增益集的主检视为抽象基底类别或介面，会描述主机和增益集使用的方法，如合约中所指定。
The host view of the add-in is the abstract base class or interface that describes the methods used by the host and the add-in, as specified in the contract.
告知设计主应用程式，由提供的矩形表示的区域需要在设计介面上重新绘制。
Notifies the design host that the area represented by the provided rectangle needs to be repainted on the design surface.
告知设计主应用程式，由提供的矩形表示的区域需要在设计介面上重新绘制。
Notifies the design host that the area represented by the provided rectangle needs to be repainted on the design surface.
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