类似地，对于自定义的类，必须使得编译器可以访问和类相关的定义。
Similarly, for our own classes, we must make the definitions associated with the class available to the compiler.
对于自定义控件来说，需要执行其他工作才能确保编程访问能够正确实现。
Custom controls require additional work to ensure that programmatic access is correctly implemented.
在应用程序中，授权和身份验证是基础机制，对于自定义实现，丢弃二者是冒险的选择。
Authorization and authentication are fundamental mechanisms in an application, and discarding both for a custom implementation strikes us as a risky choice.
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