运行时的动态主题切换和SystemColors主题。
Dynamic theme switching at runtime as well as SystemColors theme.
根据主题选择的操作需求，实现动态主题选择所需的逻辑可能稍微有所不同。
Depending on the operational requirements of the theme selection, the logic required for implementing dynamic theme selection may vary slightly.
要实现动态主题选择，需要对Portal Server系统作出两处改动。
To implement dynamic theme selection, two changes to the Portal Server system are required.
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