导入包分辨率之间的区别:=可选，完全没有依赖性 [英] Difference between Import-Package resolution:=optional and no dependency at all

问题描述

我已阅读此处仔细使用导入包"指令中的可选分辨率，但并不真正理解为什么.另外，可选和根本不指定依赖项之间有什么区别?

I have read here to use the optional resolution within the "Import-Package" directive carefully, but don't really understand why. Also what is the difference between optional and not specifying a dependency at all?

推荐答案

如果根本无法指定Import-Package，则您的包将无法访问包，即使该包可用并由其他包导出了.

If you fail to specify an Import-Package at all, then your bundle cannot access the package even if it available and exported by some other bundle.

如果您有选择地导入软件包，则捆绑软件可以使用它(如果可用)，但是该软件包不可用不会阻止捆绑软件的解决.

If you import the package optionally, then your bundle can use it if available, but that package not being available does not prevent resolution of your bundle.

您应避免在程序包级别使用可选的依赖项.您是否依赖于包装或不依赖于包装.通常，对可选依赖项的需求表明您的包具有较差的一致性，即，它在一个模块内执行了太多无关的事情.

You should avoid optional dependencies at the package level. Either you depend on a package or you don't. Normally a need for optional dependencies indicates that your bundle has poor coherency, i.e. it's doing too many unrelated things within one module.

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