设计器宿主是窗体设计器的核心。
设计器宿主是到设计时环境的挂钩。
The designer host is the hook into the design-time environment.
请注意，站点的构造函数接受设计器宿主实例。
Note that the site's constructor accepts a designer host instance.
最后，将新组件添加到设计器宿主容器中。
Finally, the new component is added to the designer host container.
最后，将新组件添加到设计器宿主容器中。
Finally, the new component is added to the designer host container.
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