System classes, for instance, are not modifiable, while user-defined interface classes can be modified, but can't include actual implementation code.

例如，系统类是不可修改的，而用户定义接口类虽然可以修改，但是不能包含实际的实现代码。

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Instrumentation code within service implementation detects and logs system - and application-level exceptions.

服务实现中的工具代码用于检测和记录系统级和应用级异常。

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In the Downloads section, you will find a sample implementation of a continuous build system for Rule Team Server and DVS, using the principles and pieces of code described in this article.

在下载部分，您将找到一个适用于Rule Team Server和DVS的持续构建系统的样例实现，并且可以使用本文介绍的准则和代码片段。

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