个特定版本.同一个版本号不同的包，如果缺少版本号较低的包，将不会使用.

The NuGet package restore feature intentionally only works for one specific version. The same package with a different version number will not be used if the package with a lower version is missing.

示例 1

• packages.config 引用 1.0.0.0
• 包源包含 1.0.0.0 和 1.0.0.1
• 1.0.0.0是会自动恢复的版本

• packages.config references 1.0.0.0
• package source contains 1.0.0.0 and 1.0.0.1
• 1.0.0.0 is the version that will automatically be restored

示例 2

• packages.config 引用 1.0.0.0
• 包源仅包含 1.0.0.1
• 不会执行自动恢复，项目不会构建

这种行为是有道理的，否则就无法控制您实际构建的内容.想象一下，在您构建将要发布的版本之前，有人用更新版本的包更新了包源...

This behaviour makes sense as otherwise there is no way to control what you are actually building. Imagine someone updates the package source with a newer version of a package just before you build a release that will get shipped...