出现以下情况时提供事件通知：添加和移除根设计器、选定的组件已更改、当前的根设计器已更改。
Provides event notifications when root designers are added and removed, when a selected component changes, and when the current root designer changes.
当您处理项目或解决方案中的不同文件或处理设计器中的不同组件时，选定的项将会更改。
The selected item changes as you work with different files in a project or solution, or different components in a designer.
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