Throughout the development of our microservices, we heavily leveraged dependency injection. As part of a .NET web application's startup process, you register the individual types that should be part of the inversion of control (IoC) container. Individual classes inject their dependencies as interfaces in their constructor arguments. This allows different concrete implementations to be used depending on the context. For example, an interface for a telemetry client may be utilized throughout the codebase. The concrete implementation in the live-service sends actual telemetry data to a remote endpoint. A mocked implementation is used in unit tests to validate the correct event would be sent at the appropriate time.
之所以把冯道这个人物拎出来，最直观的原因是，我去选取五代十国的任何一位天子，都是一个时间点，但我去选取冯道，他却是一条时间线。他出生在唐朝末年，死于后周显德年间——属于五代十国的最后一个年号。他经历了五代十国的全盛时期。
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Фото: Johan Nilsson / TT / Reuters
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Concept art for the project.