The AddService method is overloaded to create services the first time they are queried.

AddService 方法被重载，以便在第一次查询服务时创建相应的服务。

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This can only be changed in the AddService action, so it is easy to make sure that our cache is accurate.

这只能在 AddService 操作中更改，因此可以很容易地确保缓存的精确性。

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When you put the example SCA application into a debugger and place a breakpoint on the AddService add method, you see a call stack trace similar to Listing 4.

当使用调试器调试示例 SCA 应用程序并在 AddService add 方法上设置断点时，将看到如清单 4 所示的调用堆栈跟踪。

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