使用讯息筛选器，在特定事件传递至事件处理常式之前，防止该事件被引发或执行事件的特殊作业。

Use a message filter to prevent specific events from being raised or to perform special operations for an event before it is passed to an event handler.

youdao

使用讯息筛选器，在特定事件传递至事件处理常式之前，防止该事件被引发或执行事件的特殊作业。

Use a message filter to prevent specific events from being raised or to perform special operations for an event before it is passed to an event handler.

youdao