GetValue requires an indexed object argument because properties can be indexed (for example if I was trying to get an Items property of a listbox control).

GetValue需要一个索引对象参数，因为属性可被索引(例如，当我试图获取Listbox控件的Items属性时)。

youdao

How do you use the tool to select an item from a listbox, when it doesn't know the listbox is there?

而当工具并不知道列表框是否在那里时，又如何让它选择其中的表项呢？

youdao

To accomplish this, create a ListBox widget class similar to the one created earlier for TextField, and then add select() and find() methods to it.

要完成这项操作，需要创建 ListBox 窗口小部件类，创建过程与前面创建 TextField 的相似，然后将 select() 和 find() 方法添加到该类中。

youdao