A generic delegate that is called back when an object should publish an instance of a service.

在对象应发布服务实例时回调的泛型委托。

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We simply delegate to these generic providers.

我们只需委托这些通用提供程序就可以了。

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A contravariant delegate can be assigned another delegate of the same type, but with a less derived generic type parameter.

可以向逆变委托分配同一类型的其他委托，但需使用派生程度较小的泛型类型参数。

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