Public Event PreviewKeyDown As PreviewKeyDownEventHandler

Dim instance As Control
Dim handler As PreviewKeyDownEventHandler

AddHandler instance.PreviewKeyDown, handler

public event PreviewKeyDownEventHandler PreviewKeyDown

public:
event PreviewKeyDownEventHandler^ PreviewKeyDown {
    void add (PreviewKeyDownEventHandler^ value);
    void remove (PreviewKeyDownEventHandler^ value);
}

/** @event */
public void add_PreviewKeyDown (PreviewKeyDownEventHandler value)

/** @event */
public void remove_PreviewKeyDown (PreviewKeyDownEventHandler value)

JScript 支持使用事件，但不支持进行新的声明。